Loans (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due $ 13,723 $ 18,654    
Current 323,377 288,117    
Total loans 337,100 306,771 $ 286,146  
Recorded Investment, 90 Days and Accruing 8,174 8,590    
Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 3,501 8,410    
Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 2,048 1,654    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 8,174 8,590    
Construction and Land Development [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Current 33,862 31,150    
Total loans 33,862 31,150   $ 31,150
Recorded Investment, 90 Days and Accruing 0 0    
Construction and Land Development [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Construction and Land Development [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Construction and Land Development [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Residential [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Current 6,770 5,202    
Total loans 6,770 5,202    
Recorded Investment, 90 Days and Accruing 0 0    
Residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Commercial [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Current 27,092 25,948    
Total loans 27,092 25,948    
Recorded Investment, 90 Days and Accruing 0 0    
Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Commercial Real Estate [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 190 437    
Current 132,909 115,781    
Total loans 133,099 116,218   116,218
Recorded Investment, 90 Days and Accruing 0 0    
Commercial Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 190 327    
Commercial Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 110    
Commercial Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Owner Occupied [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 327    
Current 66,021 68,929    
Total loans 66,021 69,256    
Recorded Investment, 90 Days and Accruing 0 0    
Owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 327    
Owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Non-Owner Occupied [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 110    
Current 57,944 37,927    
Total loans 57,944 38,037    
Recorded Investment, 90 Days and Accruing 0 0    
Non-Owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Non-Owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 110    
Non-Owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Multifamily [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 190 0    
Current 8,634 8,537    
Total loans 8,824 8,537    
Recorded Investment, 90 Days and Accruing 0 0    
Multifamily [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 190 0    
Multifamily [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Multifamily [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Farmland [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Current 310 388    
Total loans 310 388    
Recorded Investment, 90 Days and Accruing 0 0    
Farmland [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Farmland [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Farmland [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Consumer Real Estate [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 605 549    
Current 80,645 83,045    
Total loans 81,250 83,594   $ 83,594
Recorded Investment, 90 Days and Accruing 0 0    
Consumer Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 542 257    
Consumer Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 63 292    
Consumer Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Home equity lines [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Current 20,691 20,333    
Total loans 20,691 20,333    
Recorded Investment, 90 Days and Accruing 0 0    
Home equity lines [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Home equity lines [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Home equity lines [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
First Deed of Trust [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 477 455    
Current 54,314 56,321    
Total loans 54,791 56,776    
Recorded Investment, 90 Days and Accruing 0 0    
First Deed of Trust [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 414 163    
First Deed of Trust [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 63 292    
First Deed of Trust [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Second Deed of Trust [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 128 94    
Current 5,640 6,391    
Total loans 5,768 6,485    
Recorded Investment, 90 Days and Accruing 0 0    
Second Deed of Trust [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 128 94    
Second Deed of Trust [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Second Deed of Trust [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Commercial and industrial loans (except those secured by real estate) [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 77 0    
Current 39,313 20,086    
Total loans 39,390 20,086    
Recorded Investment, 90 Days and Accruing 0 0    
Commercial and industrial loans (except those secured by real estate) [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 15 0    
Commercial and industrial loans (except those secured by real estate) [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 62 0    
Commercial and industrial loans (except those secured by real estate) [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Guaranteed student loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 12,840 17,658    
Current 34,558 36,331    
Total loans 47,398 53,989    
Recorded Investment, 90 Days and Accruing 8,174 8,590    
Guaranteed student loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 2,743 7,816    
Guaranteed student loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 1,923 1,252    
Guaranteed student loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 8,174 8,590    
Consumer And Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 11 10    
Current 2,090 1,724    
Total loans 2,101 1,734    
Recorded Investment, 90 Days and Accruing 0 0    
Consumer And Other [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 11 10    
Consumer And Other [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due 0 0    
Consumer And Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financing Receivable, Recorded Investment, Past Due $ 0 $ 0