Loans (Details 3) - USD ($)
$ in Thousands
Feb. 28, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]          
Total loans   $ 337,100 $ 306,771 $ 286,146  
Construction and Land Development [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   33,862 31,150   $ 31,150
Residential [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   6,770 5,202    
Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   27,092 25,948    
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   133,099 116,218   116,218
Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   66,021 69,256    
Non-Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   57,944 38,037    
Multifamily [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   8,824 8,537    
Farmland [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   310 388    
Consumer Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   81,250 83,594   83,594
Home equity lines [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   20,691 20,333    
First Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   54,791 56,776    
Second Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   5,768 6,485    
Commercial and industrial loans (except those secured by real estate) [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   39,390 20,086    
Guaranteed student loans [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   47,398 53,989    
Consumer And Other [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   2,101 1,734    
Risk Rated 1-4 [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   319,778 288,129    
Risk Rated 1-4 [Member] | Construction and Land Development [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   32,112 29,255    
Risk Rated 1-4 [Member] | Residential [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   6,770 5,202    
Risk Rated 1-4 [Member] | Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   25,342 24,053    
Risk Rated 1-4 [Member] | Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   125,676 108,873    
Risk Rated 1-4 [Member] | Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   58,788 64,261    
Risk Rated 1-4 [Member] | Non-Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   57,944 35,887    
Risk Rated 1-4 [Member] | Multifamily [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   8,634 8,337    
Risk Rated 1-4 [Member] | Farmland [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   310 388    
Risk Rated 1-4 [Member] | Consumer Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   74,548 75,490    
Risk Rated 1-4 [Member] | Home equity lines [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   19,501 18,539    
Risk Rated 1-4 [Member] | First Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   49,648 51,200    
Risk Rated 1-4 [Member] | Second Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   5,399 5,751    
Risk Rated 1-4 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   39,390 18,873    
Risk Rated 1-4 [Member] | Guaranteed student loans [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   46,009 53,989    
Risk Rated 1-4 [Member] | Consumer And Other [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   2,043 1,649    
Risk Rated 5 [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   9,653 9,385    
Risk Rated 5 [Member] | Construction and Land Development [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   1,648 572    
Risk Rated 5 [Member] | Residential [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 5 [Member] | Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   1,648 572    
Risk Rated 5 [Member] | Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   3,755 5,105    
Risk Rated 5 [Member] | Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   3,565 2,850    
Risk Rated 5 [Member] | Non-Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 2,055    
Risk Rated 5 [Member] | Multifamily [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   190 200    
Risk Rated 5 [Member] | Farmland [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 5 [Member] | Consumer Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   3,459 3,273    
Risk Rated 5 [Member] | Home equity lines [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   487 435    
Risk Rated 5 [Member] | First Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   2,847 2,710    
Risk Rated 5 [Member] | Second Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   125 128    
Risk Rated 5 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 373    
Risk Rated 5 [Member] | Guaranteed student loans [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   739 0    
Risk Rated 5 [Member] | Consumer And Other [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   52 62    
Risk Rate 6 [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   7,669 9,257    
Risk Rate 6 [Member] | Construction and Land Development [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   102 1,323    
Risk Rate 6 [Member] | Residential [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rate 6 [Member] | Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   102 1,323    
Risk Rate 6 [Member] | Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   3,668 2,240    
Risk Rate 6 [Member] | Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   3,668 2,145    
Risk Rate 6 [Member] | Non-Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 95    
Risk Rate 6 [Member] | Multifamily [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rate 6 [Member] | Farmland [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rate 6 [Member] | Consumer Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   3,243 4,831    
Risk Rate 6 [Member] | Home equity lines [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   703 1,359    
Risk Rate 6 [Member] | First Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   2,296 2,866    
Risk Rate 6 [Member] | Second Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   244 606    
Risk Rate 6 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 840    
Risk Rate 6 [Member] | Guaranteed student loans [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   650 0    
Risk Rate 6 [Member] | Consumer And Other [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   6 23    
Risk Rated 7 [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Construction and Land Development [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Residential [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans     0    
Risk Rated 7 [Member] | Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Non-Owner Occupied [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Multifamily [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Farmland [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Consumer Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0     $ 0
Risk Rated 7 [Member] | Home equity lines [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans $ 0 0      
Risk Rated 7 [Member] | First Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Second Deed of Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans     0    
Risk Rated 7 [Member] | Guaranteed student loans [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   0 0    
Risk Rated 7 [Member] | Consumer And Other [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Total loans   $ 0 $ 0