LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of changes in ALLL by portfolio segment - As percent of ALLL (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
ALLL:        
Individually evaluated    
Collectively evaluated 11,820 10,307    
Ending balance 11,820 10,307 $ 9,288 $ 9,232
Loans:        
Individually evaluated 19,217 3,566    
Collectively evaluated 1,549,690 873,495    
Total loans 1,568,907 877,061    
Less ALLL 11,820 10,307 9,288 $ 9,232
Net loans 1,557,087 866,754    
Retail & other        
ALLL:        
Individually evaluated    
Collectively evaluated 152 74    
Ending balance 152 74 49  
Loans:        
Individually evaluated    
Collectively evaluated 14,515 6,513    
Total loans 14,515 6,513    
Less ALLL 152 74 49  
Net loans 14,363 6,439    
Commercial Portfolio Segment | Commercial & industrial        
ALLL:        
Individually evaluated    
Collectively evaluated 3,919 3,721    
Ending balance 3,919 3,721    
Loans:        
Individually evaluated 338 142    
Collectively evaluated 427,932 294,277    
Total loans 428,270 294,419    
Less ALLL 3,919 3,721    
Net loans 424,351 290,698    
Commercial Portfolio Segment | Owner-occupied CRE        
ALLL:        
Individually evaluated    
Collectively evaluated 2,867 1,933    
Ending balance 2,867 1,933    
Loans:        
Individually evaluated 2,588 950    
Collectively evaluated 357,639 185,285    
Total loans 360,227 185,285    
Less ALLL 2,867 1,933    
Net loans 357,360 183,352    
Commercial Portfolio Segment | AG Production        
ALLL:        
Individually evaluated    
Collectively evaluated 150 85    
Ending balance 150 85 53  
Loans:        
Individually evaluated 41 39    
Collectively evaluated 34,726 14,979    
Total loans 34,767 15,018    
Less ALLL 150 85 53  
Net loans 34,617 14,933    
Commercial Real Estate Portfolio Segment | AG real estate        
ALLL:        
Individually evaluated    
Collectively evaluated 285 380    
Ending balance 285 380 226  
Loans:        
Individually evaluated 240 252    
Collectively evaluated 44,994 43,020    
Total loans 45,234 43,272    
Less ALLL 285 380 226  
Net loans 44,949 42,892    
Commercial Real Estate Portfolio Segment | CRE investment        
ALLL:        
Individually evaluated    
Collectively evaluated 1,124 785    
Ending balance 1,124 785 511  
Loans:        
Individually evaluated 12,552 1,301    
Collectively evaluated 183,327 77,410    
Total loans 195,879 78,711    
Less ALLL 1,124 785 511  
Net loans 194,755 77,926    
Commercial Real Estate Portfolio Segment | Construction & land development        
ALLL:        
Individually evaluated    
Collectively evaluated 774 1,446    
Ending balance 774 1,446 2,685  
Loans:        
Individually evaluated 694 280    
Collectively evaluated 74,294 36,495    
Total loans 74,988 36,775    
Less ALLL 774 1,446 2,685  
Net loans 74,214 35,329    
Residential | First mortgage        
ALLL:        
Individually evaluated    
Collectively evaluated 1,784 1,240    
Ending balance 1,784 1,240 866  
Loans:        
Individually evaluated 2,204 460    
Collectively evaluated 298,100 154,198    
Total loans 300,304 154,658    
Less ALLL 1,784 1,240 866  
Net loans 298,520 153,418    
Residential | Junior mortgage        
ALLL:        
Individually evaluated    
Collectively evaluated 461 496    
Ending balance 461 496 337  
Loans:        
Individually evaluated 299 142    
Collectively evaluated 91,032 51,825    
Total loans 91,331 51,967    
Less ALLL 461 496 337  
Net loans 90,870 51,471    
Residential | Residential construction        
ALLL:        
Individually evaluated    
Collectively evaluated 304 147    
Ending balance 304 147 140  
Loans:        
Individually evaluated 261    
Collectively evaluated 23,131 10,443    
Total loans 23,392 10,443    
Less ALLL 304 147 140  
Net loans 23,088 10,296    
Originated        
ALLL:        
Individually evaluated    
Collectively evaluated 9,449 8,714    
Ending balance 9,449 8,714 9,288  
Loans:        
Individually evaluated 387    
Collectively evaluated 901,987 739,748    
Total loans 901,987 740,135    
Less ALLL 9,449 8,714 9,288  
Net loans 892,538 731,421    
Originated | Owner-occupied CRE        
ALLL:        
Ending balance 2,263 1,567    
Loans:        
Less ALLL 2,263 1,567    
Originated | Retail & other        
ALLL:        
Individually evaluated    
Collectively evaluated 132 63    
Ending balance 132 63 49  
Loans:        
Individually evaluated    
Collectively evaluated 10,095 6,351    
Total loans 10,095 6,351    
Less ALLL 132 63 49  
Net loans 9,963 6,288    
Originated | Commercial Portfolio Segment | Commercial & industrial        
ALLL:        
Individually evaluated    
Collectively evaluated 3,150 3,135    
Ending balance 3,150 3,135    
Loans:        
Individually evaluated    
Collectively evaluated 330,073 284,023    
Total loans 330,073 284,023    
Less ALLL 3,150 3,135    
Net loans 326,923 280,888    
Originated | Commercial Portfolio Segment | Owner-occupied CRE        
ALLL:        
Individually evaluated    
Collectively evaluated 2,263 1,567    
Ending balance 2,263 1,567    
Loans:        
Individually evaluated    
Collectively evaluated 182,776 153,563    
Total loans 182,776 153,563    
Less ALLL 2,263 1,567    
Net loans 180,513 151,996    
Originated | Commercial Portfolio Segment | AG Production        
ALLL:        
Individually evaluated    
Collectively evaluated 122 71    
Ending balance 122 71 53  
Loans:        
Individually evaluated    
Collectively evaluated 9,192 6,849    
Total loans 9,192 6,849    
Less ALLL 122 71 53  
Net loans 9,070 6,778    
Originated | Commercial Real Estate Portfolio Segment | AG real estate        
ALLL:        
Individually evaluated    
Collectively evaluated 222 299    
Ending balance 222 299 226  
Loans:        
Individually evaluated    
Collectively evaluated 18,858 25,464    
Total loans 18,858 25,464    
Less ALLL 222 299 226  
Net loans 18,636 25,165    
Originated | Commercial Real Estate Portfolio Segment | CRE investment        
ALLL:        
Individually evaluated    
Collectively evaluated 893 646    
Ending balance 893 646 511  
Loans:        
Individually evaluated 387    
Collectively evaluated 72,930 58,562    
Total loans 72,930 58,949    
Less ALLL 893 646 511  
Net loans 72,037 58,303    
Originated | Commercial Real Estate Portfolio Segment | Construction & land development        
ALLL:        
Individually evaluated    
Collectively evaluated 656 1,381    
Ending balance 656 1,381 2,685  
Loans:        
Individually evaluated    
Collectively evaluated 44,147 27,231    
Total loans 44,147 27,231    
Less ALLL 656 1,381 2,685  
Net loans 43,491 25,850    
Originated | Residential | First mortgage        
ALLL:        
Individually evaluated    
Collectively evaluated 1,372 987    
Ending balance 1,372 987 866  
Loans:        
Individually evaluated    
Collectively evaluated 164,949 122,373    
Total loans 164,949 122,373    
Less ALLL 1,372 987 866  
Net loans 163,577 121,386    
Originated | Residential | Junior mortgage        
ALLL:        
Individually evaluated    
Collectively evaluated 373 418    
Ending balance 373 418 337  
Loans:        
Individually evaluated    
Collectively evaluated 48,199 44,889    
Total loans 48,199 44,889    
Less ALLL 373 418 337  
Net loans 47,826 44,471    
Originated | Residential | Residential construction        
ALLL:        
Individually evaluated    
Collectively evaluated 266 147    
Ending balance 266 147 140  
Loans:        
Individually evaluated    
Collectively evaluated 20,768 10,443    
Total loans 20,768 10,443    
Less ALLL 266 147 140  
Net loans 20,502 10,296    
Acquired        
ALLL:        
Ending balance 2,371 1,593  
Loans:        
Individually evaluated 19,217 3,179    
Collectively evaluated 647,703 133,747    
Total loans 666,920 136,926    
Less ALLL 2,371 1,593  
Net loans 664,549 135,333    
Acquired | Owner-occupied CRE        
ALLL:        
Ending balance 604 366    
Loans:        
Less ALLL 604 366    
Acquired | Retail & other        
ALLL:        
Ending balance 20 11  
Loans:        
Individually evaluated    
Collectively evaluated 4,420 162    
Total loans 4,420 162    
Less ALLL 20 11  
Net loans 4,400 151    
Acquired | Commercial Portfolio Segment | Commercial & industrial        
ALLL:        
Ending balance 769 586    
Loans:        
Individually evaluated 338 142    
Collectively evaluated 97,859 10,254    
Total loans 98,197 10,396    
Less ALLL 769 586    
Net loans 97,428 9,810    
Acquired | Commercial Portfolio Segment | Owner-occupied CRE        
ALLL:        
Ending balance 604 366    
Loans:        
Individually evaluated 2,588 950    
Collectively evaluated 174,863 30,772    
Total loans 177,451 31,722    
Less ALLL 604 366    
Net loans 176,847 31,356    
Acquired | Commercial Portfolio Segment | AG Production        
ALLL:        
Ending balance 28 14  
Loans:        
Individually evaluated 41 39    
Collectively evaluated 25,534 8,130    
Total loans 25,575 8,169    
Less ALLL 28 14  
Net loans 25,547 8,155    
Acquired | Commercial Real Estate Portfolio Segment | AG real estate        
ALLL:        
Ending balance 63 81  
Loans:        
Individually evaluated 240 252    
Collectively evaluated 26,136 17,556    
Total loans 26,376 17,808    
Less ALLL 63 81  
Net loans 26,313 17,727    
Acquired | Commercial Real Estate Portfolio Segment | CRE investment        
ALLL:        
Ending balance 231 139  
Loans:        
Individually evaluated 12,552 914    
Collectively evaluated 110,397 18,848    
Total loans 122,949 19,762    
Less ALLL 231 139  
Net loans 122,718 19,623    
Acquired | Commercial Real Estate Portfolio Segment | Construction & land development        
ALLL:        
Ending balance 118 65  
Loans:        
Individually evaluated 694 280    
Collectively evaluated 30,147 9,264    
Total loans 30,841 9,544    
Less ALLL 118 65  
Net loans 30,723 9,479    
Acquired | Residential | First mortgage        
ALLL:        
Ending balance 412 253  
Loans:        
Individually evaluated 2,204 460    
Collectively evaluated 133,151 31,825    
Total loans 135,355 32,285    
Less ALLL 412 253  
Net loans 134,943 32,032    
Acquired | Residential | Junior mortgage        
ALLL:        
Ending balance 88 78  
Loans:        
Individually evaluated 299 142    
Collectively evaluated 42,833 6,936    
Total loans 43,132 7,078    
Less ALLL 88 78  
Net loans 43,044 7,000    
Acquired | Residential | Residential construction        
ALLL:        
Ending balance 38  
Loans:        
Individually evaluated 261    
Collectively evaluated 2,363    
Total loans 2,624    
Less ALLL 38  
Net loans $ 2,586