LOANS AND ALLOWANCE FOR LOAN LOSSES - Nonaccrual loans by portfolio segment (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 20,285 $ 3,533
% to Non Accrual Total 100.00% 100.00%
Retail & other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans
% to Non Accrual Total
Commercial Portfolio Segment | Commercial & industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 358 $ 204
% to Non Accrual Total 1.80% 5.80%
Commercial Portfolio Segment | Owner-occupied CRE    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 2,894 $ 951
% to Non Accrual Total 14.30% 26.90%
Commercial Portfolio Segment | AG Production    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 9 $ 13
% to Non Accrual Total 0.10% 0.40%
Commercial Real Estate Portfolio Segment | AG real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 208 $ 230
% to Non Accrual Total 1.00% 6.50%
Commercial Real Estate Portfolio Segment | CRE investment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 12,317 $ 1,040
% to Non Accrual Total 60.60% 29.40%
Commercial Real Estate Portfolio Segment | Construction & land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 1,193 $ 280
% to Non Accrual Total 5.90% 7.90%
Residential | First mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 2,990 $ 674
% to Non Accrual Total 14.70% 19.10%
Residential | Junior mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 56 $ 141
% to Non Accrual Total 0.30% 4.00%
Residential | Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 260
% to Non Accrual Total 1.30%
Originated    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 257 $ 581
% to Non Accrual Total 100.00% 100.00%
Originated | Retail & other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans
% to Non Accrual Total
Originated | Commercial Portfolio Segment | Commercial & industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 4 $ 49
% to Non Accrual Total 1.60% 8.40%
Originated | Commercial Portfolio Segment | Owner-occupied CRE    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 42
% to Non Accrual Total 16.30%
Originated | Commercial Portfolio Segment | AG Production    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 7 $ 13
% to Non Accrual Total 2.70% 2.20%
Originated | Commercial Real Estate Portfolio Segment | AG real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans
% to Non Accrual Total
Originated | Commercial Real Estate Portfolio Segment | CRE investment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 387
% to Non Accrual Total 66.70%
Originated | Commercial Real Estate Portfolio Segment | Construction & land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans
% to Non Accrual Total
Originated | Residential | First mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 204 $ 132
% to Non Accrual Total 79.40% 22.70%
Originated | Residential | Junior mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans
% to Non Accrual Total
Originated | Residential | Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans
% to Non Accrual Total
Acquired    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 20,028 $ 2,952
% to Non Accrual Total 100.00% 100.00%
Acquired | Retail & other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans
% to Non Accrual Total
Acquired | Commercial Portfolio Segment | Commercial & industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 354 $ 155
% to Non Accrual Total 1.80% 5.30%
Acquired | Commercial Portfolio Segment | Owner-occupied CRE    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 2,852 $ 951
% to Non Accrual Total 14.20% 32.10%
Acquired | Commercial Portfolio Segment | AG Production    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 2
% to Non Accrual Total 0.10%
Acquired | Commercial Real Estate Portfolio Segment | AG real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 208 $ 230
% to Non Accrual Total 1.00% 7.80%
Acquired | Commercial Real Estate Portfolio Segment | CRE investment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 12,317 $ 653
% to Non Accrual Total 61.40% 22.10%
Acquired | Commercial Real Estate Portfolio Segment | Construction & land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 1,193 $ 280
% to Non Accrual Total 6.00% 9.50%
Acquired | Residential | First mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 2,786 $ 542
% to Non Accrual Total 13.90% 18.40%
Acquired | Residential | Junior mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 56 $ 141
% to Non Accrual Total 0.30% 4.80%
Acquired | Residential | Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 260
% to Non Accrual Total 1.30%