COMMITMENTS AND CONTINGENCIES AND FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
COMMITMENTS AND CONTINGENCIES AND FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK
Commitments to extend credit, variable interest rate	$ 678,314	$ 726,277
Commitments to extend credit, fixed interest rate	128,884	105,359
Total	807,198	831,636
Standby letters of credit	$ 28,057	$ 31,729