COMMITMENTS AND CONTINGENCIES, INCLUDING FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
COMMITMENTS AND CONTINGENCIES, INCLUDING FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK
Commitments to extend credit, variable	$ 665,082	$ 626,441
Commitments to extend credit, fixed	63,396	61,608
Total	728,478	688,049
Standby letters of credit	$ 26,136	$ 28,977