OFF-BALANCE SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Litigation (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Financial instruments with off-balance sheet risk
1 year or less	$ 267,950
More than 1 year but less than 3 years	175,614
3 years or more but less than 5 years	64,002
5 years or more	67,557
Total	575,123
Commitments to extend credit
Financial instruments with off-balance sheet risk
1 year or less	257,333
More than 1 year but less than 3 years	175,075
3 years or more but less than 5 years	63,902
5 years or more	66,917
Total	563,227
Standby and commercial letters of credit
Financial instruments with off-balance sheet risk
1 year or less	10,617
More than 1 year but less than 3 years	539
3 years or more but less than 5 years	100
5 years or more	640
Total	$ 11,896