DEPOSITS - Time Deposits by Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deposit Liabilities [Abstract]
Within one year	$ 483,649
After one but within two years	161,360
After two but within three years	38,039
After three but within four years	28,941
After four but within five years	44,895
Total	$ 756,884	$ 678,394