FEDERAL HOME LOAN BANK ADVANCES (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Contractual Maturity, Amount
Overnight	$ 197,000	$ 175,000
2017	340,000	294,113
2018	25,257	25,431
2019	1,717	2,140
Total FHLB advances except overnight advances	366,974	321,684
Total FHLB advances	$ 563,974	$ 496,684
Weighted Average Rate
Overnight (as a percent)	1.24%	0.74%
2017 (as a percent)	1.31%	0.82%
2018 (as a percent)	1.06%	1.05%
2019 (as a percent)	1.00%	1.04%
Weighted Average Rate for total FHLB advances except overnight advances (as a percent)	1.29%	0.84%
Weighted Average Rate for total FHLB advances (as a percent)	1.27%	0.80%