FEDERAL HOME LOAN BANK ADVANCES (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Contractual Maturity, Amount
Overnight	$ 43,000	$ 175,000
2017	420,905	294,113
2018	25,344	25,431
2019	1,928	2,140
Total FHLB advances except overnight advances	448,177	321,684
Total FHLB advances	$ 491,177	$ 496,684
Weighted Average Rate
Overnight (as a percent)	1.00%	0.74%
2017 (as a percent)	0.98%	0.82%
2018 (as a percent)	1.06%	1.05%
2019 (as a percent)	1.02%	1.04%
Weighted Average Rate for total FHLB advances except overnight advances (as a percent)	0.99%	0.84%
Weighted Average Rate for total FHLB advances (as a percent)	0.99%	0.80%