FEDERAL HOME LOAN BANK ADVANCES (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Contractual Maturity, Amount
Overnight	$ 227,000	$ 185,000
2018	292,014	315,083
2019	1,078	1,291
Total FHLB advances except overnight advances	293,092	316,374
Total FHLB advances	$ 520,092	$ 501,374
Weighted Average Rate
Overnight (as a percent)	2.00%	1.53%
2018 (as a percent)	2.03%	1.59%
2019 (as a percent)	0.88%	0.94%
Weighted Average Rate for total FHLB advances except overnight advances (as a percent)	2.02%	1.59%
Weighted Average Rate for total FHLB advances (as a percent)	2.01%	1.57%