SECURITIES PURCHASED UNDER RESALE AGREEMENTS AND SOLD UNDER REPURCHASE AGREEMENTS (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amount of securities sold under repurchase agreements
Gross repurchase agreements	$ 450,000	$ 450,000
Weighted average interest rates (as a percent)	3.15%	2.60%
Repurchase agreements’ extinguishment costs	$ 0	$ 21,818	$ 0
Maturities in 2022 and thereafter
Amount of securities sold under repurchase agreements
Gross repurchase agreements	$ 450,000
Repurchase Agreements
Amount of securities sold under repurchase agreements
Repurchase agreements extinguished		$ 545,000