INVESTMENT AND MORTGAGE-BACKED SECURITIES, Reconciliation of Pre-Tax OTTI Charges Recognized (Details) - Pooled Bank Trust Preferred Securities ("TRUPS") [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OTTI Credit and Non-Credit Losses Recognized in Earnings and AOCI [Roll Forward]
Cumulative pre-tax balance at the beginning of the period	$ 9,295	$ 9,514
Amortization of previously recognized OTTI	(34)	(158)
Cumulative pre-tax balance at end of the period	9,261	9,356
Credit Related OTTI [Member]
OTTI Credit and Non-Credit Losses Recognized in Earnings and AOCI [Roll Forward]
Cumulative pre-tax balance at the beginning of the period	8,717	8,945
Amortization of previously recognized OTTI	(26)	(150)
Cumulative pre-tax balance at end of the period	8,691	8,795
Non-Credit Related OTTI [Member]
OTTI Credit and Non-Credit Losses Recognized in Earnings and AOCI [Roll Forward]
Cumulative pre-tax balance at the beginning of the period	578	569
Amortization of previously recognized OTTI	(8)	(8)
Cumulative pre-tax balance at end of the period	$ 570	$ 561