INVESTMENT SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Securities available for sale:
Less Than 12 Months, Fair Value	$ 313,649	$ 176,385
Less Than 12 Months, Unrealized Losses	3,992	1,340
12 Months or More, Fair Value	121,742	195,463
12 Months or More, Unrealized Losses	3,583	3,217
Total Fair Value	435,391	371,848
Total Unrealized Losses	7,575	4,557
GSE obligations
Securities available for sale:
Less Than 12 Months, Fair Value	999
Less Than 12 Months, Unrealized Losses	1
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total Fair Value	999
Total Unrealized Losses	1
SBA-guaranteed securities
Securities available for sale:
Less Than 12 Months, Fair Value	5,043	94
Less Than 12 Months, Unrealized Losses	12	1
12 Months or More, Fair Value	0	41,950
12 Months or More, Unrealized Losses	0	371
Total Fair Value	5,043	42,044
Total Unrealized Losses	12	372
Mortgage-backed securities issued by GSE
Securities available for sale:
Less Than 12 Months, Fair Value	208,620	152,186
Less Than 12 Months, Unrealized Losses	2,453	1,117
12 Months or More, Fair Value	117,144	149,746
12 Months or More, Unrealized Losses	3,463	2,762
Total Fair Value	325,764	301,932
Total Unrealized Losses	5,916	3,879
Municipal bonds
Securities available for sale:
Less Than 12 Months, Fair Value	8,995	1,953
Less Than 12 Months, Unrealized Losses	106	4
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	8,995	1,953
Total Unrealized Losses	106	4
Corporate bonds
Securities available for sale:
Less Than 12 Months, Fair Value	43,110	18,123
Less Than 12 Months, Unrealized Losses	577	64
12 Months or More, Fair Value	3,697	3,767
12 Months or More, Unrealized Losses	111	84
Total Fair Value	46,807	21,890
Total Unrealized Losses	688	148
Collateralized loan obligations
Securities available for sale:
Less Than 12 Months, Fair Value	45,471
Less Than 12 Months, Unrealized Losses	55
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total Fair Value	45,471
Total Unrealized Losses	55
Non-agency RMBS
Securities available for sale:
Less Than 12 Months, Fair Value	0	1,318
Less Than 12 Months, Unrealized Losses	0	1
12 Months or More, Fair Value	901	0
12 Months or More, Unrealized Losses	9	0
Total Fair Value	901	1,318
Total Unrealized Losses	9	1
Marketable equity securities
Securities available for sale:
Less Than 12 Months, Fair Value	1,411	2,711
Less Than 12 Months, Unrealized Losses	788	153
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	1,411	2,711
Total Unrealized Losses	$ 788	$ 153