INVESTMENT SECURITIES - Summary of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Securities available for sale:
Amortized Cost	$ 1,006,892	$ 694,511
Gross Unrealized Gains	1,650	2,196
Gross Unrealized Losses	17,929	7,575
Fair Value	990,613	689,132
GSE obligations
Securities available for sale:
Amortized Cost	17,597	5,980
Gross Unrealized Gains	14	3
Gross Unrealized Losses	110	1
Fair Value	17,501	5,982
SBA-guaranteed securities
Securities available for sale:
Amortized Cost	28,189	12,114
Gross Unrealized Gains	39	74
Gross Unrealized Losses	667	12
Fair Value	27,561	12,176
Mortgage-backed securities issued by GSE
Securities available for sale:
Amortized Cost	608,320	440,654
Gross Unrealized Gains	486	887
Gross Unrealized Losses	11,796	5,916
Fair Value	597,010	435,625
Municipal bonds
Securities available for sale:
Amortized Cost	128,931	55,402
Gross Unrealized Gains	201	504
Gross Unrealized Losses	3,585	106
Fair Value	125,547	55,800
Securities held to maturity:
Amortized Cost	38,735	39,182
Gross Unrealized Gains	725	1,318
Gross Unrealized Losses	0	0
Fair Value	39,460	40,500
Corporate bonds
Securities available for sale:
Amortized Cost	153,744	123,669
Gross Unrealized Gains	740	551
Gross Unrealized Losses	1,269	688
Fair Value	153,215	123,532
Collateralized loan obligations
Securities available for sale:
Amortized Cost	45,466	50,538
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	55
Fair Value	45,466	50,483
Non-agency RMBS
Securities available for sale:
Amortized Cost	15,471	3,528
Gross Unrealized Gains	7	144
Gross Unrealized Losses	84	9
Fair Value	15,394	3,663
Other debt securities
Securities available for sale:
Amortized Cost	245	245
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	245	245
Marketable equity securities
Securities available for sale:
Amortized Cost	8,929	2,381
Gross Unrealized Gains	163	33
Gross Unrealized Losses	418	788
Fair Value	$ 8,674	$ 1,626

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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