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INVESTMENT SECURITIES - AMORTIZED COST, UNREALIZED GAINS AND LOSSES AND FAIR VALUE BY MAJOR CLASSIFICATION (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Securities available for sale:    
Amortized Cost $ 958,257 $ 694,511
Gross Unrealized Gains 10,648 2,196
Gross Unrealized Losses 2,945 7,575
Investment securities available for sale, at fair value 965,960 689,132 [1]
GSE obligations    
Securities available for sale:    
Amortized Cost 17,595 5,980
Gross Unrealized Gains 120 3
Gross Unrealized Losses 0 1
Investment securities available for sale, at fair value 17,715 5,982
SBA-guaranteed securities    
Securities available for sale:    
Amortized Cost 18,125 12,114
Gross Unrealized Gains 207 74
Gross Unrealized Losses 11 12
Investment securities available for sale, at fair value 18,321 12,176
Mortgage-backed securities issued by GSEs    
Securities available for sale:    
Amortized Cost 529,554 440,654
Gross Unrealized Gains 5,905 887
Gross Unrealized Losses 868 5,916
Investment securities available for sale, at fair value 534,591 435,625
Municipal bonds    
Securities available for sale:    
Amortized Cost 129,300 55,402
Gross Unrealized Gains 2,061 504
Gross Unrealized Losses 163 106
Investment securities available for sale, at fair value 131,198 55,800
Securities held to maturity:    
Amortized Cost 38,847  
Gross Unrealized Gains 1,834  
Gross Unrealized Losses 0  
Investment securities held to maturity, fair value 40,681  
Corporate bonds    
Securities available for sale:    
Amortized Cost 184,954 123,669
Gross Unrealized Gains 1,996 551
Gross Unrealized Losses 1,118 688
Investment securities available for sale, at fair value 185,832 123,532
Securities held to maturity:    
Amortized Cost   39,182
Gross Unrealized Gains   1,318
Gross Unrealized Losses   0
Investment securities held to maturity, fair value   40,500
Collateralized loan obligations    
Securities available for sale:    
Amortized Cost 50,511 50,538
Gross Unrealized Gains 94 0
Gross Unrealized Losses 76 55
Investment securities available for sale, at fair value 50,529 50,483
Non-agency RMBS    
Securities available for sale:    
Amortized Cost   3,528
Gross Unrealized Gains   144
Gross Unrealized Losses   9
Investment securities available for sale, at fair value   3,663
Non-agency CMBS    
Securities available for sale:    
Amortized Cost 16,366  
Gross Unrealized Gains 36  
Gross Unrealized Losses 42  
Investment securities available for sale, at fair value 16,360  
Certificates of deposit    
Securities available for sale:    
Amortized Cost 743 245
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Investment securities available for sale, at fair value 743 245
Equity securities    
Securities available for sale:    
Amortized Cost 11,109 2,381
Gross Unrealized Gains 229 33
Gross Unrealized Losses 667 788
Investment securities available for sale, at fair value $ 10,671 $ 1,626
[1] Derived from the audited consolidated financial statements included in the Company's 2015 Annual Report on Form 10-K.