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Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructurings on Financing Receivables (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 77,797	$ 72,235
Number of modified contracts | loan	8
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 13,317
Post-Modification	$ 8,654
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	9
Balance	$ 3,063
Specific reserves	2,059
Specific reserves for the TDRs	144
Charge offs	30
Specific reserves allocated to TDRs	7,900	5,700
Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	18,250	18,280
Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	45,586	38,210
Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	13,961	15,745
Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	52,760	47,984
TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	11,870	11,979
TDR on accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	33,795	27,512
TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	7,095	8,493
TDR on accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	25,037	24,251
TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,380	6,301
TDR on non-accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	11,791	10,698
TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,866	7,252
TDR on non-accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 0	0
Commercial & industrial | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured		$ 22,828
Number of modified contracts | loan	22	24
Real estate | Mixed use
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1
Real estate | Commercial & industrial | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 21,709	$ 22,828
Real estate | Commercial & industrial | TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	11,515	11,604
Real estate | Commercial & industrial | TDR on accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	3,500	4,009
Real estate | Commercial & industrial | TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,694	7,215
Real estate | Commercial & industrial | TDR on accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Real estate | Commercial & industrial | TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	12,041	11,919
Real estate | Commercial & industrial | TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	3,773	3,891
Real estate | Commercial & industrial | TDR on non-accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	2,018	1,583
Real estate | Commercial & industrial | TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,250	6,445
Real estate | Commercial & industrial | TDR on non-accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Commercial business | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 24,285	$ 19,845
Number of modified contracts | loan	26	28
Commercial business | TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 355	$ 375
Commercial business | TDR on accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	23,529	18,192
Commercial business | TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	401	1,278
Commercial business | TDR on accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Commercial business | TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	10,561	9,869
Commercial business | TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	2,607	2,410
Commercial business | TDR on non-accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	7,501	6,818
Commercial business | TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	453	641
Commercial business | TDR on non-accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Trade Finance and Other | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,766	5,311
Trade Finance and Other | TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Trade Finance and Other | TDR on accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,766	5,311
Trade Finance and Other | TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Trade Finance and Other | TDR on accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Trade Finance and Other | TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	2,435	2,463
Trade Finance and Other | TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Trade Finance and Other | TDR on non-accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	2,272	2,297
Trade Finance and Other | TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	163	166
Trade Finance and Other | TDR on non-accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Consumer and other | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 6,766	$ 5,311
Number of modified contracts | loan	6	4
Legacy
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	7
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 13,287
Post-Modification	$ 8,625
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	8
Balance	$ 3,001
Legacy | Real estate
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Legacy | Real estate | Payment concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	2
Balance	$ 249
Legacy | Real estate | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	2
Balance	$ 729
Legacy | Real estate | Retail
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Balance	$ 0
Legacy | Real estate | Hotel & motel
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Legacy | Real estate | Gas station & car wash
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	2
Balance	$ 729
Legacy | Real estate | Mixed use
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Legacy | Real estate | Industrial & warehouse
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Balance	$ 0
Legacy | Real estate | Other
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Balance	$ 0
Legacy | Commercial business
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	6
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 11,088
Post-Modification	$ 7,039
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	6
Balance	$ 2,272
Legacy | Commercial business | Payment concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	4
Balance	$ 2,022
Legacy | Trade finance
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 2,199
Post-Modification	$ 1,586
Legacy | Consumer and other
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Acquired
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 30
Post-Modification	$ 29
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1
Balance	$ 62
Charge offs	$ 0
Acquired | Real estate
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Acquired | Real estate | Retail
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Balance	$ 0
Acquired | Real estate | Hotel & motel
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Balance	$ 0
Acquired | Real estate | Gas station & car wash
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Balance	$ 0
Acquired | Real estate | Mixed use
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	62,000
Acquired | Real estate | Industrial & warehouse
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Balance	$ 0
Acquired | Real estate | Other
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Balance	$ 0
Acquired | Commercial business
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Balance	$ 0
Acquired | Trade finance
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0
Post-Modification	$ 0
Acquired | Consumer and other
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 30
Post-Modification	$ 29

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