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Loans Receivable and Allowance for Loan Losses - Allowance for Loans, by Portfolio Segment and Impairment Method (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($) loan	Jun. 30, 2016 USD ($) loan	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	11	11
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 136,555	$ 136,555		$ 138,090
Specific allowance	$ 8,734	$ 8,734		$ 8,807
Loss coverage ratio	6.40%	6.40%		6.40%
Non-impaired loans	$ 6,450,861	$ 6,450,861		$ 6,113,281
General allowance	$ 67,691	$ 67,691		$ 67,601
Loss coverage ratio	1.00%	1.00%		1.10%
Total loans outstanding	$ 6,587,416	$ 6,587,416		$ 6,251,371
Allowance for loan losses - Total	$ 76,425	$ 76,425	$ 76,856	$ 76,408	$ 70,118	$ 69,594	$ 67,758
Loss coverage ratio	1.20%	1.20%		1.20%
Real estate
Loans by Portfolio Segment and Impairment Method [Abstract]
Total loans outstanding	$ 5,331,015	$ 5,331,015		$ 5,069,482
Real estate | Residential
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	0	0		0
Specific allowance	0	0		0
Non-impaired loans	39,403	39,403		33,797
General allowance	$ 136	$ 136		$ 230
Loss coverage ratio	0.30%	0.30%		0.70%
Total loans outstanding	$ 39,403	$ 39,403		$ 33,797
Allowance for loan losses - Total	$ 136	$ 136		$ 230
Loss coverage ratio	0.30%	0.30%		0.70%
Real estate | Commercial & industrial
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 75,198	$ 75,198		$ 81,117
Specific allowance	$ 1,995	$ 1,995		$ 1,888
Loss coverage ratio	2.70%	2.70%		2.30%
Non-impaired loans	$ 5,083,702	$ 5,083,702		$ 4,831,538
General allowance	$ 52,983	$ 52,983		$ 52,617
Loss coverage ratio	1.00%	1.00%		1.10%
Total loans outstanding	$ 5,158,900	$ 5,158,900		$ 4,912,655
Allowance for loan losses - Total	$ 54,978	$ 54,978		$ 54,505
Loss coverage ratio	1.10%	1.10%		1.10%
Real estate | Construction
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 1,300	$ 1,300		$ 1,369
Specific allowance	$ 0	$ 0		$ 0
Loss coverage ratio	0.00%	0.00%		0.00%
Non-impaired loans	$ 131,412	$ 131,412		$ 121,661
General allowance	$ 1,159	$ 1,159		$ 917
Loss coverage ratio	0.90%	0.90%		0.80%
Total loans outstanding	$ 132,712	$ 132,712		$ 123,030
Allowance for loan losses - Total	$ 1,159	$ 1,159		$ 917
Loss coverage ratio	0.90%	0.90%		0.70%
Commercial business
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 49,900	$ 49,900		$ 41,586
Specific allowance	$ 5,148	$ 5,148		$ 4,316
Loss coverage ratio	10.30%	10.30%		10.40%
Non-impaired loans	$ 977,294	$ 977,294		$ 938,567
General allowance	$ 11,576	$ 11,576		$ 12,231
Loss coverage ratio	1.20%	1.20%		1.30%
Total loans outstanding	$ 1,027,194	$ 1,027,194		$ 980,153
Allowance for loan losses - Total	$ 16,724	$ 16,724		$ 16,547
Loss coverage ratio	1.60%	1.60%		1.70%
Trade finance
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 8,942	$ 8,942		$ 12,548
Specific allowance	$ 1,522	$ 1,522		$ 2,603
Loss coverage ratio	17.00%	17.00%		20.70%
Non-impaired loans	$ 75,083	$ 75,083		$ 86,615
General allowance	$ 927	$ 927		$ 989
Loss coverage ratio	1.20%	1.20%		1.10%
Total loans outstanding	$ 84,025	$ 84,025		$ 99,163
Allowance for loan losses - Total	$ 2,449	$ 2,449		$ 3,592
Loss coverage ratio	2.90%	2.90%		3.60%
Consumer and other
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 1,215	$ 1,215		$ 1,470
Specific allowance	$ 69	$ 69		$ 0
Loss coverage ratio	5.70%	5.70%		0.00%
Non-impaired loans	$ 143,967	$ 143,967		$ 101,103
General allowance	$ 910	$ 910		$ 617
Loss coverage ratio	0.60%	0.60%		0.60%
Total loans outstanding	$ 145,182	$ 145,182		$ 102,573
Allowance for loan losses - Total	$ 979	$ 979		$ 617
Loss coverage ratio	0.70%	0.70%		0.60%
Acquired
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1	1
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	$ 196	$ 196		$ 353
Total loans outstanding	287,999	287,999		373,757
Acquired | Real estate
Loans by Portfolio Segment and Impairment Method [Abstract]
Total loans outstanding	218,835	218,835		288,806
Allowance for loan losses - Total	12,607	12,607	12,626	12,823	13,991	13,724	8,573
Acquired | Real estate | Residential
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	0	0		0
Total loans outstanding	545	545		789
Acquired | Real estate | Construction
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	0	0		0
Total loans outstanding	$ 0	$ 0		0
Acquired | Commercial business
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	$ 96	$ 96		128
Total loans outstanding	32,288	32,288		43,760
Allowance for loan losses - Total	$ 148	$ 148	154	214	500	422	485
Acquired | Trade finance
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	$ 0	$ 0		0
Total loans outstanding	0	0		0
Allowance for loan losses - Total	0	0	0	0	0	0	0
Acquired | Consumer and other
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	0	0		0
Total loans outstanding	36,876	36,876		41,191
Allowance for loan losses - Total	$ 53	$ 53	$ 60	$ 62	$ 64	$ 51	$ 56

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