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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
	Mar. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	9
Positive or Negative Qualitative Adjustment of the Loss Migration Ratio or Individual Specific Reserve Allocations, In Basis Points	0.50%
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 140,424	$ 138,090
Specific allowance	$ 9,884	$ 8,807
Loss coverage ratio	7.00%	6.40%
Non-impaired loans	$ 6,234,577	$ 6,113,281
General allowance	$ 66,972	$ 67,601
Loss coverage ratio	1.10%	1.10%
Total loans outstanding	$ 6,375,001	$ 6,251,371
Allowance for loan losses - Total	$ 76,856	$ 76,408	$ 69,594	$ 67,758
Loss coverage ratio	1.20%	1.20%
Real estate
Loans by Portfolio Segment and Impairment Method [Abstract]
Total loans outstanding	$ 5,132,517	$ 5,069,482
Real estate | Residential
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	0	0
Specific allowance	0	0
Non-impaired loans	32,390	33,797
General allowance	$ 221	$ 230
Loss coverage ratio	0.70%	0.70%
Total loans outstanding	$ 32,390	$ 33,797
Allowance for loan losses - Total	$ 221	$ 230
Loss coverage ratio	0.70%	0.70%
Real estate | Commercial & industrial
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 81,964	$ 81,117
Specific allowance	$ 1,968	$ 1,888
Loss coverage ratio	2.40%	2.30%
Non-impaired loans	$ 4,875,787	$ 4,831,538
General allowance	$ 51,498	$ 52,617
Loss coverage ratio	1.10%	1.10%
Total loans outstanding	$ 4,957,751	$ 4,912,655
Allowance for loan losses - Total	$ 53,466	$ 54,505
Loss coverage ratio	1.10%	1.10%
Real estate | Construction
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 1,342	$ 1,369
Specific allowance	0	$ 0
Loss coverage ratio		0.00%
Non-impaired loans	141,034	$ 121,661
General allowance	$ 1,054	$ 917
Loss coverage ratio	0.70%	0.80%
Total loans outstanding	$ 142,376	$ 123,030
Allowance for loan losses - Total	$ 1,054	$ 917
Loss coverage ratio	0.70%	0.70%
Commercial business
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 47,796	$ 41,586
Specific allowance	$ 6,609	$ 4,316
Loss coverage ratio	13.80%	10.40%
Non-impaired loans	$ 984,282	$ 938,567
General allowance	$ 12,593	$ 12,231
Loss coverage ratio	1.30%	1.30%
Total loans outstanding	$ 1,032,078	$ 980,153
Allowance for loan losses - Total	$ 19,202	$ 16,547
Loss coverage ratio	1.90%	1.70%
Trade finance
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 8,081	$ 12,548
Specific allowance	$ 1,307	$ 2,603
Loss coverage ratio	16.20%	20.70%
Non-impaired loans	$ 78,261	$ 86,615
General allowance	$ 778	$ 989
Loss coverage ratio	1.00%	1.10%
Total loans outstanding	$ 86,342	$ 99,163
Allowance for loan losses - Total	$ 2,085	$ 3,592
Loss coverage ratio	2.40%	3.60%
Consumer and other
Loans by Portfolio Segment and Impairment Method [Abstract]
Impaired loans (gross carrying value)	$ 1,241	$ 1,470
Specific allowance	$ 0	$ 0
Loss coverage ratio	0.00%	0.00%
Non-impaired loans	$ 122,823	$ 101,103
General allowance	$ 828	$ 617
Loss coverage ratio	0.70%	0.60%
Total loans outstanding	$ 124,064	$ 102,573
Allowance for loan losses - Total	$ 828	$ 617
Loss coverage ratio	0.70%	0.60%
Acquired
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	$ 304	$ 353
Total loans outstanding	326,659	373,757
Acquired | Real estate
Loans by Portfolio Segment and Impairment Method [Abstract]
Total loans outstanding	251,624	288,806
Allowance for loan losses - Total	12,626	12,823	13,724	8,573
Acquired | Real estate | Residential
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	0	0
Total loans outstanding	781	789
Acquired | Real estate | Construction
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	0	0
Total loans outstanding	$ 0	0
Acquired | Commercial business
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	$ 96	128
Total loans outstanding	36,198	43,760
Allowance for loan losses - Total	154	214	422	485
Acquired | Trade finance
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	0	0
Total loans outstanding	0	0
Allowance for loan losses - Total	0	0	0	0
Acquired | Consumer and other
Loans by Portfolio Segment and Impairment Method [Abstract]
Specific allowance	0	0
Total loans outstanding	38,837	41,191
Allowance for loan losses - Total	$ 60	$ 62	$ 51	$ 56

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