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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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