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Loans Receivable and Allowance for Loan Losses - Allowance for Loans, by Portfolio Segment and Impairment Method (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Financing Receivable, Impaired [Line Items] |  |  |  |  |
Positive or Negative Qualitative Adjustment of the Loss Migration Ratio or Individual Specific Reserve Allocations, In Basis Points |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Impaired loans, gross carrying value | $ 116,269 |  | $ 90,155 |  |
Specific allowance | 12,666 |  | 9,160 |  |
Loss coverage ratio | 10.90% |  | 10.20% |  |
Non-impaired loans | 4,960,074 |  | 4,208,183 |  |
General allowance | 54,654 |  | 57,781 |  |
Loss coverage ratio | 1.10% |  | 1.40% |  |
Total loans outstanding | 5,076,343 |  | 4,298,338 |  |
Allowance for loan losses - Total | 67,320 |  | 66,941 |  | 61,952
Loss coverage ratio | 1.30% |  | 1.60% |  |
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 | 10,039 |  | 9,247 |  |
General allowance | 25 |  | 74 |  |
Loss coverage ratio | 0.20% |  | 0.80% |  |
Total loans outstanding | 10,039 |  | 9,247 |  |
Allowance for loan losses - Total | 25 |  | 74 |  |
Loss coverage ratio | 0.20% |  | 0.80% |  |
Real estate-Commercial |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Impaired loans, gross carrying value | 67,544 |  | 53,634 |  |
Specific allowance | 6,670 |  | 4,906 |  |
Loss coverage ratio | 9.90% |  | 9.10% |  |
Non-impaired loans | 3,753,619 |  | 3,046,832 |  |
General allowance | 39,227 |  | 40,256 |  |
Loss coverage ratio | 1.00% |  | 1.30% |  |
Total loans outstanding | 3,821,163 |  | 3,100,466 |  |
Allowance for loan losses - Total | 45,897 |  | 45,162 |  |
Loss coverage ratio | 1.20% |  | 1.50% |  |
Real estate-Construction |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Impaired loans, gross carrying value | 1,625 |  | 1,710 |  |
Specific allowance | 0 |  | 0 |  |
Loss coverage ratio | 0.00% |  | 0.00% |  |
Non-impaired loans | 71,231 |  | 63,335 |  |
General allowance | 628 |  | 986 |  |
Loss coverage ratio | 0.90% |  | 1.60% |  |
Total loans outstanding | 72,856 |  | 65,045 |  |
Allowance for loan losses - Total | 628 |  | 986 |  |
Loss coverage ratio | 0.90% |  | 1.50% |  |
Commercial business |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Impaired loans, gross carrying value | 40,106 |  | 27,274 |  |
Specific allowance | 5,805 |  | 4,158 |  |
Loss coverage ratio | 14.50% |  | 15.20% |  |
Non-impaired loans | 908,987 |  | 894,282 |  |
General allowance | 11,787 |  | 13,448 |  |
Loss coverage ratio | 1.30% |  | 1.50% |  |
Total loans outstanding | 949,093 |  | 921,556 |  |
Allowance for loan losses - Total | 17,592 |  | 17,606 |  |
Loss coverage ratio | 1.90% |  | 1.90% |  |
Trade finance |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Impaired loans, gross carrying value | 5,692 |  | 6,199 |  |
Specific allowance | 159 |  | 96 |  |
Loss coverage ratio | 2.80% |  | 1.50% |  |
Non-impaired loans | 118,993 |  | 145,871 |  |
General allowance | 2,494 |  | 2,256 |  |
Loss coverage ratio | 2.10% |  | 1.50% |  |
Total loans outstanding | 124,685 |  | 152,070 |  |
Allowance for loan losses - Total | 2,653 |  | 2,352 |  |
Loss coverage ratio | 2.10% |  | 1.50% |  |
Consumer and Other |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Impaired loans, gross carrying value | 1,302 |  | 1,338 |  |
Specific allowance | 32 |  | 0 |  |
Loss coverage ratio | 2.50% |  | 0.00% |  |
Non-impaired loans | 97,205 |  | 48,616 |  |
General allowance | 493 |  | 761 |  |
Loss coverage ratio | 0.50% |  | 1.60% |  |
Total loans outstanding | 98,507 |  | 49,954 |  |
Allowance for loan losses - Total | 525 |  | 761 |  |
Loss coverage ratio | 0.50% |  | 1.50% |  |
Real Estate |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Total loans outstanding | 3,904,058 |  | 3,174,758 |  |
Legacy |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Total loans outstanding |  |  | 3,356,522 |  |
Legacy | Real estate-Residential |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Total loans outstanding |  |  | 9,247 |  |
Legacy | Real estate-Construction |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Total loans outstanding |  |  | 57,980 |  |
Legacy | Commercial business |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Total loans outstanding | 815,664 |  | 753,855 |  |
Allowance for loan losses - Total | 16,796 |  | 16,490 |  | 20,681
Legacy | Trade finance |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Total loans outstanding | 122,941 |  | 150,372 |  |
Allowance for loan losses - Total | 2,653 |  | 2,349 |  | 1,786
Legacy | Consumer and Other |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Total loans outstanding | 32,956 |  | 27,820 |  |
Allowance for loan losses - Total | 461 |  | 658 |  | 445
Legacy | Real Estate |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Total loans outstanding | 3,126,101 |  | 2,424,474 |  |
Allowance for loan losses - Total | 40,068 |  | 41,505 |  | 39,040
Acquired |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Specific allowance | 1,714 | [1] | 1,257 | [1] |
Total loans outstanding |  |  | 941,816 |  |
Acquired | Real estate-Residential |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Specific allowance | 0 | [1] | 0 | [1] |
Total loans outstanding |  |  | 0 |  |
Acquired | Real estate-Construction |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Specific allowance | 0 | [1] | 0 | [1] |
Total loans outstanding |  |  | 7,065 |  |
Acquired | Commercial business |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Specific allowance | 622 | [1] | 1,074 | [1] |
Total loans outstanding | 133,429 |  | 167,701 |  |
Allowance for loan losses - Total | 796 |  | 1,115 |  | 0
Acquired | Trade finance |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Specific allowance | 0 | [1] | 0 | [1] |
Total loans outstanding | 1,744 |  | 1,698 |  |
Allowance for loan losses - Total | 0 |  | 3 |  | 0
Acquired | Consumer and Other |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Specific allowance | 0 | [1] | 0 | [1] |
Total loans outstanding | 65,551 |  | 22,134 |  |
Allowance for loan losses - Total | 64 |  | 103 |  | 0
Acquired | Real Estate |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |
Total loans outstanding | 777,957 |  | 750,284 |  |
Allowance for loan losses - Total | $ 6,482 |  | $ 4,718 |  | $ 0
[1] | APLs that became impaired subsequent to being acquired.

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