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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 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
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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 | 0.50% |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |  |
Impaired loans (gross carrying value) | $ 130,700 |  | $ 116,269 |  |  |
Specific allowance | 10,696 |  | 12,666 |  |  |
Loss coverage ratio | 8.20% |  | 10.90% |  |  |
Non-impaired loans | 5,303,546 |  | 4,960,074 |  |  |
General allowance | 57,536 |  | 54,654 |  |  |
Loss coverage ratio | 1.10% |  | 1.10% |  |  |
Total loans outstanding | 5,434,246 |  | 5,076,343 |  |  |
Allowance for loan losses - Total | 68,232 | 66,870 | 67,320 | 65,715 | 71,675 | 66,941
Loss coverage ratio | 1.30% |  | 1.30% |  |  |
Real estate |  |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |  |
Total loans outstanding | 4,317,960 |  | 3,904,058 |  |  |
Real estate | Residential |  |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |  |
Impaired loans (gross carrying value) | 0 |  | 0 |  |  |
Specific allowance | 0 |  | 0 |  |  |
Loss coverage ratio | 0.00% |  | 0.00% |  |  |
Non-impaired loans | 19,203 |  | 10,039 |  |  |
General allowance | 131 |  | 25 |  |  |
Loss coverage ratio | 0.70% |  | 0.20% |  |  |
Total loans outstanding | 19,203 |  | 10,039 |  |  |
Allowance for loan losses - Total | 131 |  | 25 |  |  |
Loss coverage ratio | 0.70% |  | 0.20% |  |  |
Real estate | Commercial |  |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |  |
Impaired loans (gross carrying value) | 75,565 |  | 67,544 |  |  |
Specific allowance | 3,626 |  | 6,670 |  |  |
Loss coverage ratio | 4.80% |  | 9.90% |  |  |
Non-impaired loans | 4,136,412 |  | 3,753,619 |  |  |
General allowance | 44,650 |  | 39,227 |  |  |
Loss coverage ratio | 1.10% |  | 1.00% |  |  |
Total loans outstanding | 4,211,977 |  | 3,821,163 |  |  |
Allowance for loan losses - Total | 48,276 |  | 45,897 |  |  |
Loss coverage ratio | 1.10% |  | 1.20% |  |  |
Real estate | Construction |  |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |  |
Impaired loans (gross carrying value) | 1,576 |  | 1,625 |  |  |
Specific allowance | 0 |  | 0 |  |  |
Loss coverage ratio | 0.00% |  | 0.00% |  |  |
Non-impaired loans | 85,204 |  | 71,231 |  |  |
General allowance | 446 |  | 628 |  |  |
Loss coverage ratio | 0.50% |  | 0.90% |  |  |
Total loans outstanding | 86,780 |  | 72,856 |  |  |
Allowance for loan losses - Total | 446 |  | 628 |  |  |
Loss coverage ratio | 0.50% |  | 0.90% |  |  |
Commercial business |  |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |  |
Impaired loans (gross carrying value) | 42,471 |  | 40,106 |  |  |
Specific allowance | 4,446 |  | 5,805 |  |  |
Loss coverage ratio | 10.50% |  | 14.50% |  |  |
Non-impaired loans | 833,337 |  | 908,987 |  |  |
General allowance | 9,736 |  | 11,787 |  |  |
Loss coverage ratio | 1.20% |  | 1.30% |  |  |
Total loans outstanding | 875,808 |  | 949,093 |  |  |
Allowance for loan losses - Total | 14,182 |  | 17,592 |  |  |
Loss coverage ratio | 1.60% |  | 1.90% |  |  |
Trade finance |  |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |  |
Impaired loans (gross carrying value) | 9,976 |  | 5,692 |  |  |
Specific allowance | 2,624 |  | 159 |  |  |
Loss coverage ratio | 26.30% |  | 2.80% |  |  |
Non-impaired loans | 138,140 |  | 118,993 |  |  |
General allowance | 2,027 |  | 2,494 |  |  |
Loss coverage ratio | 1.50% |  | 2.10% |  |  |
Total loans outstanding | 148,116 |  | 124,685 |  |  |
Allowance for loan losses - Total | 4,651 |  | 2,653 |  |  |
Loss coverage ratio | 3.10% |  | 2.10% |  |  |
Consumer and other |  |  |  |  |  |
Loans by Portfolio Segment and Impairment Method [Abstract] |  |  |  |  |  |
Impaired loans (gross carrying value) | 1,112 |  | 1,302 |  |  |
Specific allowance | 0 |  | 32 |  |  |
Loss coverage ratio | 0.00% |  | 2.50% |  |  |
Non-impaired loans | 91,250 |  | 97,205 |  |  |
General allowance | 546 |  | 493 |  |  |
Loss coverage ratio | 0.60% |  | 0.50% |  |  |
Total loans outstanding | 92,362 |  | 98,507 |  |  |
Allowance for loan losses - Total | $ 546 |  | $ 525 |  |  |
Loss coverage ratio | 0.60% |  | 0.50% |  |  |

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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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