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Commitments and Contingencies (Credit-related Commitments) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Commitments and Contingencies Disclosure [Abstract] |  |
Loan commitments | $ 4,818,815 | $ 5,075,480
Commercial letters of credit and SBLCs | $ 1,632,585 | $ 1,655,897

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
Name: | us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant