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Commitments and Contingencies (Credit-Related Commitments) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Commitments and Contingencies Disclosure [Abstract] |  |
Loan commitments | $ 5,468,590 | $ 5,147,821
Commercial letters of credit and SBLCs | $ 1,912,783 | $ 1,796,647

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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