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Commitments and Contingencies - Financial instruments with off-Balance Sheet credit risk (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Commitments To Extend Credit | Credit card |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | $ 4,889,694 | $ 4,468,481
Commitments To Extend Credit | Commercial and construction lines of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 3,205,306 | 2,751,390
Commitments To Extend Credit | Other consumer unused credit commitments |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 262,516 | 254,491
Commercial Letters of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 2,629 | 2,695
Standby Letters of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 75,186 | 26,479
Commitments to originate or fund mortgage loans |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | $ 96,653 | $ 22,629

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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