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Commitments and Contingencies - Financial instruments with off-Balance Sheet credit risk (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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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 | $ 5,271,202 | $ 5,226,660
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 | 3,844,356 | 3,805,459
Commitments To Extend Credit | Other consumer unused credit commitments |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 251,574 | 257,312
Commercial Letters of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 3,090 | 1,864
Standby Letters of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 21,330 | 22,266
Commitments to originate or fund mortgage loans |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | $ 107,464 | $ 96,786

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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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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
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