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Commitments and Contingencies - Financial instruments with off-Balance Sheet credit risk (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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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 | $ 4,958,736 | $ 4,889,694
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 | 2,938,929 | 3,205,306
Commitments To Extend Credit | Other consumer unused credit commitments |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 259,580 | 262,516
Commercial Letters of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 1,644 | 2,629
Standby Letters of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 71,739 | 75,186
Commitments to originate or fund mortgage loans |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | $ 26,818 | $ 96,653

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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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Balance Type: | credit
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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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