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Note Commitments and Contingencies (Financial instruments with off-Balance Sheet credit risk) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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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 | $ 4,462,603 | $ 4,303,256
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 | 2,772,111 | 3,011,673
Commitments To Extend Credit | Other consumer unused credit commitments |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 255,798 | 250,029
Commercial Letters of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 2,561 | 2,116
Standby Letters of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | 30,036 | 33,633
Commitments to originate or fund mortgage loans |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Unused Commitments To Extend Credit | $ 23,724 | $ 15,297

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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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