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Loans - Weighted Average Risk Grades for All Commercial Loans by Class (Detail) $ in Thousands | Sep. 30, 2023 USD ($) Grade | Dec. 31, 2022 USD ($) Grade
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ 18,399,259 | $ 17,154,969
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.46 | 6.39
Loans and Leases Receivable, Net of Deferred Income | $ 5,836,877 | $ 5,674,798
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.10 | 5.67
Loans and Leases Receivable, Net of Deferred Income | $ 1,006,859 | $ 925,729
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.17 | 7.09
Loans and Leases Receivable, Net of Deferred Income | $ 7,193,785 | $ 6,706,078
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.43 | 7.12
Loans and Leases Receivable, Net of Deferred Income | $ 1,544,666 | $ 1,477,247
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.22 | 7.10
Loans and Leases Receivable, Net of Deferred Income | $ 8,738,451 | $ 8,183,325
Risk Grade One To Eight [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.29 | 6.24
Loans and Leases Receivable, Net of Deferred Income | $ 5,581,670 | $ 5,435,917
Risk Grade One To Eight [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 5.67 | 5.44
Loans and Leases Receivable, Net of Deferred Income | $ 903,710 | $ 887,182
Risk Grade One To Eight [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.01 | 6.94
Loans and Leases Receivable, Net of Deferred Income | $ 6,796,148 | $ 6,340,028
Risk Grade One To Eight [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.25 | 7.04
Loans and Leases Receivable, Net of Deferred Income | $ 1,436,402 | $ 1,430,012
Risk Grade One To Eight [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 6.96
Loans and Leases Receivable, Net of Deferred Income |  | $ 7,770,040
Risk Grade Nine [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans and Leases Receivable, Net of Deferred Income | $ 100,090 | $ 146,192
Risk Grade Nine [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans and Leases Receivable, Net of Deferred Income | $ 48,549 | $ 11,112
Risk Grade Nine [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans and Leases Receivable, Net of Deferred Income | $ 169,779 | $ 189,928
Risk Grade Nine [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans and Leases Receivable, Net of Deferred Income | $ 50,601 | $ 34,952
Risk Grade Nine [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 9.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 224,880
Risk Grade Ten [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans and Leases Receivable, Net of Deferred Income | $ 51,100 | $ 37,596
Risk Grade Ten [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans and Leases Receivable, Net of Deferred Income | $ 35,999 | $ 642
Risk Grade Ten [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans and Leases Receivable, Net of Deferred Income | $ 73,158 | $ 91,020
Risk Grade Ten [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans and Leases Receivable, Net of Deferred Income | $ 36,110 | $ 931
Risk Grade Ten [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 10.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 91,951
Risk Grade Eleven [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans and Leases Receivable, Net of Deferred Income | $ 76,691 | $ 36,963
Risk Grade Eleven [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans and Leases Receivable, Net of Deferred Income | $ 4,401 | $ 11,569
Risk Grade Eleven [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans and Leases Receivable, Net of Deferred Income | $ 131,588 | $ 81,550
Risk Grade Eleven [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans and Leases Receivable, Net of Deferred Income | $ 21,553 | $ 11,352
Risk Grade Eleven [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 11.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 92,902
Risk Grade Twelve [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans and Leases Receivable, Net of Deferred Income | $ 21,964 | $ 12,521
Risk Grade Twelve [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans and Leases Receivable, Net of Deferred Income | $ 11,500 | $ 10,840
Risk Grade Twelve [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans and Leases Receivable, Net of Deferred Income | $ 21,666 | $ 2,957
Risk Grade Twelve [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans and Leases Receivable, Net of Deferred Income | $ 0 | $ 0
Risk Grade Twelve [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 12.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 2,957
Risk Grade Thirteen [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans and Leases Receivable, Net of Deferred Income | $ 5,362 | $ 5,609
Risk Grade Thirteen [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans and Leases Receivable, Net of Deferred Income | $ 2,700 | $ 4,384
Risk Grade Thirteen [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans and Leases Receivable, Net of Deferred Income | $ 1,446 | $ 595
Risk Grade Thirteen [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans and Leases Receivable, Net of Deferred Income | $ 0 | $ 0
Risk Grade Thirteen [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 13.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 595

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