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Loans - Weighted Average Risk Grades for All Commercial Loans by Class (Detail) $ in Thousands | Mar. 31, 2024 USD ($) Grade | Dec. 31, 2023 USD ($) Grade
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ 19,388,206 | $ 18,824,251
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.67 | 6.60
Loans and Leases Receivable, Net of Deferred Income | $ 6,108,136 | $ 5,967,182
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.00 | 6.05
Loans and Leases Receivable, Net of Deferred Income | $ 937,880 | $ 936,737
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.26 | 7.20
Loans and Leases Receivable, Net of Deferred Income | $ 7,548,222 | $ 7,301,920
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.56 | 7.45
Loans and Leases Receivable, Net of Deferred Income | $ 1,772,416 | $ 1,680,724
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.32 | 7.24
Loans and Leases Receivable, Net of Deferred Income | $ 9,320,638 | $ 8,982,644
Risk Grade One To Eight [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.28 | 6.32
Loans and Leases Receivable, Net of Deferred Income | $ 5,469,589 | $ 5,507,878
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 | 5.69 | 5.73
Loans and Leases Receivable, Net of Deferred Income | $ 876,532 | $ 871,221
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 | 7.04 | 7.03
Loans and Leases Receivable, Net of Deferred Income | $ 6,925,310 | $ 6,895,358
Risk Grade One To Eight [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.29 | 7.27
Loans and Leases Receivable, Net of Deferred Income | $ 1,565,098 | $ 1,526,086
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 |  | 7.07
Loans and Leases Receivable, Net of Deferred Income |  | $ 8,421,444
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 | $ 252,038 | $ 205,244
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 | $ 25,255 | $ 27,643
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 | $ 341,075 | $ 173,470
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 | $ 119,967 | $ 127,102
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 |  | $ 300,572
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 | $ 160,698 | $ 109,254
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 | $ 1,890 | $ 818
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 | $ 126,160 | $ 96,601
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 | $ 40,854 | $ 17,035
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 |  | $ 113,636
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 | $ 200,365 | $ 125,261
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 | $ 23,910 | $ 25,555
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 | $ 125,665 | $ 114,071
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 | $ 46,497 | $ 10,501
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 |  | $ 124,572
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 | $ 20,327 | $ 17,102
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 | $ 7,593 | $ 8,800
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 | $ 25,740 | $ 19,770
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 |  | $ 19,770
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 | $ 5,119 | $ 2,443
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 | $ 2,700
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 | $ 4,272 | $ 2,650
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 |  | $ 2,650

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