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Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | $ 245,996 |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance | 270,151 | $ 245,996 |
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 74,006 | 104,237 | $ 72,091
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | 24,494 | (16,709) | 34,479
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | (14,828) | (18,315) | (6,575)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery | 3,897 | 4,793 | 4,242
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (10,931) | (13,522) | (2,333)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance | 87,569 | 74,006 | 104,237
Commercial And Industrial Energy Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 17,814 | 18,062 | 17,217
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | (8,977) | (1,067) | (313)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | (79) | (518) | (371)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery | 1,234 | 1,337 | 1,529
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | 1,155 | 819 | 1,158
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance | 9,992 | 17,814 | 18,062
Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 130,598 | 90,301 | 144,936
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | 16,479 | 40,889 | (54,775)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | (3,919) | (955) | (702)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery | 47 | 363 | 842
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (3,872) | (592) | 140
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance | 143,205 | 130,598 | 90,301
Total consumer real estate loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 13,538 | 8,004 | 6,585
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | 9,753 | 6,736 | 1,813
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | (4,940) | (2,883) | (912)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery | 755 | 1,681 | 518
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (4,185) | (1,202) | (394)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance | 19,106 | 13,538 | 8,004
Consumer Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 10,040 | 7,017 | 7,837
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | 23,083 | 23,012 | 13,517
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | (33,344) | (31,260) | (24,388)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery | 10,500 | 11,271 | 10,051
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (22,844) | (19,989) | (14,337)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance | 10,279 | 10,040 | 7,017
Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 245,996 | 227,621 | 248,666
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | 64,832 | 52,861 | (5,279)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | (57,110) | (53,931) | (32,948)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery | 16,433 | 19,445 | 17,182
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (40,677) | (34,486) | (15,766)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance | $ 270,151 | $ 245,996 | $ 227,621

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