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Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | $ 227,621 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 245,996 | $ 227,621 |
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 104,237 | 72,091 | $ 73,843
Financing Receivable, Credit Loss, Expense (Reversal) | (16,709) | 34,479 | (2,160)
Financing Receivable, Allowance for Credit Loss, Writeoff | (18,315) | (6,575) | (5,513)
Financing Receivable, Allowance for Credit Loss, Recovery | 4,793 | 4,242 | 5,921
Allowance for Loan and Lease Losses Write-offs, Net | (13,522) | (2,333) | 408
Financing Receivable, Allowance for Credit Loss, Ending Balance | 74,006 | 104,237 | 72,091
Commercial And Industrial Energy Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 18,062 | 17,217 | 39,553
Financing Receivable, Credit Loss, Expense (Reversal) | (1,067) | (313) | (19,207)
Financing Receivable, Allowance for Credit Loss, Writeoff | (518) | (371) | (5,331)
Financing Receivable, Allowance for Credit Loss, Recovery | 1,337 | 1,529 | 2,202
Allowance for Loan and Lease Losses Write-offs, Net | 819 | 1,158 | (3,129)
Financing Receivable, Allowance for Credit Loss, Ending Balance | 17,814 | 18,062 | 17,217
Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 90,301 | 144,936 | 134,892
Financing Receivable, Credit Loss, Expense (Reversal) | 40,889 | (54,775) | 8,101
Financing Receivable, Allowance for Credit Loss, Writeoff | (955) | (702) | (399)
Financing Receivable, Allowance for Credit Loss, Recovery | 363 | 842 | 2,342
Allowance for Loan and Lease Losses Write-offs, Net | (592) | 140 | 1,943
Financing Receivable, Allowance for Credit Loss, Ending Balance | 130,598 | 90,301 | 144,936
Total consumer real estate loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 8,004 | 6,585 | 7,926
Financing Receivable, Credit Loss, Expense (Reversal) | 6,736 | 1,813 | (3,061)
Financing Receivable, Allowance for Credit Loss, Writeoff | (2,883) | (912) | (829)
Financing Receivable, Allowance for Credit Loss, Recovery | 1,681 | 518 | 2,549
Allowance for Loan and Lease Losses Write-offs, Net | (1,202) | (394) | 1,720
Financing Receivable, Allowance for Credit Loss, Ending Balance | 13,538 | 8,004 | 6,585
Consumer Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 7,017 | 7,837 | 6,963
Financing Receivable, Credit Loss, Expense (Reversal) | 23,012 | 13,517 | 10,230
Financing Receivable, Allowance for Credit Loss, Writeoff | (31,260) | (24,388) | (18,614)
Financing Receivable, Allowance for Credit Loss, Recovery | 11,271 | 10,051 | 9,258
Allowance for Loan and Lease Losses Write-offs, Net | (19,989) | (14,337) | (9,356)
Financing Receivable, Allowance for Credit Loss, Ending Balance | 10,040 | 7,017 | 7,837
Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 227,621 | 248,666 | 263,177
Financing Receivable, Credit Loss, Expense (Reversal) | 52,861 | (5,279) | (6,097)
Financing Receivable, Allowance for Credit Loss, Writeoff | (53,931) | (32,948) | (30,686)
Financing Receivable, Allowance for Credit Loss, Recovery | 19,445 | 17,182 | 22,272
Allowance for Loan and Lease Losses Write-offs, Net | (34,486) | (15,766) | (8,414)
Financing Receivable, Allowance for Credit Loss, Ending Balance | $ 245,996 | $ 227,621 | $ 248,666

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