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Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 248,666 | $ 263,177 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 72,091 | 73,843 | $ 51,593 |  | $ 48,580
Financing Receivable, Credit Loss, Expense (Reversal) | (2,160) | 15,156 | 13,144 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (5,513) | (18,908) | (14,117) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 5,921 | 4,739 | 3,986 |  |
Allowance for Loan and Lease Losses Write-offs, Net | 408 | (14,169) | (10,131) |  |
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | $ 21,263 |
Commercial And Industrial Energy Financing Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 17,217 | 39,553 | 37,382 |  | 29,052
Financing Receivable, Credit Loss, Expense (Reversal) | (19,207) | 85,889 | 14,388 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (5,331) | (76,107) | (7,500) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 2,202 | 2,842 | 1,442 |  |
Allowance for Loan and Lease Losses Write-offs, Net | (3,129) | (73,265) | (6,058) |  |
Commercial And Industrial Energy Financing Receivable [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | (10,453) |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 144,936 | 134,892 | 31,037 |  | 38,777
Financing Receivable, Credit Loss, Expense (Reversal) | 8,101 | 124,427 | (6,934) |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (399) | (7,499) | (1,025) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 2,342 | 446 | 219 |  |
Allowance for Loan and Lease Losses Write-offs, Net | 1,943 | (7,053) | (806) |  |
Commercial Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | (13,519) |
Total consumer real estate loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 6,585 | 7,926 | 4,113 |  | 6,103
Financing Receivable, Credit Loss, Expense (Reversal) | (3,061) | 1,906 | 467 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (829) | (2,186) | (3,665) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 2,549 | 1,701 | 1,208 |  |
Allowance for Loan and Lease Losses Write-offs, Net | 1,720 | (485) | (2,457) |  |
Total consumer real estate loans [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 2,392 |
Consumer Loan [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 7,837 | 6,963 | 8,042 |  | 9,620
Financing Receivable, Credit Loss, Expense (Reversal) | 10,230 | 9,632 | 12,694 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (18,614) | (17,830) | (24,725) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 9,258 | 9,367 | 10,453 |  |
Allowance for Loan and Lease Losses Write-offs, Net | (9,356) | (8,463) | (14,272) |  |
Consumer Loan [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | (2,248) |
Loans Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 248,666 | 263,177 | 132,167 |  | $ 132,132
Financing Receivable, Credit Loss, Expense (Reversal) | (6,097) | 237,010 | 33,759 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (30,686) | (122,530) | (51,032) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 22,272 | 19,095 | 17,308 |  |
Allowance for Loan and Lease Losses Write-offs, Net | $ (8,414) | $ (103,435) | $ (33,724) |  |
Loans Receivable [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | $ (2,565) |

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