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Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 263,177 | $ 132,167 |  |
Impact of New Accounting Pronouncement | 39,377 | 0 | $ 0 |
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 73,843 | 51,593 | 48,580 | $ 59,614
Impact of New Accounting Pronouncement | 21,263 |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | 15,156 | 13,144 | 11,354 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (18,908) | (14,117) | (26,076) |
Financing Receivable, Allowance for Credit Loss, Recovery | 4,739 | 3,986 | 3,688 |
Allowance for Loan and Lease Losses Write-offs, Net | (14,169) | (10,131) | (22,388) |
Commercial And Industrial Energy Financing Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 39,553 | 37,382 | 29,052 | 51,528
Impact of New Accounting Pronouncement | (10,453) |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | 85,889 | 14,388 | (9,355) |
Financing Receivable, Allowance for Credit Loss, Writeoff | (76,107) | (7,500) | (13,940) |
Financing Receivable, Allowance for Credit Loss, Recovery | 2,842 | 1,442 | 819 |
Allowance for Loan and Lease Losses Write-offs, Net | (73,265) | (6,058) | (13,121) |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 134,892 | 31,037 | 38,777 | 30,948
Impact of New Accounting Pronouncement | (13,519) |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | 124,427 | (6,934) | 8,079 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (7,499) | (1,025) | (619) |
Financing Receivable, Allowance for Credit Loss, Recovery | 446 | 219 | 369 |
Allowance for Loan and Lease Losses Write-offs, Net | (7,053) | (806) | (250) |
Total consumer real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 7,926 | 4,113 | 6,103 | 5,657
Impact of New Accounting Pronouncement | 2,392 |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | 1,906 | 467 | 1,984 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (2,186) | (3,665) | (2,143) |
Financing Receivable, Allowance for Credit Loss, Recovery | 1,701 | 1,208 | 605 |
Allowance for Loan and Lease Losses Write-offs, Net | (485) | (2,457) | (1,538) |
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 6,963 | 8,042 | 9,620 | 7,617
Impact of New Accounting Pronouncement | (2,248) |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | 9,632 | 12,694 | 9,551 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (17,830) | (24,725) | (17,197) |
Financing Receivable, Allowance for Credit Loss, Recovery | 9,367 | 10,453 | 9,649 |
Allowance for Loan and Lease Losses Write-offs, Net | (8,463) | (14,272) | (7,548) |
Loans Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 263,177 | 132,167 | 132,132 | $ 155,364
Impact of New Accounting Pronouncement | (2,565) |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | 237,010 | 33,759 | 21,613 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (122,530) | (51,032) | (59,975) |
Financing Receivable, Allowance for Credit Loss, Recovery | 19,095 | 17,308 | 15,130 |
Allowance for Loan and Lease Losses Write-offs, Net | $ (103,435) | $ (33,724) | $ (44,845) |

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