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Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities that were Considered Troubled Debt Restructurings (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Modification
Sep. 30, 2022
USD ($)
Modification
Financing Receivable, Modifications [Line Items]    
Number of modifications | Modification 839 2,691
Pre-modification Recorded Investment $ 88,700 $ 227,509
Loans and leases, net of unearned discount $ 89,800 $ 231,516
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Modifications [Line Items]    
Number of modifications | Modification 70 147
Pre-modification Recorded Investment $ 32,451 $ 79,437
Loans and leases, net of unearned discount $ 33,431 $ 81,371
Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Number of modifications | Modification 14 44
Pre-modification Recorded Investment $ 22,951 $ 33,349
Loans and leases, net of unearned discount $ 22,887 $ 33,003
Residential [Member]    
Financing Receivable, Modifications [Line Items]    
Number of modifications | Modification 57 221
Pre-modification Recorded Investment $ 14,380 $ 56,912
Loans and leases, net of unearned discount $ 14,564 $ 59,290
Residential Limited Documentation [Member]    
Financing Receivable, Modifications [Line Items]    
Number of modifications | Modification 2 7
Pre-modification Recorded Investment $ 155 $ 1,231
Loans and leases, net of unearned discount $ 155 $ 1,242
Home Equity Lines and Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of modifications | Modification 25 93
Pre-modification Recorded Investment $ 1,700 $ 6,483
Loans and leases, net of unearned discount $ 1,700 $ 6,550
Recreational Finance [Member]    
Financing Receivable, Modifications [Line Items]    
Number of modifications | Modification 167 514
Pre-modification Recorded Investment $ 6,937 $ 19,138
Loans and leases, net of unearned discount $ 6,937 $ 19,131
Automobile [Member]    
Financing Receivable, Modifications [Line Items]    
Number of modifications | Modification 474 1,537
Pre-modification Recorded Investment $ 9,755 $ 29,789
Loans and leases, net of unearned discount $ 9,755 $ 29,759
Other [Member]    
Financing Receivable, Modifications [Line Items]    
Number of modifications | Modification 30 128
Pre-modification Recorded Investment $ 371 $ 1,170
Loans and leases, net of unearned discount 371 1,170
Principal Deferral [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 48,275 160,742
Principal Deferral [Member] | Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 11,237 49,671
Principal Deferral [Member] | Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 7,222 13,052
Principal Deferral [Member] | Residential [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 11,094 40,821
Principal Deferral [Member] | Residential Limited Documentation [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 155 1,049
Principal Deferral [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 1,504 6,089
Principal Deferral [Member] | Recreational Finance [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 6,937 19,131
Principal Deferral [Member] | Automobile [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 9,755 29,759
Principal Deferral [Member] | Other [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 371 1,170
Interest Rate Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 446 455
Interest Rate Reduction [Member] | Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 446 455
Other [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 351 3,206
Other [Member] | Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 229 983
Other [Member] | Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 122 2,223
Combination of Concession Types [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 40,728 67,113
Combination of Concession Types [Member] | Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 21,519 30,262
Combination of Concession Types [Member] | Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 15,543 17,728
Combination of Concession Types [Member] | Residential [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount 3,470 18,469
Combination of Concession Types [Member] | Residential Limited Documentation [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount   193
Combination of Concession Types [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and leases, net of unearned discount $ 196 $ 461