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Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 592,096 $ 1,198,066
Percent of total loan class at period end 0.45% 0.91%
Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 583,043 $ 1,167,728
Interest Rate Reduction [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring   515
Combination of Modification Types [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring 9,053 29,823
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 40,262 $ 95,623
Percent of total loan class at period end 0.09% 0.21%
Commercial, Financial, Leasing, etc. [Member] | Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 39,058 $ 93,583
Commercial, Financial, Leasing, etc. [Member] | Interest Rate Reduction [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring   381
Commercial, Financial, Leasing, etc. [Member] | Combination of Modification Types [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring 1,204 1,659
Commercial Real Estate [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 279,454 $ 454,445
Percent of total loan class at period end 0.78% 1.27%
Commercial Real Estate [Member] | Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 273,201 $ 440,195
Commercial Real Estate [Member] | Combination of Modification Types [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring 6,253 14,250
Residential Builder and Developer [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring   $ 70,683
Percent of total loan class at period end   6.42%
Residential Builder and Developer [Member] | Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring   $ 70,683
Other Commercial Construction [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 215,598 $ 439,921
Percent of total loan class at period end 3.20% 6.54%
Other Commercial Construction [Member] | Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 215,598 $ 431,668
Other Commercial Construction [Member] | Combination of Modification Types [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring   8,253
Residential [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 54,685 $ 125,157
Percent of total loan class at period end 0.24% 0.56%
Residential [Member] | Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 53,239 $ 120,632
Residential [Member] | Combination of Modification Types [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring 1,446 4,525
Residential Limited Documentation [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 1,721 $ 10,670
Percent of total loan class at period end 0.18% 1.11%
Residential Limited Documentation [Member] | Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 1,721 $ 9,971
Residential Limited Documentation [Member] | Combination of Modification Types [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring   699
Home Equity Lines and Loans [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 275 $ 1,053
Percent of total loan class at period end 0.01% 0.02%
Home Equity Lines and Loans [Member] | Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 125 $ 482
Home Equity Lines and Loans [Member] | Interest Rate Reduction [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring   134
Home Equity Lines and Loans [Member] | Combination of Modification Types [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring 150 437
Recreational Finance [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring 40 240
Recreational Finance [Member] | Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring 40 240
Automobile [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring 61 $ 274
Percent of total loan class at period end   0.01%
Automobile [Member] | Payment Deferral [Member]    
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications other than troubled debt restructuring $ 61 $ 274