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Loans and Leases and the Allowance for Credit Losses - Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Jan. 01, 2023
Mar. 31, 2022
Jan. 01, 2022
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance $ 882,869 $ 1,094,400 $ 882,869 $ 1,094,400        
Amortized Cost without Allowance 1,552,712 1,538,605 1,552,712 1,538,605        
Total 2,435,581 2,633,005 2,435,581 2,633,005        
Amortized Cost         $ 2,556,799 $ 2,438,435 $ 2,134,231 $ 2,060,083
Interest Income Recognized 12,674 15,815 29,537 45,431        
Commercial, Financial, Leasing, etc. [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 162,087 278,396 162,087 278,396        
Amortized Cost without Allowance 253,935 164,100 253,935 164,100        
Total 416,022 442,496 416,022 442,496        
Amortized Cost         382,268 347,204 275,146 221,022
Interest Income Recognized 1,909 2,121 4,188 15,715        
Commercial [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 415,685 397,536 415,685 397,536        
Amortized Cost without Allowance 967,505 1,079,122 967,505 1,079,122        
Total 1,383,190 1,476,658 1,383,190 1,476,658        
Amortized Cost         1,516,655 1,396,662 1,157,686 1,069,280
Interest Income Recognized 4,432 1,754 9,933 7,885        
Residential Builder and Developer [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 1,193 518 1,193 518        
Total 1,193 518 1,193 518        
Amortized Cost         3,303 1,229 2,916 3,005
Interest Income Recognized 30 259 396 1,687        
Other Commercial Construction [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 44,489 36,345 44,489 36,345        
Amortized Cost without Allowance 101,535 36,701 101,535 36,701        
Total 146,024 73,046 146,024 73,046        
Amortized Cost         143,015 124,937 50,855 111,405
Interest Income Recognized 63 2,750 1,725 3,376        
Residential [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 91,371 175,019 91,371 175,019        
Amortized Cost without Allowance 147,138 156,357 147,138 156,357        
Total 238,509 331,376 238,509 331,376        
Amortized Cost         253,646 272,090 341,671 355,858
Interest Income Recognized 4,391 6,797 8,767 13,338        
Residential Limited Documentation [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 27,013 70,718 27,013 70,718        
Amortized Cost without Allowance 39,601 41,890 39,601 41,890        
Total 66,614 112,608 66,614 112,608        
Amortized Cost         68,935 77,814 123,512 122,888
Interest Income Recognized 96 31 260 227        
Home Equity Lines and Loans [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 48,513 30,328 48,513 30,328        
Amortized Cost without Allowance 28,577 49,117 28,577 49,117        
Total 77,090 79,445 77,090 79,445        
Amortized Cost         80,766 84,788 71,489 70,488
Interest Income Recognized 1,458 1,813 3,679 2,622        
Recreational Finance [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 23,005 26,530 23,005 26,530        
Amortized Cost without Allowance 9,281 6,884 9,281 6,884        
Total 32,286 33,414 32,286 33,414        
Amortized Cost         34,186 44,630 31,546 27,811
Interest Income Recognized 180 161 351 322        
Automobile [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 18,275 31,970 18,275 31,970        
Amortized Cost without Allowance 3,516 4,296 3,516 4,296        
Total 21,791 36,266 21,791 36,266        
Amortized Cost         26,842 39,584 35,350 34,037
Interest Income Recognized 36 37 71 75        
Other [Member]                
Financing Receivable, Impaired [Line Items]                
Amortized Cost with Allowance 51,238 47,040 51,238 47,040        
Amortized Cost without Allowance 1,624 138 1,624 138        
Total 52,862 47,178 52,862 47,178        
Amortized Cost         $ 47,183 $ 49,497 $ 44,060 $ 44,289
Interest Income Recognized $ 79 $ 92 $ 167 $ 184