Allowance for Credit Losses - Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2022	Jan. 01, 2021	Jan. 01, 2020
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	$ 996,729	$ 789,228	$ 974,782
Amortized Cost without Allowance	1,441,706	1,270,855	918,517
Total	2,438,435	2,060,083	1,893,299
Amortized Cost				$ 2,060,083	$ 1,893,299	$ 1,134,333
Interest Income Recognized	77,250	58,740	54,217
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	173,350	110,790	226,897
Amortized Cost without Allowance	173,854	110,232	79,930
Total	347,204	221,022	306,827
Amortized Cost				221,022	306,827	346,743
Interest Income Recognized	22,336	11,865	11,269
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	404,661	242,078	364,110
Amortized Cost without Allowance	992,001	827,202	411,784
Total	1,396,662	1,069,280	775,894
Amortized Cost				1,069,280	775,894	173,796
Interest Income Recognized	18,117	15,872	7,821
Residential Builder and Developer [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	1,229	613	1,094
Amortized Cost without Allowance		2,392
Total	1,229	3,005	1,094
Amortized Cost				3,005	1,094	4,708
Interest Income Recognized	2,195	973	1,694
Other Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	58,834	30,229	20,992
Amortized Cost without Allowance	66,103	81,176	93,047
Total	124,937	111,405	114,039
Amortized Cost				111,405	114,039	35,881
Interest Income Recognized	3,411	596	8,457
Residential [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	147,461	198,560	159,006
Amortized Cost without Allowance	124,629	157,298	206,723
Total	272,090	355,858	365,729
Amortized Cost				355,858	365,729	322,504
Interest Income Recognized	25,146	23,772	18,069
Residential Limited Documentation [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	47,711	79,777	84,568
Amortized Cost without Allowance	30,103	43,111	62,602
Total	77,814	122,888	147,170
Amortized Cost				122,888	147,170	114,667
Interest Income Recognized	557	528	634
Home Equity Lines and Loans [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	42,699	32,269	61,031
Amortized Cost without Allowance	42,089	38,219	18,361
Total	84,788	70,488	79,392
Amortized Cost				70,488	79,392	65,039
Interest Income Recognized	4,333	3,780	4,092
Recreational Finance [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	36,256	21,476	19,434
Amortized Cost without Allowance	8,374	6,335	6,085
Total	44,630	27,811	25,519
Amortized Cost				27,811	25,519	14,308
Interest Income Recognized	657	637	626
Automobile [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	35,139	29,314	34,044
Amortized Cost without Allowance	4,445	4,723	5,360
Total	39,584	34,037	39,404
Amortized Cost				34,037	39,404	21,293
Interest Income Recognized	144	186	186
Other [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	49,389	44,122	3,606
Amortized Cost without Allowance	108	167	34,625
Total	49,497	44,289	38,231
Amortized Cost				$ 44,289	$ 38,231	$ 35,394
Interest Income Recognized	$ 354	$ 531	$ 1,369