Loans and Leases - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 129,492,304	$ 92,040,032
30-89 Days Past Due	1,779,054	845,930
Accruing Loans Past Due 90 Days or More	491,018	963,399
Nonaccrual	2,438,435	2,060,083
Loans and leases, net of unearned discount	131,564,163	92,912,452
Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	126,855,656	89,043,040
Commercial, Financial, Leasing, etc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	448,462	142,208
Accruing Loans Past Due 90 Days or More	72,502	8,284
Nonaccrual	347,204	221,022
Loans and leases, net of unearned discount	41,850,566	23,473,324
Commercial, Financial, Leasing, etc. [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	40,982,398	23,101,810
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	311,188	319,099
Accruing Loans Past Due 90 Days or More	67,696	31,733
Nonaccrual	1,396,662	1,069,280
Loans and leases, net of unearned discount	36,748,173	26,132,755
Commercial [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	34,972,627	24,712,643
Residential Builder and Developer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	8,703	2,904
Nonaccrual	1,229	3,005
Loans and leases, net of unearned discount	1,314,730	1,406,346
Residential Builder and Developer [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,304,798	1,400,437
Other Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	239,521	17,175
Accruing Loans Past Due 90 Days or More	549
Nonaccrual	124,937	111,405
Loans and leases, net of unearned discount	7,301,668	7,850,629
Other Commercial Construction [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,936,661	7,722,049
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	595,897	239,561
Accruing Loans Past Due 90 Days or More	345,402	920,080
Nonaccrual	272,090	355,858
Loans and leases, net of unearned discount	22,704,895	14,810,371
Residential [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	21,491,506	13,294,872
Residential Limited Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	22,456	16,666
Nonaccrual	77,814	122,888
Loans and leases, net of unearned discount	1,051,052	1,264,074
Residential Limited Documentation [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	950,782	1,124,520
Home Equity Lines and Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	30,787	15,486
Nonaccrual	84,788	70,488
Loans and leases, net of unearned discount	5,006,886	3,562,591
Home Equity Lines and Loans [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,891,311	3,476,617
Recreational Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	54,593	40,544
Nonaccrual	44,630	27,811
Loans and leases, net of unearned discount	9,073,394	8,053,528
Recreational Finance [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,974,171	7,985,173
Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	44,486	40,064
Nonaccrual	39,584	34,037
Loans and leases, net of unearned discount	4,477,276	4,678,873
Automobile [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,393,206	4,604,772
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	22,961	12,223
Accruing Loans Past Due 90 Days or More	4,869	3,302
Nonaccrual	49,497	44,289
Loans and leases, net of unearned discount	2,035,523	1,679,961
Other [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 1,958,196	$ 1,620,147