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Allowance for Credit Losses (Schedule of Aging of the Company's Loan Portfolio) (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 93,666	$ 98,379	$ 89,694
Loans, net of unearned income	41,023,408	39,196,485	37,053,103
Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Nonaccrual	117	31,279	23,815
Loans, net of unearned income	187,848	164,788	113,856
Commercial
Financing Receivable, Past Due [Line Items]
Nonaccrual	40,460	35,579	32,436
Loans, net of unearned income	12,600,471	12,549,164	12,047,105
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	10,608,811	9,950,947	9,407,205
Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Nonaccrual	12,536	416	889
Loans, net of unearned income	1,760,436	1,486,930	1,506,318
Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Nonaccrual	5,947	5,971	9,829
Loans, net of unearned income	8,848,375	8,464,017	7,900,887
Home equity
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,361	1,487	1,084
Loans, net of unearned income	336,974	332,698	325,826
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	2,643,240	2,372,383	2,078,907
Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	13,652	10,171	8,330
Loans, net of unearned income	2,455,392	2,207,595	1,965,051
Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	19,583	13,470	13,303
Loans, net of unearned income	6,762,698	5,849,459	5,541,447
Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	6	0	0
Loans, net of unearned income	8,039,273	8,090,998	7,608,433
Consumer and other
Financing Receivable, Past Due [Line Items]
Nonaccrual	4	6	8
Loans, net of unearned income	31,941	50,836	44,180
Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	93,549	67,100	65,879
Loans, net of unearned income	40,835,560	39,031,697	36,939,247
90+ days and still accruing
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	72,891	81,047	56,786
90+ days and still accruing | Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	57,728	47,450	50,314
90+ days and still accruing | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	573	462	0
90+ days and still accruing | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	0	0
90+ days and still accruing | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	0	0
90+ days and still accruing | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	110	0	0
90+ days and still accruing | Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	0	0
90+ days and still accruing | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	12,785	15,841	6,447
90+ days and still accruing | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	1,667	17,245	0
90+ days and still accruing | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	28	49	25
90+ days and still accruing | Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	15,163	33,597	6,472
60-89 days past due
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	58,789	48,924	41,623
60-89 days past due | Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	918	984	272
60-89 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	22,808	21,128	16,789
60-89 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	361	0
60-89 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	1,054	1,883	6,771
60-89 days past due | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	316	0	154
60-89 days past due | Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	7,243	4,364	534
60-89 days past due | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	22,670	14,926	15,299
60-89 days past due | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	3,729	5,260	1,796
60-89 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	51	18	8
60-89 days past due | Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	57,871	47,940	41,351
30-59 days past due
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	187,675	210,595	138,004
30-59 days past due | Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	1,584	0
30-59 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	48,970	56,696	14,120
30-59 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	766	14,390	1,144
30-59 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	13,452	16,285	33,076
30-59 days past due | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	601	2,152	930
30-59 days past due | Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	872	9,982	147
30-59 days past due | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	32,751	40,557	23,313
30-59 days past due | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	90,117	68,725	65,155
30-59 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	146	224	119
30-59 days past due | Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	187,675	209,011	138,004
Current
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	40,610,387	38,757,540	36,726,996
Current | Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	129,085	83,491	39,455
Current | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	12,487,660	12,435,299	11,983,760
Current | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	1,747,134	1,471,763	1,504,285
Current | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	8,827,922	8,439,878	7,851,211
Current | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	334,586	329,059	323,658
Current | Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	2,433,625	2,183,078	1,956,040
Current | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	6,674,909	5,764,665	5,483,085
Current | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	7,943,754	7,999,768	7,541,482
Current | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	31,712	50,539	44,020
Current | Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	$ 40,481,302	$ 38,674,049	$ 36,687,541

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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