Loans and Leases - Loan Modification Activities that were Considered Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Modification	Dec. 31, 2021 USD ($) Modification	Dec. 31, 2020 USD ($) Modification
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	3,641	2,320	5,250
Pre-modification Recorded Investment	$ 276,197	$ 533,752	$ 862,507
Loans and leases, net of unearned discount	$ 279,832	$ 529,323	$ 806,046
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	193	284	394
Pre-modification Recorded Investment	$ 87,873	$ 185,458	$ 246,479
Loans and leases, net of unearned discount	$ 89,448	$ 182,880	$ 199,918
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	50	99	161
Pre-modification Recorded Investment	$ 34,972	$ 202,878	$ 310,578
Loans and leases, net of unearned discount	$ 34,618	$ 200,837	$ 295,231
Other Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	1	3	2
Pre-modification Recorded Investment	$ 100	$ 542	$ 13,602
Loans and leases, net of unearned discount	$ 100	$ 532	$ 13,573
Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	274	373	631
Pre-modification Recorded Investment	$ 71,165	$ 108,325	$ 202,985
Loans and leases, net of unearned discount	$ 73,541	$ 108,635	$ 207,517
Residential Limited Documentation [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	8	21	30
Pre-modification Recorded Investment	$ 1,398	$ 2,920	$ 7,413
Loans and leases, net of unearned discount	$ 1,409	$ 2,865	$ 8,332
Home Equity Lines and Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	144	89	259
Pre-modification Recorded Investment	$ 10,146	$ 6,430	$ 17,228
Loans and leases, net of unearned discount	$ 10,213	$ 6,375	$ 17,254
Recreational Finance [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	729	281	428
Pre-modification Recorded Investment	$ 27,517	$ 9,931	$ 16,392
Loans and leases, net of unearned discount	$ 27,510	$ 9,931	$ 16,392
Automobile [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	2,092	807	2,249
Pre-modification Recorded Investment	$ 41,540	$ 14,668	$ 39,951
Loans and leases, net of unearned discount	$ 41,510	$ 14,668	$ 39,951
Other [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	149	362	1,095
Pre-modification Recorded Investment	$ 1,426	$ 2,597	$ 7,788
Loans and leases, net of unearned discount	$ 1,426	$ 2,597	$ 7,788
Residential Builder and Developer [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications | Modification	1	1	1
Pre-modification Recorded Investment	$ 60	$ 3	$ 91
Loans and leases, net of unearned discount	57	3	90
Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	202,866	246,598	545,415
Principal Deferral [Member] | Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	53,219	46,806	70,671
Principal Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	14,037	67,387	204,591
Principal Deferral [Member] | Other Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount		532	13,573
Principal Deferral [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	54,519	95,769	183,878
Principal Deferral [Member] | Residential Limited Documentation [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	1,216	2,865	7,100
Principal Deferral [Member] | Home Equity Lines and Loans [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	9,372	6,054	5,882
Principal Deferral [Member] | Recreational Finance [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	27,510	9,931	16,388
Principal Deferral [Member] | Automobile [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	41,510	14,654	39,949
Principal Deferral [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	1,426	2,597	3,383
Principal Deferral [Member] | Residential Builder and Developer [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	57	3
Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	455		803
Interest Rate Reduction [Member] | Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	455		298
Interest Rate Reduction [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount			505
Other [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	3,206	71,760	36,479
Other [Member] | Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	983	40,558	31,605
Other [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	2,223	31,202	4,874
Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	73,305	210,965	223,349
Combination of Concession Types [Member] | Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	34,791	95,516	97,344
Combination of Concession Types [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	18,358	102,248	85,261
Combination of Concession Types [Member] | Other Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	100
Combination of Concession Types [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	19,022	12,866	23,639
Combination of Concession Types [Member] | Residential Limited Documentation [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	193		1,232
Combination of Concession Types [Member] | Home Equity Lines and Loans [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	$ 841	321	11,372
Combination of Concession Types [Member] | Recreational Finance [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount			4
Combination of Concession Types [Member] | Automobile [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount		$ 14	2
Combination of Concession Types [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount			4,405
Combination of Concession Types [Member] | Residential Builder and Developer [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount			$ 90