A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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Loans and Leases - Allowance for Credit Losses, Loans and Leases Roll Forward (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2021	Jan. 01, 2020	Jan. 01, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 83,044	$ 35,331	$ 29,364
Allowance for credit losses, loans and leases	71,924	83,044	35,331
(Reversal of provision) provision for credit losses	(10,907)	39,439	8,518
Charge-offs	(3,013)	(5,899)	(3,463)
Recoveries	2,800	1,251	912
Ending balance	71,924	83,044	35,331
Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				$ 0	$ 12,922	$ 0
Commercial, Financial and Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,584	8,759	7,983
Allowance for credit losses, loans and leases	13,536	13,584	8,759
(Reversal of provision) provision for credit losses	(32)	680	2,374
Charge-offs	(1,641)	(1,884)	(1,965)
Recoveries	1,625	745	367
Ending balance	13,536	13,584	8,759
Commercial, Financial and Agricultural [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				0	5,284	0
Paycheck Protection Program Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0
Allowance for credit losses, loans and leases	2	0
(Reversal of provision) provision for credit losses	2
Charge-offs	0
Recoveries	0
Ending balance	2	0
Paycheck Protection Program Loans [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				0
Real Estate-Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	52,230	15,750
Allowance for credit losses, loans and leases	41,095	52,230	15,750
(Reversal of provision) provision for credit losses	(11,339)	33,090
Charge-offs	(594)	(2,853)
Recoveries	798	35
Ending balance	41,095	52,230	15,750
Real Estate-Commercial [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				0	6,208
Real Estate-Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,298	2,446
Allowance for credit losses, loans and leases	4,575	3,298	2,446
(Reversal of provision) provision for credit losses	1,277	823
Charge-offs	0	0
Recoveries	0	0
Ending balance	4,575	3,298	2,446
Real Estate-Construction [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				0	29
Real Estate-Commercial and Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		18,196	13,903
Allowance for credit losses, loans and leases			18,196
(Reversal of provision) provision for credit losses			4,602
Charge-offs			(402)
Recoveries			93
Ending balance			18,196
Real Estate-Commercial and Construction [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases						0
Real Estate-Residential Secured for Business Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,317	2,622	2,236
Allowance for credit losses, loans and leases	6,482	7,317	2,622
(Reversal of provision) provision for credit losses	(688)	2,306	396
Charge-offs	(227)	(188)	(122)
Recoveries	80	75	112
Ending balance	6,482	7,317	2,622
Real Estate-Residential Secured for Business Purpose [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				0	2,502	0
Real Estate-Residential Secured for Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,055	2,713
Allowance for credit losses, loans and leases	2,403	3,055	2,713
(Reversal of provision) provision for credit losses	(652)	1,229
Charge-offs	0	(181)
Recoveries	0	0
Ending balance	2,403	3,055	2,713
Real Estate-Residential Secured for Personal Purpose [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				0	(706)
Real Estate-Home Equity Secured for Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,176	1,076
Allowance for credit losses, loans and leases	1,028	1,176	1,076
(Reversal of provision) provision for credit losses	(212)	449
Charge-offs	0	0
Recoveries	64	15
Ending balance	1,028	1,176	1,076
Real Estate-Home Equity Secured for Personal Purpose [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				0	(364)
Real Estate-Residential and Home Equity Secured for Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		3,789	3,199
Allowance for credit losses, loans and leases			3,789
(Reversal of provision) provision for credit losses			781
Charge-offs			(212)
Recoveries			21
Ending balance			3,789
Real Estate-Residential and Home Equity Secured for Personal Purpose [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases						0
Loans to Individuals [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	533	470	484
Allowance for credit losses, loans and leases	363	533	470
(Reversal of provision) provision for credit losses	(35)	146	246
Charge-offs	(240)	(267)	(335)
Recoveries	105	80	75
Ending balance	363	533	470
Loans to Individuals [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				0	104	0
Lease Financings [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,701	1,311	1,288
Allowance for credit losses, loans and leases	2,290	1,701	1,311
(Reversal of provision) provision for credit losses	772	750	206
Charge-offs	(311)	(526)	(427)
Recoveries	128	301	244
Ending balance	2,290	1,701	1,311
Lease Financings [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				0	(135)	0
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	150	184	271
Allowance for credit losses, loans and leases	150	150	184
(Reversal of provision) provision for credit losses	0	(34)	(87)
Ending balance	$ 150	$ 150	$ 184
Unallocated [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and leases				$ 0	$ 0	$ 0