Loans and Leases - Allowance for Credit Losses, Loans and Leases, Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 71,924	$ 83,044
Provision (reversal of provision) for loan and lease losses	(3,562)	11,259
Charge-offs	(348)	(485)
Recoveries	272	197
Ending balance	68,286	71,497
Commercial Financial And Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,536	13,584
Provision (reversal of provision) for loan and lease losses	1,671	(3,078)
Charge-offs	(214)	(338)
Recoveries	189	65
Ending balance	11,840	10,233
Paycheck Protection Program Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2
Provision (reversal of provision) for loan and lease losses	(1)
Charge-offs	0
Recoveries	0
Ending balance	1	0
Real-Estate Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	41,095	52,230
Provision (reversal of provision) for loan and lease losses	(669)	6,771
Charge-offs	0	0
Recoveries	0	0
Ending balance	40,426	45,459
Real-Estate Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,575	3,298
Provision (reversal of provision) for loan and lease losses	941	499
Charge-offs	0	0
Recoveries	0	0
Ending balance	3,634	2,799
Real Estate Residential Secured For Business Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,482	7,317
Provision (reversal of provision) for loan and lease losses	(328)	679
Charge-offs	0	0
Recoveries	48	54
Ending balance	6,202	6,692
Real Estate Residential Secured For Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,403	3,055
Provision (reversal of provision) for loan and lease losses	189	(1)
Charge-offs	0	0
Recoveries	0	0
Ending balance	2,592	3,056
Real Estate Home Equity Secured For Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,028	1,176
Provision (reversal of provision) for loan and lease losses	(53)	(79)
Charge-offs	0	0
Recoveries	1	2
Ending balance	976	1,257
Loans to Individuals [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	363	533
Provision (reversal of provision) for loan and lease losses	(57)	(58)
Charge-offs	(75)	(56)
Recoveries	24	28
Ending balance	369	447
Lease Financings [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,290	1,701
Provision (reversal of provision) for loan and lease losses	(5)	(254)
Charge-offs	(59)	(91)
Recoveries	10	48
Ending balance	2,246	1,404
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	150	150
Provision (reversal of provision) for loan and lease losses	(150)	0
Ending balance	$ 0	$ 150

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

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

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

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

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