Loans and Leases - Allowance for Credit Losses, Loans and Leases, Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Jan. 01, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 83,044	$ 35,331
Less: Allowance for credit losses, loans and leases	71,497	68,216
(Reversal of provision) provision for credit losses	(11,259)	20,452
Charge-offs	(485)	(671)
Recoveries	197	182
Ending balance	71,497	68,216
Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		12,922	$ 0
Ending balance		12,922
Commercial Financial And Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,584	8,759
Less: Allowance for credit losses, loans and leases	10,233	19,244
(Reversal of provision) provision for credit losses	(3,078)	5,630
Charge-offs	(338)	(481)
Recoveries	65	52
Ending balance	10,233	19,244
Commercial Financial And Agricultural [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		5,284	0
Ending balance		5,284
Real-Estate Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	52,230	15,750
Less: Allowance for credit losses, loans and leases	45,459	34,810
(Reversal of provision) provision for credit losses	(6,771)	12,817
Charge-offs	0	0
Recoveries	0	35
Ending balance	45,459	34,810
Real-Estate Commercial [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		6,208	0
Ending balance		6,208
Real-Estate Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,298	2,446
Less: Allowance for credit losses, loans and leases	2,799	3,117
(Reversal of provision) provision for credit losses	(499)	642
Charge-offs	0	0
Recoveries	0	0
Ending balance	2,799	3,117
Real-Estate Construction [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		29	0
Ending balance		29
Real Estate Residential Secured For Business Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,317	2,622
Less: Allowance for credit losses, loans and leases	6,692	5,906
(Reversal of provision) provision for credit losses	(679)	782
Charge-offs	0	(3)
Recoveries	54	3
Ending balance	6,692	5,906
Real Estate Residential Secured For Business Purpose [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		2,502	0
Ending balance		2,502
Real Estate Residential Secured For Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,055	2,713
Less: Allowance for credit losses, loans and leases	3,056	2,121
(Reversal of provision) provision for credit losses	1	114
Charge-offs	0	0
Recoveries	0	0
Ending balance	3,056	2,121
Real Estate Residential Secured For Personal Purpose [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		(706)	0
Ending balance		(706)
Real Estate Home Equity Secured For Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,176	1,076
Less: Allowance for credit losses, loans and leases	1,257	795
(Reversal of provision) provision for credit losses	79	78
Charge-offs	0	0
Recoveries	2	5
Ending balance	1,257	795
Real Estate Home Equity Secured For Personal Purpose [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		(364)	0
Ending balance		(364)
Loans to Individuals [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	533	470
Less: Allowance for credit losses, loans and leases	447	600
(Reversal of provision) provision for credit losses	(58)	47
Charge-offs	(56)	(35)
Recoveries	28	14
Ending balance	447	600
Loans to Individuals [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		104	0
Ending balance		104
Lease Financings [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,701	1,311
Less: Allowance for credit losses, loans and leases	1,404	1,473
(Reversal of provision) provision for credit losses	(254)	376
Charge-offs	(91)	(152)
Recoveries	48	73
Ending balance	1,404	1,473
Lease Financings [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		(135)	0
Ending balance		(135)
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	150	184
Less: Allowance for credit losses, loans and leases	150	150
(Reversal of provision) provision for credit losses	0	(34)
Ending balance	$ 150	150
Unallocated [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Less: Allowance for credit losses, loans and leases		0	$ 0
Ending balance		$ 0

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

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