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 allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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

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Loans and Leases - Reserve for Credit Losses, Loan and Leases, Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 68,216	$ 31,602	$ 35,331	$ 29,364
Allowance for credit losses, loans and lease	86,217		86,217		$ 35,331
Provision for credit losses	21,577	2,076	42,029	4,761
Charge-offs	(3,947)	(1,216)	(4,618)	(1,925)
Recoveries	371	138	553	400
Ending balance	86,217	32,600	86,217	32,600
Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					12,922
Commercial Financial And Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,244	8,950	8,759	7,983
Allowance for credit losses, loans and lease					8,759
Provision for credit losses	(2,034)	1,178	3,596	2,531
Charge-offs	(744)	(1,018)	(1,225)	(1,486)
Recoveries	270	19	322	101
Ending balance	16,736	9,129	16,736	9,129
Commercial Financial And Agricultural [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					5,284
Real-Estate Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	34,810		15,750
Allowance for credit losses, loans and lease					15,750
Provision for credit losses	18,663		31,480
Charge-offs	(2,802)		(2,802)
Recoveries	0		35
Ending balance	50,671		50,671
Real-Estate Commercial [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					6,208
Real-Estate Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,117		2,446
Allowance for credit losses, loans and lease					2,446
Provision for credit losses	1,013		1,655
Charge-offs	0		0
Recoveries	0		0
Ending balance	4,130		4,130
Real-Estate Construction [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					29
Real Estate Commercial And Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		14,981		13,903
Provision for credit losses		530		1,558
Charge-offs		(33)		(74)
Recoveries		0		91
Ending balance		15,478		15,478
Real Estate Residential Secured For Business Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,906	2,302	2,622	2,236
Allowance for credit losses, loans and lease					2,622
Provision for credit losses	2,365	170	3,147	232
Charge-offs	(96)	0	(99)	0
Recoveries	5	6	8	10
Ending balance	8,180	2,478	8,180	2,478
Real Estate Residential Secured For Business Purpose [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					2,502
Real Estate Residential Secured For Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,121		2,713
Allowance for credit losses, loans and lease					2,713
Provision for credit losses	548		662
Charge-offs	0		0
Recoveries	0		0
Ending balance	2,669		2,669
Real Estate Residential Secured For Personal Purpose [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					(706)
Real Estate Home Equity Secured For Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	795		1,076
Allowance for credit losses, loans and lease					1,076
Provision for credit losses	273		351
Charge-offs	0		0
Recoveries	3		8
Ending balance	1,071		1,071
Real Estate Home Equity Secured For Personal Purpose [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					(364)
Residential And Home Equity Secured For Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		3,379		3,199
Provision for credit losses		136		322
Charge-offs		(4)		(15)
Recoveries		7		12
Ending balance		3,518		3,518
Loans to Individuals [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	600	469	470	484
Allowance for credit losses, loans and lease					470
Provision for credit losses	239	47	286	95
Charge-offs	(93)	(51)	(128)	(136)
Recoveries	25	16	39	38
Ending balance	771	481	771	481
Loans to Individuals [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					104
Lease Financings [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,473	1,275	1,311	1,288
Allowance for credit losses, loans and lease					1,311
Provision for credit losses	510	(14)	886	19
Charge-offs	(212)	(110)	(364)	(214)
Recoveries	68	90	141	148
Ending balance	1,839	1,241	1,839	1,241
Lease Financings [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					(135)
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	150	246	184	271
Allowance for credit losses, loans and lease					184
Provision for credit losses	0	29	(34)	4
Ending balance	$ 150	$ 275	$ 150	$ 275
Unallocated [Member] \| Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, loans and lease					$ 0