Allowance for Loan Losses Activity in the allowance for loan losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 83,197	$ 85,675	$ 56,679	$ 51,512
Financing Receivable, Allowance for Credit Losses, Write-downs	5,093	10,304	11,177
Financing Receivable, Allowance for Credit Losses, Recovery	8,441	27,246	10,173
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(3,348)	16,942	(1,004)
Financing Receivable, Credit Loss, Expense (Reversal)	(11,916)	12,054	6,171
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss		6,090
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	14,025	25,608	20,203	16,777
Financing Receivable, Allowance for Credit Losses, Write-downs	957	1,468	2,231
Financing Receivable, Allowance for Credit Losses, Recovery	639	20,765	1,241
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	318	19,297	(990)
Financing Receivable, Credit Loss, Expense (Reversal)	(3,008)	(13,892)	4,416
Commercial Financial And Agricultural [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss		(8,257)
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	25,466	23,480	10,229	9,768
Financing Receivable, Allowance for Credit Losses, Write-downs	35	1,824	400
Financing Receivable, Allowance for Credit Losses, Recovery	802	738	720
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(767)	(1,086)	320
Financing Receivable, Credit Loss, Expense (Reversal)	(900)	14,337	141
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss		2,119
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	5,758	7,288	5,311	4,463
Financing Receivable, Allowance for Credit Losses, Write-downs	0	6	0
Financing Receivable, Allowance for Credit Losses, Recovery	2,299	1,122	2,682
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(2,299)	1,116	2,682
Financing Receivable, Credit Loss, Expense (Reversal)	(1,931)	861	(1,834)
Construction Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss		(1,898)
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	11,424	11,363	8,610	8,731
Financing Receivable, Allowance for Credit Losses, Write-downs	49	356	239
Financing Receivable, Allowance for Credit Losses, Recovery	941	991	787
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(892)	635	548
Financing Receivable, Credit Loss, Expense (Reversal)	(3,952)	2,118	(669)
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss		3,121
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	26,286	17,418	12,211	11,773
Financing Receivable, Allowance for Credit Losses, Write-downs	4,052	6,634	8,307
Financing Receivable, Allowance for Credit Losses, Recovery	3,759	3,629	4,742
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	293	(3,005)	(3,565)
Financing Receivable, Credit Loss, Expense (Reversal)	(1,764)	8,212	4,003
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss		10,925
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	238	518	115	$ 0
Financing Receivable, Allowance for Credit Losses, Write-downs	0	16	0
Financing Receivable, Allowance for Credit Losses, Recovery	1	1	1
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1)	(15)	1
Financing Receivable, Credit Loss, Expense (Reversal)	$ (361)	418	$ 114
Finance Leases Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 80