Allowance for Loan Losses Activity in the allowance for loan losses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$ 9,133	$ 5,093	$ 10,304
Financing Receivable, Allowance for Credit Losses, Recovery	6,758	8,441	27,246
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	2,375	(3,348)	16,942
Financing Receivable, Credit Loss, Expense (Reversal)	4,557	(11,916)	12,054
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	85,379	83,197	85,675	$ 56,679
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		6,090	6,090
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	2,056	957	1,468
Financing Receivable, Allowance for Credit Losses, Recovery	826	639	20,765
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	1,230	318	19,297
Financing Receivable, Credit Loss, Expense (Reversal)	4,192	(3,008)	(13,892)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	16,987	14,025	25,608	20,203
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, Excluding Accrued Interest		(8,257)
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	1,578	35	1,824
Financing Receivable, Allowance for Credit Losses, Recovery	627	802	738
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	951	(767)	(1,086)
Financing Receivable, Credit Loss, Expense (Reversal)	(6,686)	(900)	14,337
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	17,829	25,466	23,480	10,229
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, Excluding Accrued Interest		2,119
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	33	0	6
Financing Receivable, Allowance for Credit Losses, Recovery	1,343	2,299	1,122
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1,310)	(2,299)	1,116
Financing Receivable, Credit Loss, Expense (Reversal)	(1,518)	(1,931)	861
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	5,550	5,758	7,288	5,311
Construction Real Estate [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		(1,898)
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	81	49	356
Financing Receivable, Allowance for Credit Losses, Recovery	164	941	991
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(83)	(892)	635
Financing Receivable, Credit Loss, Expense (Reversal)	5,324	(3,952)	2,118
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	16,831	11,424	11,363	8,610
Residential Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		3,121
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	5,343	4,052	6,634
Financing Receivable, Allowance for Credit Losses, Recovery	3,767	3,759	3,629
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	1,576	293	(3,005)
Financing Receivable, Credit Loss, Expense (Reversal)	3,311	(1,764)	8,212
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	28,021	26,286	17,418	12,211
Consumer Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		10,925
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	42	0	16
Financing Receivable, Allowance for Credit Losses, Recovery	31	1	1
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	11	(1)	(15)
Financing Receivable, Credit Loss, Expense (Reversal)	(66)	(361)	418
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 161	238	$ 518	$ 115
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, Excluding Accrued Interest		$ 80

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
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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 credit loss expense (reversal of expense) for financing receivable.

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