Allowance for Loan Losses Activity in the allowance for loan losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$ 10,863	$ 9,133	$ 5,093
Financing Receivable, Allowance for Credit Losses, Recovery	5,942	6,758	8,441
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	4,921	2,375	(3,348)
Financing Receivable, Credit Loss, Expense (Reversal)	2,904	4,557	(11,916)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	83,745	85,379	83,197	$ 85,675
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		383		6,090
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	1,226	2,056	957
Financing Receivable, Allowance for Credit Losses, Recovery	292	826	639
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	934	1,230	318
Financing Receivable, Credit Loss, Expense (Reversal)	(779)	4,192	(3,008)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	15,496	16,987	14,025	25,608
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		222		(8,257)
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	754	1,578	35
Financing Receivable, Allowance for Credit Losses, Recovery	240	627	802
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	514	951	(767)
Financing Receivable, Credit Loss, Expense (Reversal)	(1,122)	(6,686)	(900)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	16,374	17,829	25,466	23,480
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		181		2,119
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	546	33	0
Financing Receivable, Allowance for Credit Losses, Recovery	548	1,343	2,299
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(2)	(1,310)	(2,299)
Financing Receivable, Credit Loss, Expense (Reversal)	(325)	(1,518)	(1,931)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	5,227	5,550	5,758	7,288
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		0		(1,898)
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	44	81	49
Financing Receivable, Allowance for Credit Losses, Recovery	482	164	941
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(438)	(83)	(892)
Financing Receivable, Credit Loss, Expense (Reversal)	1,569	5,324	(3,952)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	18,818	16,831	11,424	11,363
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		(20)		3,121
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	8,293	5,343	4,052
Financing Receivable, Allowance for Credit Losses, Recovery	4,379	3,767	3,759
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	3,914	1,576	293
Financing Receivable, Credit Loss, Expense (Reversal)	3,606	3,311	(1,764)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	27,713	28,021	26,286	17,418
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		0		10,925
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	0	42	0
Financing Receivable, Allowance for Credit Losses, Recovery	1	31	1
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1)	11	(1)
Financing Receivable, Credit Loss, Expense (Reversal)	(45)	(66)	(361)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 117	161	$ 238	518
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		$ 0		$ 80