Loans and Leases - Allowance for Credit Losses, Loans and Leases, Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 86,989	$ 85,745	$ 87,091	$ 85,387
Provision for credit losses	18	1,116	9,409	3,689
Charge-offs	(1,050)	(950)	(11,239)	(3,721)
Recoveries	570	130	1,266	686
Ending balance	86,527	86,041	86,527	86,041
Commercial, financial and agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,979	14,545	16,079	13,699
Provision for credit losses	(331)	544	9,321	2,807
Charge-offs	(625)	(508)	(10,019)	(2,021)
Recoveries	525	108	1,167	204
Ending balance	16,548	14,689	16,548	14,689
Real estate-commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	46,338	45,978	46,867	45,849
Provision for credit losses	(506)	688	(1,022)	810
Charge-offs	0	(35)	(20)	(35)
Recoveries	24	3	31	10
Ending balance	45,856	46,634	45,856	46,634
Real estate-construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,253	6,153	4,924	6,543
Provision for credit losses	133	(611)	462	(501)
Charge-offs	0	0	0	(500)
Recoveries	0	0	0	0
Ending balance	5,386	5,542	5,386	5,542
Real estate-residential secured for business purpose
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,468	7,739	7,491	8,692
Provision for credit losses	104	(89)	81	(1,277)
Charge-offs	0	0	0	0
Recoveries	0	0	0	235
Ending balance	7,572	7,650	7,572	7,650
Residential secured for personal purpose
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,451	6,606	7,222	6,349
Provision for credit losses	21	287	(757)	410
Charge-offs	(42)	0	(42)	0
Recoveries	0	0	7	134
Ending balance	6,430	6,893	6,430	6,893
Real estate-home equity secured for personal purpose
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,609	1,688	1,706	1,289
Provision for credit losses	6	7	(91)	406
Charge-offs	0	0	0	0
Recoveries	1	0	1	0
Ending balance	1,616	1,695	1,616	1,695
Loans to individuals
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	344	348	342	392
Provision for credit losses	217	304	550	609
Charge-offs	(231)	(324)	(584)	(730)
Recoveries	18	12	40	69
Ending balance	348	340	348	340
Lease financings
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,547	2,688	2,460	2,574
Provision for credit losses	374	(14)	865	425
Charge-offs	(152)	(83)	(574)	(435)
Recoveries	2	7	20	34
Ending balance	$ 2,771	$ 2,598	$ 2,771	$ 2,598

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

+ References

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- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ References

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- Definition

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

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- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

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