Loans and Leases - Allowance for Credit Losses, Loans and Leases, Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 87,790	$ 85,632	$ 87,091	$ 85,387
Provision for credit losses	7,006	922	9,391	2,573
Charge-offs	(8,158)	(1,169)	(10,189)	(2,771)
Recoveries	351	360	696	556
Ending balance	86,989	85,745	86,989	85,745
Commercial, financial and agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	17,527	13,932	16,079	13,699
Provision for credit losses	6,973	1,448	9,652	2,263
Charge-offs	(7,837)	(920)	(9,394)	(1,513)
Recoveries	316	85	642	96
Ending balance	16,979	14,545	16,979	14,545
Real estate-commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	47,166	45,853	46,867	45,849
Provision for credit losses	(831)	121	(516)	122
Charge-offs	0	0	(20)	0
Recoveries	3	4	7	7
Ending balance	46,338	45,978	46,338	45,978
Real estate-construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,750	6,254	4,924	6,543
Provision for credit losses	503	(101)	329	110
Charge-offs	0	0	0	(500)
Recoveries	0	0	0	0
Ending balance	5,253	6,153	5,253	6,153
Real estate-residential secured for business purpose
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,507	8,800	7,491	8,692
Provision for credit losses	(39)	(1,294)	(23)	(1,188)
Charge-offs	0	0	0	0
Recoveries	0	233	0	235
Ending balance	7,468	7,739	7,468	7,739
Residential secured for personal purpose
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,394	6,637	7,222	6,349
Provision for credit losses	50	(31)	(778)	123
Charge-offs	0	0	0	0
Recoveries	7	0	7	134
Ending balance	6,451	6,606	6,451	6,606
Real estate-home equity secured for personal purpose
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,566	1,184	1,706	1,289
Provision for credit losses	43	504	(97)	399
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	1,609	1,688	1,609	1,688
Loans to individuals
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	328	388	342	392
Provision for credit losses	189	70	333	305
Charge-offs	(188)	(127)	(353)	(406)
Recoveries	15	17	22	57
Ending balance	344	348	344	348
Lease financings
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,552	2,584	2,460	2,574
Provision for credit losses	118	205	491	439
Charge-offs	(133)	(122)	(422)	(352)
Recoveries	10	21	18	27
Ending balance	$ 2,547	$ 2,688	$ 2,547	$ 2,688