Loans and Leases - Allowance for Credit Losses, Loans and Leases, Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 85,632	$ 80,034	$ 85,387	$ 79,004
Provision for credit losses	922	3,187	2,573	7,059
Charge-offs	(1,169)	(600)	(2,771)	(3,830)
Recoveries	360	88	556	476
Ending balance	85,745	82,709	85,745	82,709
Commercial, financial and agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,932	14,725	13,699	16,920
Provision for credit losses	1,448	(589)	2,263	(42)
Charge-offs	(920)	(299)	(1,513)	(3,147)
Recoveries	85	34	96	140
Ending balance	14,545	13,871	14,545	13,871
Real estate-commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	45,853	43,150	45,849	41,673
Provision for credit losses	121	1,604	122	3,128
Charge-offs	0	0	0	(50)
Recoveries	4	3	7	6
Ending balance	45,978	44,757	45,978	44,757
Real estate-construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,254	4,681	6,543	4,952
Provision for credit losses	(101)	752	110	688
Charge-offs	0	0	(500)	(207)
Recoveries	0	0	0	0
Ending balance	6,153	5,433	6,153	5,433
Real estate-residential secured for business purpose
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,800	8,360	8,692	7,054
Provision for credit losses	(1,294)	336	(1,188)	1,461
Charge-offs	0	0	0	0
Recoveries	233	0	235	181
Ending balance	7,739	8,696	7,739	8,696
Residential secured for personal purpose
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,637	5,012	6,349	3,685
Provision for credit losses	(31)	576	123	1,903
Charge-offs	0	0	0	0
Recoveries	0	0	134	0
Ending balance	6,606	5,588	6,606	5,588
Real estate-home equity secured for personal purpose
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,184	1,271	1,289	1,287
Provision for credit losses	504	110	399	44
Charge-offs	0	(85)	0	(85)
Recoveries	0	0	0	50
Ending balance	1,688	1,296	1,688	1,296
Loans to individuals
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	388	375	392	351
Provision for credit losses	70	262	305	375
Charge-offs	(127)	(111)	(406)	(216)
Recoveries	17	34	57	50
Ending balance	348	560	348	560
Lease financings
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,584	2,460	2,574	3,082
Provision for credit losses	205	136	439	(498)
Charge-offs	(122)	(105)	(352)	(125)
Recoveries	21	17	27	49
Ending balance	$ 2,688	$ 2,508	$ 2,688	$ 2,508