Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	$ 2,808			$ 456
Ending balance: pooled	84,181			85,289
Financing Receivable, Allowance for Credit Loss	86,989	$ 87,790	$ 87,091	85,745	$ 85,632	$ 85,387
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	27,468			15,748
Ending balance: pooled	6,773,717			6,669,089
Total Loans and Leases Held for Investment	6,801,185		6,826,583	6,684,837
Commercial, financial and agricultural
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	2,541			433
Ending balance: pooled	14,438			14,112
Financing Receivable, Allowance for Credit Loss	16,979	17,527	16,079	14,545	13,932	13,699
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	6,904			2,237
Ending balance: pooled	1,045,342			1,053,095
Total Loans and Leases Held for Investment	1,052,246		1,037,835	1,055,332
Real estate-commercial
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	151			23
Ending balance: pooled	46,187			45,955
Financing Receivable, Allowance for Credit Loss	46,338	47,166	46,867	45,978	45,853	45,849
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	15,661			4,140
Ending balance: pooled	3,469,954			3,369,749
Total Loans and Leases Held for Investment	3,485,615		3,530,451	3,373,889
Real estate-construction
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	5,253			6,153
Financing Receivable, Allowance for Credit Loss	5,253	4,750	4,924	6,153	6,254	6,543
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0			3,523
Ending balance: pooled	302,424			309,706
Total Loans and Leases Held for Investment	302,424		274,483	313,229
Real estate-residential secured for business purpose
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	7,468			7,739
Financing Receivable, Allowance for Credit Loss	7,468	7,507	7,491	7,739	8,800	8,692
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	2,349			822
Ending balance: pooled	532,861			531,806
Total Loans and Leases Held for Investment	535,210		536,095	532,628
Residential secured for personal purpose
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	6,451			6,606
Financing Receivable, Allowance for Credit Loss	6,451	6,394	7,222	6,606	6,637	6,349
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,184			3,818
Ending balance: pooled	982,982			948,847
Total Loans and Leases Held for Investment	984,166		994,972	952,665
Real estate-home equity secured for personal purpose
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	1,609			1,688
Financing Receivable, Allowance for Credit Loss	1,609	1,566	1,706	1,688	1,184	1,289
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,254			1,193
Ending balance: pooled	193,760			177,957
Total Loans and Leases Held for Investment	195,014		186,836	179,150
Loans to individuals
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	344			348
Financing Receivable, Allowance for Credit Loss	344	328	342	348	388	392
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0			15
Ending balance: pooled	14,069			26,415
Total Loans and Leases Held for Investment	14,069		21,250	26,430
Lease financings
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	116			0
Ending balance: pooled	2,431			2,688
Financing Receivable, Allowance for Credit Loss	2,547	$ 2,552	2,460	2,688	$ 2,584	$ 2,574
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	116			0
Ending balance: pooled	232,325			251,514
Total Loans and Leases Held for Investment	$ 232,441		$ 244,661	$ 251,514