Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	$ 2,576		$ 1,961
Ending balance: pooled	85,214		83,671
Financing Receivable, Allowance for Credit Loss	87,790	$ 87,091	85,632	$ 85,387
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	10,606		19,686
Ending balance: pooled	6,822,431		6,559,400
Total Loans and Leases Held for Investment	6,833,037	6,826,583	6,579,086
Commercial, financial and agricultural
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	2,343		1,429
Ending balance: pooled	15,184		12,503
Financing Receivable, Allowance for Credit Loss	17,527	16,079	13,932	13,699
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	4,244		3,376
Ending balance: pooled	1,030,117		1,011,192
Total Loans and Leases Held for Investment	1,034,361	1,037,835	1,014,568
Real estate-commercial
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	166		18
Ending balance: pooled	47,000		45,835
Financing Receivable, Allowance for Credit Loss	47,166	46,867	45,853	45,849
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	3,526		3,721
Ending balance: pooled	3,542,876		3,280,008
Total Loans and Leases Held for Investment	3,546,402	3,530,451	3,283,729
Real estate-construction
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		514
Ending balance: pooled	4,750		5,740
Financing Receivable, Allowance for Credit Loss	4,750	4,924	6,254	6,543
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		5,738
Ending balance: pooled	281,785		374,257
Total Loans and Leases Held for Investment	281,785	274,483	379,995
Real estate-residential secured for business purpose
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	7,507		8,800
Financing Receivable, Allowance for Credit Loss	7,507	7,491	8,800	8,692
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	449		1,719
Ending balance: pooled	535,633		522,477
Total Loans and Leases Held for Investment	536,082	536,095	524,196
Residential secured for personal purpose
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	6,394		6,637
Financing Receivable, Allowance for Credit Loss	6,394	7,222	6,637	6,349
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,232		3,846
Ending balance: pooled	991,535		918,566
Total Loans and Leases Held for Investment	992,767	994,972	922,412
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	1,566		1,184
Financing Receivable, Allowance for Credit Loss	1,566	1,706	1,184	1,289
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,088		1,286
Ending balance: pooled	188,031		176,160
Total Loans and Leases Held for Investment	189,119	186,836	177,446
Loans to individuals
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	328		388
Financing Receivable, Allowance for Credit Loss	328	342	388	392
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	16,930		27,200
Total Loans and Leases Held for Investment	16,930	21,250	27,200
Lease financings
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	67		0
Ending balance: pooled	2,485		2,584
Financing Receivable, Allowance for Credit Loss	2,552	2,460	2,584	$ 2,574
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	67		0
Ending balance: pooled	235,524		249,540
Total Loans and Leases Held for Investment	$ 235,591	$ 244,661	$ 249,540

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

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Amount of allowance for credit loss on financing receivable evaluated on collective basis. Excludes financing receivable evaluated on individual basis.

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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