Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	$ 1,961		$ 912
Ending balance: pooled	83,671		79,122
Financing Receivable, Allowance for Credit Loss	85,632	$ 85,387	80,034	$ 79,004
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	19,686		11,301
Ending balance: pooled	6,559,400		6,228,503
Total Loans and Leases Held for Investment	6,579,086	6,567,214	6,239,804
Commercial, financial and agricultural
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	1,429		912
Ending balance: pooled	12,503		13,813
Financing Receivable, Allowance for Credit Loss	13,932	13,699	14,725	16,920
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	3,376		3,423
Ending balance: pooled	1,011,192		1,029,330
Total Loans and Leases Held for Investment	1,014,568	989,723	1,032,753
Real estate-commercial
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	18		0
Ending balance: pooled	45,835		43,150
Financing Receivable, Allowance for Credit Loss	45,853	45,849	43,150	41,673
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	3,721		4,288
Ending balance: pooled	3,280,008		3,123,922
Total Loans and Leases Held for Investment	3,283,729	3,302,798	3,128,210
Real estate-construction
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	514		0
Ending balance: pooled	5,740		4,681
Financing Receivable, Allowance for Credit Loss	6,254	6,543	4,681	4,952
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	5,738		383
Ending balance: pooled	374,257		376,186
Total Loans and Leases Held for Investment	379,995	394,462	376,569
Real estate-residential secured for business purpose
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	8,800		8,360
Financing Receivable, Allowance for Credit Loss	8,800	8,692	8,360	7,054
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,719		759
Ending balance: pooled	522,477		497,746
Total Loans and Leases Held for Investment	524,196	517,002	498,505
Residential secured for personal purpose
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	6,637		5,012
Financing Receivable, Allowance for Credit Loss	6,637	6,349	5,012	3,685
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	3,846		1,500
Ending balance: pooled	918,566		778,057
Total Loans and Leases Held for Investment	922,412	909,015	779,557
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	1,184		1,271
Financing Receivable, Allowance for Credit Loss	1,184	1,289	1,271	1,287
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,286		948
Ending balance: pooled	176,160		171,125
Total Loans and Leases Held for Investment	177,446	179,282	172,073
Loans to individuals
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	388		375
Financing Receivable, Allowance for Credit Loss	388	392	375	351
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	27,200		28,656
Total Loans and Leases Held for Investment	27,200	27,749	28,656
Lease financings
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	2,584		2,460
Financing Receivable, Allowance for Credit Loss	2,584	2,574	2,460	$ 3,082
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	249,540		223,481
Total Loans and Leases Held for Investment	$ 249,540	$ 247,183	$ 223,481

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
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Amount of allowance for credit loss on financing receivable evaluated on individual basis. Excludes financing receivable evaluated on collective basis.

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Amount of financing receivable collectively evaluated for credit loss. Excludes financing receivable individually evaluated for credit loss.

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Amount of financing receivable individually evaluated for credit loss. Excludes financing receivable collectively evaluated for credit loss.

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

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Reserve for loan and lease losses.

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