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Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	$ 834			$ 1,657
Ending balance: pooled	83,003			73,272
Financing Receivable, Allowance for Credit Loss	83,837	$ 82,709	$ 79,004	74,929	$ 72,011	$ 71,924
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	12,552			13,556
Ending balance: pooled	6,562,406			5,835,703
Loans measured at fair value	0			0
Total loans and leases held for investment	6,574,958		6,123,230	5,849,259
Commercial Financial And Agricultural [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	814			1,407
Ending balance: pooled	13,322			13,578
Financing Receivable, Allowance for Credit Loss	14,136	13,871	16,920	14,985	13,004	13,538
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,754			2,630
Ending balance: pooled	1,048,250			1,052,310
Loans measured at fair value	0			0
Total loans and leases held for investment	1,050,004		1,088,928	1,054,940
Real-Estate Commercial [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	20			250
Ending balance: pooled	45,259			41,718
Financing Receivable, Allowance for Credit Loss	45,279	44,757	41,673	41,968	41,678	41,095
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	4,863			7,527
Ending balance: pooled	3,270,277			2,928,677
Loans measured at fair value	0			0
Total loans and leases held for investment	3,275,140		3,027,955	2,936,204
Real-Estate Construction [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	5,732			3,847
Financing Receivable, Allowance for Credit Loss	5,732	5,433	4,952	3,847	4,223	4,575
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	427,561			329,915
Loans measured at fair value	0			0
Total loans and leases held for investment	427,561		381,811	329,915
Real Estate Residential Secured For Business Purpose [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	8,656			6,855
Financing Receivable, Allowance for Credit Loss	8,656	8,696	7,054	6,855	6,420	6,482
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	936			1,009
Ending balance: pooled	515,535			442,828
Loans measured at fair value	0			0
Total loans and leases held for investment	516,471		478,254	443,837
Real Estate Residential Secured For Personal Purpose [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	5,842			3,356
Financing Receivable, Allowance for Credit Loss	5,842	5,588	3,685	3,356	2,937	2,403
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	4,246			1,868
Ending balance: pooled	856,876			683,903
Loans measured at fair value	0			0
Total loans and leases held for investment	861,122		730,395	685,771
Real Estate Home Equity Secured For Personal Purpose [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	1,291			1,196
Financing Receivable, Allowance for Credit Loss	1,291	1,296	1,287	1,196	1,074	1,028
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	753			522
Ending balance: pooled	176,102			175,321
Loans measured at fair value	0			0
Total loans and leases held for investment	176,855		176,699	175,843
Loans to Individuals [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	387			372
Financing Receivable, Allowance for Credit Loss	387	560	351	372	376	363
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	27,331			26,679
Loans measured at fair value	0			0
Total loans and leases held for investment	27,331		27,873	26,679
Lease Financings [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	2,514			2,350
Financing Receivable, Allowance for Credit Loss	2,514	$ 2,508	3,082	2,350	$ 2,299	$ 2,290
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	240,474			196,070
Loans measured at fair value	0			0
Total loans and leases held for investment	$ 240,474		$ 211,315	$ 196,070