Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	$ 373			$ 1,089
Ending balance: pooled	82,336			70,922
Financing Receivable, Allowance for Credit Loss	82,709	$ 80,034	$ 79,004	72,011	$ 68,286	$ 71,924
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	14,894			13,142
Ending balance: pooled	6,447,344			5,648,635
Loans measured at fair value	0			0
Total loans and leases held for investment	6,462,238		6,123,230	5,661,777
Commercial Financial And Agricultural [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	373			0
Ending balance: pooled	13,498			13,004
Financing Receivable, Allowance for Credit Loss	13,871	14,725	16,920	13,004	11,841	13,538
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,217			448
Ending balance: pooled	1,038,048			1,033,264
Loans measured at fair value	0			0
Total loans and leases held for investment	1,039,265		1,088,928	1,033,712
Real-Estate Commercial [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			1,089
Ending balance: pooled	44,757			40,589
Financing Receivable, Allowance for Credit Loss	44,757	43,150	41,673	41,678	40,426	41,095
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	4,405			9,137
Ending balance: pooled	3,217,588			2,861,149
Loans measured at fair value	0			0
Total loans and leases held for investment	3,221,993		3,027,955	2,870,286
Real-Estate Construction [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	5,433			4,223
Financing Receivable, Allowance for Credit Loss	5,433	4,681	4,952	4,223	3,634	4,575
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	6,202			0
Ending balance: pooled	407,202			319,449
Loans measured at fair value	0			0
Total loans and leases held for investment	413,404		381,811	319,449
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	8,696			6,420
Financing Receivable, Allowance for Credit Loss	8,696	8,360	7,054	6,420	6,202	6,482
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,032			961
Ending balance: pooled	516,489			418,691
Loans measured at fair value	0			0
Total loans and leases held for investment	517,521		478,254	419,652
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	5,588			2,937
Financing Receivable, Allowance for Credit Loss	5,588	5,012	3,685	2,937	2,592	2,403
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,154			2,202
Ending balance: pooled	831,478			626,942
Loans measured at fair value	0			0
Total loans and leases held for investment	832,632		730,395	629,144
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	1,296			1,074
Financing Receivable, Allowance for Credit Loss	1,296	1,271	1,287	1,074	976	1,028
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	884			394
Ending balance: pooled	174,206			168,142
Loans measured at fair value	0			0
Total loans and leases held for investment	175,090		176,699	168,536
Loans to Individuals [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	560			376
Financing Receivable, Allowance for Credit Loss	560	375	351	376	369	363
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	25,544			27,061
Loans measured at fair value	0			0
Total loans and leases held for investment	25,544		27,873	27,061
Lease Financings [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	2,508			2,299
Financing Receivable, Allowance for Credit Loss	2,508	$ 2,460	3,082	2,299	$ 2,246	$ 2,290
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0			0
Ending balance: pooled	236,789			193,937
Loans measured at fair value	0			0
Total loans and leases held for investment	$ 236,789		$ 211,315	$ 193,937