Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	$ 912		$ 954
Ending balance: pooled	79,122		67,332
Financing Receivable, Allowance for Credit Loss	80,034	$ 79,004	68,286	$ 71,924
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	11,301		30,727
Ending balance: pooled	6,228,503		5,370,046
Loans measured at fair value	0		13
Total loans and leases held for investment	6,239,804	6,123,230	5,400,786
Commercial Financial And Agricultural [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	912		0
Ending balance: pooled	13,813		11,841
Financing Receivable, Allowance for Credit Loss	14,725	16,920	11,841	13,538
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	3,423		448
Ending balance: pooled	1,029,330		942,335
Loans measured at fair value	0		0
Total loans and leases held for investment	1,032,753	1,088,928	942,783
Real-Estate Commercial [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		954
Ending balance: pooled	43,150		39,472
Financing Receivable, Allowance for Credit Loss	43,150	41,673	40,426	41,095
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	4,288		26,411
Ending balance: pooled	3,123,922		2,790,313
Loans measured at fair value	0		13
Total loans and leases held for investment	3,128,210	3,027,955	2,816,737
Real-Estate Construction [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	4,681		3,634
Financing Receivable, Allowance for Credit Loss	4,681	4,952	3,634	4,575
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	383		0
Ending balance: pooled	376,186		285,083
Loans measured at fair value	0		0
Total loans and leases held for investment	376,569	381,811	285,083
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	8,360		6,202
Financing Receivable, Allowance for Credit Loss	8,360	7,054	6,202	6,482
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	759		1,120
Ending balance: pooled	497,746		411,366
Loans measured at fair value	0		0
Total loans and leases held for investment	498,505	478,254	412,486
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	5,012		2,592
Financing Receivable, Allowance for Credit Loss	5,012	3,685	2,592	2,403
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,500		2,259
Ending balance: pooled	778,057		566,476
Loans measured at fair value	0		0
Total loans and leases held for investment	779,557	730,395	568,735
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	1,271		976
Financing Receivable, Allowance for Credit Loss	1,271	1,287	976	1,028
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	948		489
Ending balance: pooled	171,125		159,645
Loans measured at fair value	0		0
Total loans and leases held for investment	172,073	176,699	160,134
Loans to Individuals [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	375		369
Financing Receivable, Allowance for Credit Loss	375	351	369	363
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	28,656		26,249
Loans measured at fair value	0		0
Total loans and leases held for investment	28,656	27,873	26,249
Lease Financings [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	2,460		2,246
Financing Receivable, Allowance for Credit Loss	2,460	3,082	2,246	$ 2,290
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	223,481		188,579
Loans measured at fair value	0		0
Total loans and leases held for investment	$ 223,481	$ 211,315	$ 188,579

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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-Publisher FASB
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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
-SubTopic 10
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Reserve for loan and lease losses.

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