Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	$ 954		$ 281
Ending balance: pooled	67,332		71,216
Financing Receivable, Allowance for Credit Loss	68,286	$ 71,924	71,497	$ 83,044
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	30,727		29,847
Ending balance: pooled	5,370,046		5,385,007
Loans measured at fair value	13		152
Total loans and leases held for investment	5,400,786	5,310,017	5,415,006
Commercial Financial And Agricultural [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		253
Ending balance: pooled	11,840		9,980
Financing Receivable, Allowance for Credit Loss	11,840	13,536	10,233	13,584
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	448		2,006
Ending balance: pooled	932,037		869,990
Loans measured at fair value	0		0
Total loans and leases held for investment	932,485	956,396	871,996
Paycheck Protection Program Loans
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	1		0
Financing Receivable, Allowance for Credit Loss	1	2	0
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	10,298		528,452
Loans measured at fair value	0		0
Total loans and leases held for investment	10,298	31,748	528,452
Real-Estate Commercial [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	954		0
Ending balance: pooled	39,472		45,459
Financing Receivable, Allowance for Credit Loss	40,426	41,095	45,459	52,230
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	26,411		22,026
Ending balance: pooled	2,790,313		2,509,522
Loans measured at fair value	13		152
Total loans and leases held for investment	2,816,737	2,718,535	2,531,700
Real-Estate Construction [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	3,634		2,799
Financing Receivable, Allowance for Credit Loss	3,634	4,575	2,799	3,298
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	285,083		249,652
Loans measured at fair value	0		0
Total loans and leases held for investment	285,083	283,918	249,652
Real Estate Residential Secured For Business Purpose [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		3
Ending balance: pooled	6,202		6,689
Financing Receivable, Allowance for Credit Loss	6,202	6,482	6,692	7,317
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	1,120		2,859
Ending balance: pooled	411,366		384,942
Loans measured at fair value	0		0
Total loans and leases held for investment	412,486	409,900	387,801
Real Estate Residential Secured For Personal Purpose [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		25
Ending balance: pooled	2,592		3,031
Financing Receivable, Allowance for Credit Loss	2,592	2,403	3,056	3,055
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	2,259		1,867
Ending balance: pooled	566,476		492,482
Loans measured at fair value	0		0
Total loans and leases held for investment	568,735	540,566	494,349
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	976		1,257
Financing Receivable, Allowance for Credit Loss	976	1,028	1,257	1,176
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	489		1,089
Ending balance: pooled	159,645		161,440
Loans measured at fair value	0		0
Total loans and leases held for investment	160,134	158,909	162,529
Loans to Individuals [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	369		447
Financing Receivable, Allowance for Credit Loss	369	363	447	533
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	26,249		25,468
Loans measured at fair value	0		0
Total loans and leases held for investment	26,249	25,504	25,468
Lease Financings [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	2,246		1,404
Financing Receivable, Allowance for Credit Loss	2,246	2,290	1,404	1,701
Loans and leases held for investment [Abstract]
Ending balance: individually analyzed	0		0
Ending balance: pooled	188,579		163,059
Loans measured at fair value	0		0
Total loans and leases held for investment	188,579	184,541	163,059
Unallocated [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: pooled	0		150
Financing Receivable, Allowance for Credit Loss	$ 0	$ 150	$ 150	$ 150

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 of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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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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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.

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Reserve for loan and lease losses.

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