Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	$ 11	$ 585
Ending balance: pooled	71,913	82,459
Total: Allowance for Credit Loss	71,924	83,044	$ 35,331	$ 29,364
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	33,129	31,485
Ending balance: pooled	5,276,840	5,275,169
Loans measured at fair value	48	187
Total loans and leases held for investment	5,310,017	5,306,841
Commercial, Financial and Agricultural [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	535
Ending balance: pooled	13,536	13,049
Total: Allowance for Credit Loss	13,536	13,584	8,759	7,983
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	448	2,827
Ending balance: pooled	955,948	889,838
Loans measured at fair value	0	0
Total loans and leases held for investment	956,396	892,665
Paycheck Protection Program Loans [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	2	0
Total: Allowance for Credit Loss	2	0
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	31,748	483,773
Loans measured at fair value	0	0
Total loans and leases held for investment	31,748	483,773
Real Estate-Commercial [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	11	0
Ending balance: pooled	41,084	52,230
Total: Allowance for Credit Loss	41,095	52,230	15,750
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	27,900	22,739
Ending balance: pooled	2,690,587	2,435,946
Loans measured at fair value	48	187
Total loans and leases held for investment	2,718,535	2,458,872
Real Estate-Construction [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	4,575	3,298
Total: Allowance for Credit Loss	4,575	3,298	2,446
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	283,918	243,355
Loans measured at fair value	0	0
Total loans and leases held for investment	283,918	243,355
Real Estate-Residential Secured for Business Purpose [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	24
Ending balance: pooled	6,482	7,293
Total: Allowance for Credit Loss	6,482	7,317	2,622	2,236
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	2,187	2,786
Ending balance: pooled	407,713	378,660
Loans measured at fair value	0	0
Total loans and leases held for investment	409,900	381,446
Real Estate-Residential Secured for Personal Purpose [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	26
Ending balance: pooled	2,403	3,029
Total: Allowance for Credit Loss	2,403	3,055	2,713
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	2,049	2,086
Ending balance: pooled	538,517	485,514
Loans measured at fair value	0	0
Total loans and leases held for investment	540,566	487,600
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	1,028	1,176
Total: Allowance for Credit Loss	1,028	1,176	1,076
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	545	1,047
Ending balance: pooled	158,364	165,562
Loans measured at fair value	0	0
Total loans and leases held for investment	158,909	166,609
Loans to Individuals [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	363	533
Total: Allowance for Credit Loss	363	533	470	484
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	25,504	27,482
Loans measured at fair value	0	0
Total loans and leases held for investment	25,504	27,482
Lease Financings [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	2,290	1,701
Total: Allowance for Credit Loss	2,290	1,701	1,311	1,288
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	184,541	165,039
Loans measured at fair value	0	0
Total loans and leases held for investment	184,541	165,039
Unallocated [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: pooled	150	150
Total: Allowance for Credit Loss	$ 150	$ 150	$ 184	$ 271

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.

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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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- 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.

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Allowance for loan and lease losses.

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