Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	$ 2,765	$ 11
Ending balance: pooled	76,239	71,913
Total: Allowance for Credit Loss	79,004	71,924	$ 83,044	$ 35,331
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	13,351	33,129
Ending balance: pooled	6,109,879	5,276,840
Loans measured at fair value	0	48
Total loans and leases held for investment	6,123,230	5,310,017
Commercial, Financial and Agricultural [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	2,765	0
Ending balance: pooled	14,151	13,536
Total: Allowance for Credit Loss	16,916	13,536	13,584	8,759
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	5,072	448
Ending balance: pooled	1,081,709	955,948
Loans measured at fair value	0	0
Total loans and leases held for investment	1,086,781	956,396
Paycheck Protection Program Loans [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	4	2
Total: Allowance for Credit Loss	4	2	0
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	2,147	31,748
Loans measured at fair value	0	0
Total loans and leases held for investment	2,147	31,748
Real Estate-Commercial [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	11
Ending balance: pooled	41,673	41,084
Total: Allowance for Credit Loss	41,673	41,095	52,230	15,750
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	4,537	27,900
Ending balance: pooled	3,023,418	2,690,587
Loans measured at fair value	0	48
Total loans and leases held for investment	3,027,955	2,718,535
Real Estate-Construction [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	4,952	4,575
Total: Allowance for Credit Loss	4,952	4,575	3,298	2,446
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	381,811	283,918
Loans measured at fair value	0	0
Total loans and leases held for investment	381,811	283,918
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	7,054	6,482
Total: Allowance for Credit Loss	7,054	6,482	7,317	2,622
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	1,013	2,187
Ending balance: pooled	477,241	407,713
Loans measured at fair value	0	0
Total loans and leases held for investment	478,254	409,900
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	3,685	2,403
Total: Allowance for Credit Loss	3,685	2,403	3,055	2,713
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	1,989	2,049
Ending balance: pooled	728,406	538,517
Loans measured at fair value	0	0
Total loans and leases held for investment	730,395	540,566
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	1,287	1,028
Total: Allowance for Credit Loss	1,287	1,028	1,176	1,076
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	740	545
Ending balance: pooled	175,959	158,364
Loans measured at fair value	0	0
Total loans and leases held for investment	176,699	158,909
Loans to Individuals [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	351	363
Total: Allowance for Credit Loss	351	363	533	470
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	27,873	25,504
Loans measured at fair value	0	0
Total loans and leases held for investment	27,873	25,504
Lease Financings [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	3,082	2,290
Total: Allowance for Credit Loss	3,082	2,290	1,701	1,311
Loans and Leases Held for Investment [Abstract]
Ending balance: individually analyzed	0	0
Ending balance: pooled	211,315	184,541
Loans measured at fair value	0	0
Total loans and leases held for investment	211,315	184,541
Unallocated [Member]
Allowance For Credit Losses, Loans And Leases [Abstract]
Ending balance: pooled	0	150
Total: Allowance for Credit Loss	$ 0	$ 150	$ 150	$ 184

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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- Definition

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
-Topic 326
-SubTopic 20
-Section 45
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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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-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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Allowance for loan and lease losses.

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