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Loans and ACL - Summary of Aging of loans held for investment by loan category (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Days past due	$ 2,059,281	$ 2,110,755
Nonaccrual	22,273	22,957
Deferred costs, net of loan fees	429	1,042
Total	2,059,710	2,111,797
Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	22,273	22,957
Nonaccrual loans with no allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,052	2,447
Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	21,221	20,510
30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total	17,248	7,130
60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total	1,704	2,041
Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Total	2,608	2,486
Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	2,015,877	2,077,183
Deferred costs, net of loan fees	429	1,042
Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Days past due	340,099	354,904
Nonaccrual	9,751	10,185
Commercial and Industrial [Member] | Nonaccrual loans with no allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual		778
Commercial and Industrial [Member] | Non accrual loans with an allowance
Financing Receivable, Past Due [Line Items]
Nonaccrual	9,751	9,407
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	1,456	1,335
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	874	1,232
Commercial and Industrial [Member] | Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Days past due	2,316	2,259
Commercial and Industrial [Member] | Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	325,702	339,893
Construction, Commercial [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	103,006	114,491
Nonaccrual	218	220
Construction, Commercial [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	218	220
Construction, Commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due		33
Construction, Commercial [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	102,788	114,238
Construction, Residential [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	53,498	51,807
Construction, Residential [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	53,498	51,807
Commercial [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	834,223	847,842
Nonaccrual	4,174	4,235
Commercial [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	4,174	4,235
Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	3,651	625
Commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	119
Commercial [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	826,279	842,982
Residential [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	683,946	692,253
Nonaccrual	7,420	7,497
Residential [Member] | Nonaccrual loans with no allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,052	1,669
Residential [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	6,368	5,828
Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	11,252	3,874
Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	519	476
Residential [Member] | Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	70
Residential [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	664,685	680,406
Farmland [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	4,748	5,520
Farmland [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	4,748	5,520
Consumer [Member]
Financing Receivable, Past Due [Line Items]
Days past due	39,761	43,938
Nonaccrual	710	820
Consumer [Member] | Non accrual loans with an allowance
Financing Receivable, Past Due [Line Items]
Nonaccrual	710	820
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	889	1,296
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	192	300
Consumer [Member] | Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Days past due	222	227
Consumer [Member] | Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	$ 37,748	$ 41,295

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