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Loans and ACL - Summary of Aging of amortized cost of loans held for investment by loan category (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Days past due	$ 2,179,508	$ 2,430,117
Nonaccrual	28,349	60,026
Gross loans	2,179,508	2,430,117
Deferred costs, net of loan fees	905	830
Total	2,180,413	2,430,947
Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	28,349	60,026
Nonaccrual loans with no allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	2,496	4,088
Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	25,853	55,938
30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total	9,071	14,282
60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total	1,930	1,913
Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Total	3,725	3,037
Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	2,137,338	2,351,689
Deferred costs, net of loan fees	905	830
Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Days past due	378,922	508,944
Nonaccrual	11,470	39,429
Gross loans	378,922	508,944
Commercial and Industrial [Member] | Nonaccrual loans with no allowance
Financing Receivable, Past Due [Line Items]
Nonaccrual	11,470	1,487
Commercial and Industrial [Member] | Non accrual loans with an allowance
Financing Receivable, Past Due [Line Items]
Nonaccrual		37,942
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	1,640	2,235
Gross loans	1,640	2,235
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	1,253	632
Gross loans	1,253	632
Commercial and Industrial [Member] | Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Days past due	3,142	1,709
Gross loans	3,142	1,709
Commercial and Industrial [Member] | Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	361,417	464,939
Construction, commercial [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	116,276	180,052
Nonaccrual	313	383
Gross loans	116,276	180,052
Construction, commercial [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	313	383
Construction, commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due		2,016
Gross loans		2,016
Construction, commercial [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	115,963	177,653
Construction, Residential [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	43,322	75,832
Gross loans	43,322	75,832
Construction, Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due		523
Gross loans		523
Construction, Residential [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	43,322	75,309
Commercial [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	873,721	870,540
Nonaccrual	7,329	11,880
Gross loans	873,721	870,540
Commercial [Member] | Nonaccrual loans with no allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual		2,024
Commercial [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	7,329	9,856
Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	4,252	2,109
Gross loans	4,252	2,109
Commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due		714
Gross loans		714
Commercial [Member] | Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due		574
Gross loans		574
Commercial [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	862,140	855,263
Residential [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	713,442	730,110
Nonaccrual	8,589	7,580
Gross loans	713,442	730,110
Residential [Member] | Nonaccrual loans with no allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	2,496	577
Residential [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	6,093	7,003
Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	1,237	5,101
Gross loans	1,237	5,101
Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	77	288
Gross loans	77	288
Residential [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	703,539	717,141
Farmland [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	5,619	5,470
Gross loans	5,619	5,470
Farmland [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	5,619	5,470
Consumer [Member]
Financing Receivable, Past Due [Line Items]
Days past due	48,206	59,169
Nonaccrual	648	754
Gross loans	48,206	59,169
Consumer [Member] | Non accrual loans with an allowance
Financing Receivable, Past Due [Line Items]
Nonaccrual	648	754
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due		2,298
Gross loans		2,298
Consumer [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	1,942
Gross loans	1,942
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	600	279
Gross loans	600	279
Consumer [Member] | Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Days past due	583	754
Gross loans	583	754
Consumer [Member] | Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	$ 44,433	$ 55,084

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