Loans and ACL - Summary of Aging of amortized cost of loans held for investment by loan category (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Days past due	$ 2,458,604
Nonaccrual	83,715	$ 10,324
Total Past Due & Nonaccrual		35,552
Gross loans	2,458,604	2,412,699
Less: deferred loan fees, net of costs	327	(1,640)
Total	2,458,931	2,411,059
Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	83,715
Nonaccrual loans with no allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	11,009
Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	72,706
30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total	6,931	14,663
60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total	2,646	2,305
Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Total	2,403	8,260
PCI Loans [Member]
Financing Receivable, Past Due [Line Items]
PCI Loans		58,748
Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current		2,316,759
Less: deferred loan fees, net of costs	327	(1,640)
Total	2,363,236
Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Days past due	545,921
Nonaccrual	61,848	2,314
Total Past Due & Nonaccrual		3,081
Gross loans	545,921	590,049
Commercial and Industrial [Member] | Nonaccrual loans with no allowance
Financing Receivable, Past Due [Line Items]
Nonaccrual	27
Commercial and Industrial [Member] | Non accrual loans with an allowance
Financing Receivable, Past Due [Line Items]
Nonaccrual	61,821
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	1,654	488
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due		279
Commercial and Industrial [Member] | PCI Loans [Member]
Financing Receivable, Past Due [Line Items]
PCI Loans		1,481
Commercial and Industrial [Member] | Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	482,419	585,487
Paycheck Protection Program [Member]
Financing Receivable, Past Due [Line Items]
Days past due	7,234
Gross loans	7,234	11,967
Paycheck Protection Program [Member] | Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	7,234	11,967
Construction, commercial [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	165,863
Nonaccrual	1,045	714
Total Past Due & Nonaccrual		1,869
Gross loans	165,863	183,301
Construction, commercial [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,045
Construction, commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	2,329	1,136
Construction, commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	313	19
Construction, commercial [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	162,176	181,432
Construction, Residential [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	82,199
Nonaccrual	654
Total Past Due & Nonaccrual		2,620
Gross loans	82,199	76,599
Construction, Residential [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	654
Construction, Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	727	1,416
Construction, Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due		1,204
Construction, Residential [Member] | PCI Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
PCI Loans		7
Construction, Residential [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	80,818	73,972
Mortgage, Commercial [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	879,729
Nonaccrual	11,195	1,658
Total Past Due & Nonaccrual		14,388
Gross loans	879,729	864,989
Mortgage, Commercial [Member] | Nonaccrual loans with no allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	10,102
Mortgage, Commercial [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,093
Mortgage, Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	462	6,199
Mortgage, Commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	1,104	297
Mortgage, Commercial [Member] | Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due		6,234
Mortgage, Commercial [Member] | PCI Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
PCI Loans		51,223
Mortgage, Commercial [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	866,968	799,378
Mortgage, Residential [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	709,565
Nonaccrual	8,426	5,143
Total Past Due & Nonaccrual		11,916
Gross loans	709,565	631,772
Mortgage, Residential [Member] | Nonaccrual loans with no allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	879
Mortgage, Residential [Member] | Non accrual loans with an allowance | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	7,547
Mortgage, Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	389	4,544
Mortgage, Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	571	231
Mortgage, Residential [Member] | Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	1,998	1,998
Mortgage, Residential [Member] | PCI Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
PCI Loans		5,678
Mortgage, Residential [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	698,181	614,178
Mortgage, Farmland [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due	5,583
Total Past Due & Nonaccrual		75
Gross loans	5,583	6,599
Mortgage, Farmland [Member] | 60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Days past due		75
Mortgage, Farmland [Member] | Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	5,583	6,524
Consumer [Member]
Financing Receivable, Past Due [Line Items]
Days past due	62,510
Nonaccrual	547	495
Total Past Due & Nonaccrual		1,603
Gross loans	62,510	47,423
Consumer [Member] | Nonaccrual loans with no allowance
Financing Receivable, Past Due [Line Items]
Nonaccrual	1
Consumer [Member] | Non accrual loans with an allowance
Financing Receivable, Past Due [Line Items]
Nonaccrual	546
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	1,370	880
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Days past due	658	200
Consumer [Member] | Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Days past due	405	28
Consumer [Member] | PCI Loans [Member]
Financing Receivable, Past Due [Line Items]
PCI Loans		359
Consumer [Member] | Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investments Current	$ 59,530	$ 45,461