Loans and ACL - Summary of Amortized Cost of Loans Held for Investment by Internal Loan Grade by Year of Origination Quarterly (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 17,619		$ 196,370
2023	190,275		863,939
2022	852,109		357,834
2021	347,943		292,593
2020	287,459		105,787
Prior	422,527		334,975
Revolving Loans	275,432		278,619
Total	2,393,364		2,430,117
Current period gross charge-offs	2,702	$ 1,309
Current period gross charge-offs 2024	523
Current period gross charge-offs 2023	522
Current period gross charge-offs 2022	1,483
Current period gross charge-offs 2021	148
Current period gross charge-offs 2020	19
Current period gross charge-offs prior	7
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2,559		42,393
2023	42,185		189,770
2022	176,918		51,209
2021	48,204		32,563
2020	30,801		9,579
Prior	23,725		16,250
Revolving Loans	165,580		167,180
Total	489,972		508,944
Current period gross charge-offs	1,957	799
Current period gross charge-offs 2024	0
Current period gross charge-offs 2023	447
Current period gross charge-offs 2022	1,364
Current period gross charge-offs 2021	138
Current period gross charge-offs 2020	3
Current period gross charge-offs prior	5
Commercial and Industrial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			12,865
2023			96,805
2022			34,144
2021			14,983
2020			6,358
Prior			6,703
Revolving Loans			8,194
Total			180,052
Construction, commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	115
2023	10,616
2022	94,724
2021	19,083
2020	13,725
Prior	13,511
Revolving Loans	5,169
Total	156,943
Construction, Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5,952		33,464
2023	29,691		26,611
2022	9,580		3,867
2021	6,740		226
2020	191		941
Prior	64		67
Revolving Loans	10,729		10,656
Total	62,947		75,832
Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5,053		17,835
2023	18,649		305,554
2022	314,002		138,497
2021	145,617		169,033
2020	168,481		55,258
Prior	203,815		159,817
Revolving Loans	26,181		24,546
Total	881,798		870,540
Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	374		63,056
2023	65,403		229,954
2022	242,803		124,995
2021	123,714		72,921
2020	71,829		30,942
Prior	177,132		149,575
Revolving Loans	58,994		58,667
Total	740,249		730,110
Farmland [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			147
2023	144		729
2022	1,004		1,397
2021	1,383
2020			1,520
Prior	2,956		1,562
Revolving Loans	186		115
Total	5,673		5,470
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3,566		26,610
2023	23,587		14,516
2022	13,078		3,725
2021	3,202		2,867
2020	2,432		1,189
Prior	1,324		1,001
Revolving Loans	8,593		9,261
Total	55,782		59,169
Current period gross charge-offs	745	$ 510
Current period gross charge-offs 2024	523
Current period gross charge-offs 2023	75
Current period gross charge-offs 2022	119
Current period gross charge-offs 2021	10
Current period gross charge-offs 2020	16
Current period gross charge-offs prior	2
Risk Grades 1 - 4
Financing Receivable, Credit Quality Indicator [Line Items]
2024	17,322		148,222
2023	145,788		736,510
2022	716,428		317,608
2021	296,183		256,565
2020	254,915		88,076
Prior	358,664		278,644
Revolving Loans	234,781		237,830
Total	2,024,081		2,063,455
Risk Grades 1 - 4 \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2,491		15,830
2023	14,949		114,291
2022	109,129		32,273
2021	25,875		25,429
2020	23,954		8,217
Prior	20,635		14,200
Revolving Loans	136,887		138,267
Total	333,920		348,507
Risk Grades 1 - 4 \| Construction, commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	115		8,533
2023	9,397		85,687
2022	85,565		33,344
2021	17,534		14,690
2020	13,531		6,358
Prior	7,463		5,589
Revolving Loans	1,537		4,367
Total	135,142		158,568
Risk Grades 1 - 4 \| Construction, Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5,952		31,611
2023	27,017		22,734
2022	8,063		3,867
2021	6,740		59
2020	26		741
Prior	64		67
Revolving Loans	10,729		10,656
Total	58,591		69,735
Risk Grades 1 - 4 \| Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5,053		14,671
2023	18,197		280,479
2022	269,429		121,257
2021	122,861		144,498
2020	147,005		42,226
Prior	168,496		123,774
Revolving Loans	21,967		20,332
Total	753,011		747,237
Risk Grades 1 - 4 \| Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	145		51,042
2023	52,894		218,375
2022	230,577		121,872
2021	118,789		69,165
2020	68,096		27,877
Prior	157,871		132,986
Revolving Loans	55,377		55,327
Total	683,749		676,644
Risk Grades 1 - 4 \| Farmland [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023			729
2022	1,004		1,397
2021	1,383
2020			1,520
Prior	2,956		1,562
Revolving Loans	186		115
Total	5,529		5,323
Risk Grades 1 - 4 \| Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3,566		26,535
2023	23,334		14,215
2022	12,661		3,598
2021	3,001		2,724
2020	2,303		1,137
Prior	1,179		466
Revolving Loans	8,098		8,766
Total	54,142		57,441
Risk Grades 5 - 6
Financing Receivable, Credit Quality Indicator [Line Items]
2024	297		47,325
2023	43,704		88,599
2022	98,181		23,246
2021	34,596		28,318
2020	26,328		16,070
Prior	55,190		37,767
Revolving Loans	32,659		31,513
Total	290,955		272,838
Risk Grades 5 - 6 \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	68		26,563
2023	27,159		40,399
2022	37,715		12,759
2021	13,637		6,305
2020	6,044		819
Prior	2,338		1,537
Revolving Loans	20,977		19,722
Total	107,938		108,104
Risk Grades 5 - 6 \| Construction, commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			4,213
2023	1,101		11,072
2022	5,529		760
2021	1,513		293
2020	194
Prior	5,684		738
Revolving Loans	3,632		3,827
Total	17,653		20,903
Risk Grades 5 - 6 \| Construction, Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			1,486
2023	2,281		2,672
2022	1,362
2021			167
2020	165		200
Total	3,808		4,525
Risk Grades 5 - 6 \| Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			2,841
2023	452		25,075
2022	43,469		9,038
2021	15,779		19,597
2020	17,641		12,921
Prior	33,312		27,778
Revolving Loans	4,214		4,214
Total	114,867		101,464
Risk Grades 5 - 6 \| Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	229		12,014
2023	12,509		9,339
2022	10,066		677
2021	3,659		1,944
2020	2,278		2,122
Prior	13,796		7,281
Revolving Loans	3,341		3,255
Total	45,878		36,632
Risk Grades 5 - 6 \| Farmland [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			147
2023	144
Total	144		147
Risk Grades 5 - 6 \| Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			61
2023	58		42
2022	40		12
2021	8		12
2020	6		8
Prior	60		433
Revolving Loans	495		495
Total	667		1,063
Risk Grade 7
Financing Receivable, Credit Quality Indicator [Line Items]
2024			823
2023	783		4,627
2022	7,750		14,426
2021	14,607		7,710
2020	6,216		1,641
Prior	8,673		18,184
Revolving Loans	7,992		9,276
Total	46,021		56,687
Risk Grade 7 \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024
2023	77		877
2022	324		3,623
2021	6,135		829
2020	803		543
Prior	752		134
Revolving Loans	7,716		9,191
Total	15,807		15,197
Risk Grade 7 \| Construction, commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			119
2023	118		46
2022	3,630		40
2021	36
Prior	364		376
Total	4,148		581
Risk Grade 7 \| Construction, Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			367
2023	393		1,205
2022	155
Total	548		1,572
Risk Grade 7 \| Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			323
2022	1,104		8,202
2021	6,977		4,938
2020	3,835		111
Prior	2,007		8,265
Total	13,923		21,839
Risk Grade 7 \| Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023			2,240
2022	2,160		2,446
2021	1,266		1,812
2020	1,455		943
Prior	5,465		9,307
Revolving Loans	276		85
Total	10,622		16,833
Risk Grade 7 \| Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			14
2023	195		259
2022	377		115
2021	193		131
2020	123		44
Prior	85		102
Total	973		665
Risk Grade 8
Financing Receivable, Credit Quality Indicator [Line Items]
2023			34,203
2022	29,750		2,554
2021	2,557
Prior			380
Total	32,307		37,137
Risk Grade 8 \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023			34,203
2022	29,750		2,554
2021	2,557
Prior			379
Total	$ 32,307		37,136
Risk Grade 8 \| Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior			1
Total			$ 1

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