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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
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 $ 31,050 $ 196,370
2023 181,236 863,939
2022 806,745 357,834
2021 338,940 292,593
2020 276,967 105,787
Prior 388,570 334,975
Revolving Loans 234,935 278,619
Total 2,258,443 2,430,117
Current period gross charge-offs 15,312  
Current period gross charge-offs 2024 434  
Current period gross charge-offs 2023 225  
Current period gross charge-offs 2022 13,964  
Current period gross charge-offs 2021 329  
Current period gross charge-offs 2020 144  
Current period gross charge-offs prior 213  
Current period gross charge-offs revolving 3  
Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 8,467 42,393
2023 41,393 189,770
2022 130,955 51,209
2021 43,364 32,563
2020 27,873 9,579
Prior 22,766 16,250
Revolving Loans 126,771 167,180
Total 401,589 508,944
Current period gross charge-offs 13,939  
Current period gross charge-offs 2023 47  
Current period gross charge-offs 2022 13,345  
Current period gross charge-offs 2021 302  
Current period gross charge-offs 2020 124  
Current period gross charge-offs prior 120  
Current period gross charge-offs revolving 1  
Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 0 12,865
2023 9,980 96,805
2022 83,842 34,144
2021 17,720 14,983
2020 10,604 6,358
Prior 11,119 6,703
Revolving Loans 2,252 8,194
Total 135,517 180,052
Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 7,906 33,464
2023 18,034 26,611
2022 7,737 3,867
2021 9,758 226
2020 163 941
Prior 62 67
Revolving Loans 12,189 10,656
Total 55,849 75,832
Current period gross charge-offs 39  
Current period gross charge-offs prior 39  
Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 7,409 17,835
2023 21,379 305,554
2022 332,098 138,497
2021 142,044 169,033
2020 165,348 55,258
Prior 186,253 159,817
Revolving Loans 24,567 24,546
Total 879,098 870,540
Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 934 63,056
2023 68,642 229,954
2022 239,349 124,995
2021 121,928 72,921
2020 70,915 30,942
Prior 164,514 149,575
Revolving Loans 60,964 58,667
Total 727,246 730,110
Current period gross charge-offs 44  
Current period gross charge-offs prior 42  
Current period gross charge-offs revolving 2  
Farmland [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 150 147
2023 141 729
2022 1,002 1,397
2021 1,369  
2020 0 1,520
Prior 2,888 1,562
Revolving Loans 167 115
Total 5,717 5,470
Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 6,184 26,610
2023 21,667 14,516
2022 11,762 3,725
2021 2,757 2,867
2020 2,064 1,189
Prior 968 1,001
Revolving Loans 8,025 9,261
Total 53,427 59,169
Current period gross charge-offs 1,290  
Current period gross charge-offs 2024 434  
Current period gross charge-offs 2023 178  
Current period gross charge-offs 2022 619  
Current period gross charge-offs 2021 27  
Current period gross charge-offs 2020 20  
Current period gross charge-offs prior 12  
Risk Grades 1 - 4    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 26,357 148,222
2023 138,984 736,510
2022 659,037 317,608
2021 283,495 256,565
2020 246,652 88,076
Prior 338,992 278,644
Revolving Loans 201,740 237,830
Total 1,895,257 2,063,455
Risk Grades 1 - 4 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 7,340 15,830
2023 14,180 114,291
2022 87,369 32,273
2021 18,050 25,429
2020 21,300 8,217
Prior 19,557 14,200
Revolving Loans 101,747 138,267
Total 269,543 348,507
Risk Grades 1 - 4 | Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   8,533
2023 8,765 85,687
2022 58,330 33,344
2021 16,190 14,690
2020 10,604 6,358
Prior 5,791 5,589
Revolving Loans 2,252 4,367
Total 101,932 158,568
Risk Grades 1 - 4 | Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 7,508 31,611
2023 17,128 22,734
2022 4,974 3,867
2021 9,758 59
2020   741
Prior 62 67
Revolving Loans 12,189 10,656
Total 51,619 69,735
Risk Grades 1 - 4 | Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 4,255 14,671
2023 21,379 280,479
2022 268,057 121,257
2021 119,175 144,498
2020 145,317 42,226
Prior 159,935 123,774
Revolving Loans 20,358 20,332
Total 738,476 747,237
Risk Grades 1 - 4 | Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 934 51,042
2023 56,064 218,375
2022 227,986 121,872
2021 116,478 69,165
2020 67,486 27,877
Prior 149,912 132,986
Revolving Loans 57,409 55,327
Total 676,269 676,644
Risk Grades 1 - 4 | Farmland [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 150  
2023   729
2022 1,002 1,397
2021 1,266  
2020   1,520
Prior 2,888 1,562
Revolving Loans 167 115
Total 5,473 5,323
Risk Grades 1 - 4 | Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 6,170 26,535
2023 21,468 14,215
2022 11,319 3,598
2021 2,578 2,724
2020 1,945 1,137
Prior 847 466
Revolving Loans 7,618 8,766
Total 51,945 57,441
Risk Grades 5 - 6    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 4,465 47,325
2023 38,311 88,599
2022 141,210 23,246
2021 35,934 28,318
2020 24,501 16,070
Prior 35,032 37,767
Revolving Loans 31,005 31,513
Total 310,458 272,838
Risk Grades 5 - 6 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 913 26,563
2023 23,961 40,399
2022 42,271 12,759
2021 16,008 6,305
2020 5,790 819
Prior 1,831 1,537
Revolving Loans 23,233 19,722
Total 114,007 108,104
Risk Grades 5 - 6 | Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   4,213
2023 1,098 11,072
2022 23,789 760
2021 1,498 293
Prior 4,968 738
Revolving Loans   3,827
Total 31,353 20,903
Risk Grades 5 - 6 | Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 398 1,486
2023 479 2,672
2022 2,608  
2021   167
2020 163 200
Total 3,648 4,525
Risk Grades 5 - 6 | Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 3,154 2,841
2023   25,075
2022 62,937 9,038
2021 13,818 19,597
2020 16,259 12,921
Prior 19,209 27,778
Revolving Loans 4,184 4,214
Total 119,561 101,464
Risk Grades 5 - 6 | Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   12,014
2023 12,578 9,339
2022 9,567 677
2021 4,496 1,944
2020 2,263 2,122
Prior 8,967 7,281
Revolving Loans 3,181 3,255
Total 41,052 36,632
Risk Grades 5 - 6 | Farmland [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   147
2023 141  
2021 103  
Total 244 147
Risk Grades 5 - 6 | Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   61
2023 54 42
2022 38 12
2021 11 12
2020 26 8
Prior 57 433
Revolving Loans 407 495
Total 593 1,063
Risk Grade 7    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 14 823
2023 3,941 4,627
2022 5,394 14,426
2021 16,969 7,710
2020 5,814 1,641
Prior 14,545 18,184
Revolving Loans 2,190 9,276
Total 48,867 56,687
Risk Grade 7 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 3,252 877
2022 1,315 3,623
2021 6,764 829
2020 783 543
Prior 1,377 134
Revolving Loans 1,791 9,191
Total 15,282 15,197
Risk Grade 7 | Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   119
2023 117 46
2022 1,723 40
2021 32  
Prior 360 376
Total 2,232 581
Risk Grade 7 | Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   367
2023 427 1,205
2022 155  
Total 582 1,572
Risk Grade 7 | Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   323
2022   8,202
2021 9,051 4,938
2020 3,772 111
Prior 7,109 8,265
Revolving Loans 25  
Total 19,957 21,839
Risk Grade 7 | Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023   2,240
2022 1,796 2,446
2021 954 1,812
2020 1,166 943
Prior 5,635 9,307
Revolving Loans 374 85
Total 9,925 16,833
Risk Grade 7 | Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 14 14
2023 145 259
2022 405 115
2021 168 131
2020 93 44
Prior 64 102
Total 889 665
Risk Grade 8    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 214  
2023   34,203
2022 1,104 2,554
2021 2,542  
Prior 1 380
Total 3,861 37,137
Risk Grade 8 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 214  
2023   34,203
2022   2,554
2021 2,542  
Prior 1 379
Total 2,757 37,136
Risk Grade 8 | Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 1,104  
Total $ 1,104  
Risk Grade 8 | Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior   1
Total   $ 1