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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
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 $ 44,040 $ 196,370
2023 168,275 863,939
2022 787,642 357,834
2021 334,096 292,593
2020 270,625 105,787
Prior 364,466 334,975
Revolving Loans 210,364 278,619
Total 2,179,508 2,430,117
Current period gross charge-offs 23,225  
Current period gross charge-offs 2024 682  
Current period gross charge-offs 2023 799  
Current period gross charge-offs 2022 18,323  
Current period gross charge-offs 2021 2,501  
Current period gross charge-offs 2020 156  
Current period gross charge-offs prior 315  
Current period gross charge-offs revolving 449  
Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 10,669 42,393
2023 36,271 189,770
2022 127,343 51,209
2021 41,064 32,563
2020 26,136 9,579
Prior 19,357 16,250
Revolving Loans 118,082 167,180
Total 378,922 508,944
Current period gross charge-offs 19,940  
Current period gross charge-offs 2024 73  
Current period gross charge-offs 2023 475  
Current period gross charge-offs 2022 16,213  
Current period gross charge-offs 2021 2,437  
Current period gross charge-offs 2020 130  
Current period gross charge-offs prior 165  
Current period gross charge-offs revolving 447  
Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 6,071 12,865
2023 8,215 96,805
2022 65,296 34,144
2021 16,226 14,983
2020 10,480 6,358
Prior 9,589 6,703
Revolving Loans 399 8,194
Total 116,276 180,052
Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 12,746 33,464
2023 11,876 26,611
2022 6,723 3,867
2021 11,917 226
2020 0 941
Prior 60 67
Revolving Loans 0 10,656
Total 43,322 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 6,904 17,835
2023 22,723 305,554
2022 339,940 138,497
2021 140,992 169,033
2020 163,912 55,258
Prior 173,920 159,817
Revolving Loans 25,330 24,546
Total 873,721 870,540
Current period gross charge-offs 1,109  
Current period gross charge-offs 2022 1,103  
Current period gross charge-offs prior 6  
Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 1,240 63,056
2023 69,602 229,954
2022 237,037 124,995
2021 120,242 72,921
2020 68,529 30,942
Prior 158,031 149,575
Revolving Loans 58,761 58,667
Total 713,442 730,110
Current period gross charge-offs 74  
Current period gross charge-offs prior 72  
Current period gross charge-offs revolving 2  
Farmland [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 148 147
2023 138 729
2022 1,000 1,397
2021 1,353  
2020 0 1,520
Prior 2,816 1,562
Revolving Loans 164 115
Total 5,619 5,470
Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 6,262 26,610
2023 19,450 14,516
2022 10,303 3,725
2021 2,302 2,867
2020 1,568 1,189
Prior 693 1,001
Revolving Loans 7,628 9,261
Total 48,206 59,169
Current period gross charge-offs 2,063  
Current period gross charge-offs 2024 609  
Current period gross charge-offs 2023 324  
Current period gross charge-offs 2022 1,007  
Current period gross charge-offs 2021 64  
Current period gross charge-offs 2020 26  
Current period gross charge-offs prior 33  
Risk Grades 1 - 4    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 39,712 148,222
2023 126,584 736,510
2022 662,175 317,608
2021 282,202 256,565
2020 240,750 88,076
Prior 312,556 278,644
Revolving Loans 186,036 237,830
Total 1,850,015 2,063,455
Risk Grades 1 - 4 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 9,046 15,830
2023 9,673 114,291
2022 84,473 32,273
2021 16,702 25,429
2020 19,368 8,217
Prior 17,087 14,200
Revolving Loans 102,357 138,267
Total 258,706 348,507
Risk Grades 1 - 4 | Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 6,071 8,533
2023 7,005 85,687
2022 63,471 33,344
2021 15,166 14,690
2020 10,480 6,358
Prior 5,615 5,589
Revolving Loans 399 4,367
Total 108,207 158,568
Risk Grades 1 - 4 | Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 12,491 31,611
2023 11,772 22,734
2022 3,563 3,867
2021 11,917 59
2020   741
Prior 60 67
Revolving Loans   10,656
Total 39,803 69,735
Risk Grades 1 - 4 | Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 4,799 14,671
2023 22,723 280,479
2022 274,021 121,257
2021 120,168 144,498
2020 144,931 42,226
Prior 142,903 123,774
Revolving Loans 20,621 20,332
Total 730,166 747,237
Risk Grades 1 - 4 | Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 940 51,042
2023 56,212 218,375
2022 225,724 121,872
2021 114,846 69,165
2020 64,510 27,877
Prior 143,476 132,986
Revolving Loans 55,317 55,327
Total 661,025 676,644
Risk Grades 1 - 4 | Farmland [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 148  
2023   729
2022 1,000 1,397
2021 1,252  
2020   1,520
Prior 2,816 1,562
Revolving Loans 164 115
Total 5,380 5,323
Risk Grades 1 - 4 | Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 6,217 26,535
2023 19,199 14,215
2022 9,923 3,598
2021 2,151 2,724
2020 1,461 1,137
Prior 599 466
Revolving Loans 7,178 8,766
Total 46,728 57,441
Risk Grades 5 - 6    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 1,842 47,325
2023 39,516 88,599
2022 116,397 23,246
2021 22,820 28,318
2020 23,186 16,070
Prior 38,067 37,767
Revolving Loans 19,882 31,513
Total 261,710 272,838
Risk Grades 5 - 6 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 752 26,563
2023 25,585 40,399
2022 38,620 12,759
2021 11,558 6,305
2020 5,621 819
Prior 893 1,537
Revolving Loans 13,974 19,722
Total 97,003 108,104
Risk Grades 5 - 6 | Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   4,213
2023 1,094 11,072
2022 102 760
2021 1,034 293
Prior 3,620 738
Revolving Loans   3,827
Total 5,850 20,903
Risk Grades 5 - 6 | Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 255 1,486
2023   2,672
2022 3,005  
2021   167
2020   200
Total 3,260 4,525
Risk Grades 5 - 6 | Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 535 2,841
2023   25,075
2022 65,919 9,038
2021 7,042 19,597
2020 15,291 12,921
Prior 24,264 27,778
Revolving Loans 4,184 4,214
Total 117,235 101,464
Risk Grades 5 - 6 | Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 300 12,014
2023 12,649 9,339
2022 8,715 677
2021 3,075 1,944
2020 2,250 2,122
Prior 9,237 7,281
Revolving Loans 1,274 3,255
Total 37,500 36,632
Risk Grades 5 - 6 | Farmland [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   147
2023 138  
2021 101  
Total 239 147
Risk Grades 5 - 6 | Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   61
2023 50 42
2022 36 12
2021 10 12
2020 24 8
Prior 53 433
Revolving Loans 450 495
Total 623 1,063
Risk Grade 7    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 2,486 823
2023 2,175 4,627
2022 9,070 14,426
2021 25,406 7,710
2020 5,962 1,641
Prior 13,842 18,184
Revolving Loans 4,396 9,276
Total 63,337 56,687
Risk Grade 7 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 871  
2023 1,013 877
2022 4,250 3,623
2021 10,515 829
2020 420 543
Prior 1,376 134
Revolving Loans 1,701 9,191
Total 20,146 15,197
Risk Grade 7 | Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   119
2023 116 46
2022 1,723 40
2021 26  
Prior 354 376
Total 2,219 581
Risk Grade 7 | Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024   367
2023 104 1,205
2022 155  
Total 259 1,572
Risk Grade 7 | Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 1,570 323
2022   8,202
2021 12,403 4,938
2020 3,690 111
Prior 6,753 8,265
Revolving Loans 525  
Total 24,941 21,839
Risk Grade 7 | Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 741 2,240
2022 2,598 2,446
2021 2,321 1,812
2020 1,769 943
Prior 5,318 9,307
Revolving Loans 2,170 85
Total 14,917 16,833
Risk Grade 7 | Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 45 14
2023 201 259
2022 344 115
2021 141 131
2020 83 44
Prior 41 102
Total 855 665
Risk Grade 8    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 0  
2023   34,203
2022   2,554
2021 3,668  
2020 727  
Prior 1 380
Revolving Loans 50  
Total 4,446 37,137
Risk Grade 8 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 0  
2023   34,203
2022   2,554
2021 2,289  
2020 727  
Prior 1 379
Revolving Loans 50  
Total 3,067 37,136
Risk Grade 8 | Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,379  
Total $ 1,379  
Risk Grade 8 | Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior   1
Total   $ 1