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Loans Held for Investment and Allowance for Credit Losses on Loans - Gross Loans Held for Investment by Year of Origination and Internally Assigned Credit Grades (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | $ 1,856,792 |
Fiscal year before current fiscal year | 1,545,836 |
Two years before current fiscal year | 814,101 |
Three years before current fiscal year | 568,089 |
Four years before current fiscal year | 275,358 |
Prior | 637,065 |
Revolving Loans Amortized Cost Basis | 1,130,531 |
Total Loans | 6,827,772 | $ 6,169,442
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 172,545 |
Fiscal year before current fiscal year | 182,383 |
Two years before current fiscal year | 143,444 |
Three years before current fiscal year | 114,850 |
Four years before current fiscal year | 57,190 |
Prior | 162,103 |
Revolving Loans Amortized Cost Basis | 63,687 |
Total Loans | 896,202 | 775,554
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 141,987 |
Fiscal year before current fiscal year | 145,596 |
Two years before current fiscal year | 114,356 |
Three years before current fiscal year | 93,878 |
Four years before current fiscal year | 47,340 |
Prior | 129,610 |
Revolving Loans Amortized Cost Basis | 48,189 |
Total Loans | 720,956 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 30,513 |
Fiscal year before current fiscal year | 36,392 |
Two years before current fiscal year | 29,012 |
Three years before current fiscal year | 18,542 |
Four years before current fiscal year | 9,327 |
Prior | 30,565 |
Revolving Loans Amortized Cost Basis | 15,436 |
Total Loans | 169,787 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 126 |
Two years before current fiscal year | 76 |
Three years before current fiscal year | 1,302 |
Four years before current fiscal year | 337 |
Prior | 1,421 |
Revolving Loans Amortized Cost Basis | 62 |
Total Loans | 3,324 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 45 |
Fiscal year before current fiscal year | 269 |
Three years before current fiscal year | 1,128 |
Four years before current fiscal year | 186 |
Prior | 507 |
Total Loans | 2,135 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 293,303 |
Fiscal year before current fiscal year | 294,647 |
Two years before current fiscal year | 207,478 |
Three years before current fiscal year | 159,304 |
Four years before current fiscal year | 52,200 |
Prior | 152,812 |
Revolving Loans Amortized Cost Basis | 70,330 |
Total Loans | 1,230,074 | 1,095,324
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 198,064 |
Fiscal year before current fiscal year | 238,174 |
Two years before current fiscal year | 177,410 |
Three years before current fiscal year | 109,128 |
Four years before current fiscal year | 26,907 |
Prior | 77,085 |
Revolving Loans Amortized Cost Basis | 39,667 |
Total Loans | 866,435 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 88,113 |
Fiscal year before current fiscal year | 56,473 |
Two years before current fiscal year | 30,068 |
Three years before current fiscal year | 47,428 |
Four years before current fiscal year | 25,178 |
Prior | 72,943 |
Revolving Loans Amortized Cost Basis | 30,663 |
Total Loans | 350,866 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 7,126 |
Three years before current fiscal year | 2,748 |
Four years before current fiscal year | 79 |
Prior | 2,784 |
Total Loans | 12,737 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Four years before current fiscal year | 36 |
Total Loans | 36 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 168,489 |
Fiscal year before current fiscal year | 142,836 |
Two years before current fiscal year | 43,391 |
Three years before current fiscal year | 25,234 |
Four years before current fiscal year | 5,219 |
Prior | 6,743 |
Revolving Loans Amortized Cost Basis | 81,719 |
Total Loans | 473,631 | 415,466
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 138,067 |
Fiscal year before current fiscal year | 122,780 |
Two years before current fiscal year | 41,667 |
Three years before current fiscal year | 10,473 |
Four years before current fiscal year | 3,510 |
Prior | 5,479 |
Revolving Loans Amortized Cost Basis | 33,306 |
Total Loans | 355,282 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 29,324 |
Fiscal year before current fiscal year | 20,056 |
Two years before current fiscal year | 1,589 |
Three years before current fiscal year | 14,711 |
Four years before current fiscal year | 1,709 |
Prior | 1,249 |
Revolving Loans Amortized Cost Basis | 48,254 |
Total Loans | 116,892 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,098 |
Two years before current fiscal year | 102 |
Revolving Loans Amortized Cost Basis | 159 |
Total Loans | 1,359 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Two years before current fiscal year | 33 |
Three years before current fiscal year | 50 |
Prior | 15 |
Total Loans | 98 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 205,704 |
Fiscal year before current fiscal year | 55,721 |
Two years before current fiscal year | 440 |
Three years before current fiscal year | 22 |
Prior | 450 |
Revolving Loans Amortized Cost Basis | 48,831 |
Total Loans | 311,168 | 254,524
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 178,568 |
Fiscal year before current fiscal year | 47,012 |
Two years before current fiscal year | 261 |
Three years before current fiscal year | 22 |
Prior | 43 |
Revolving Loans Amortized Cost Basis | 46,695 |
Total Loans | 272,601 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 26,903 |
Fiscal year before current fiscal year | 8,606 |
Two years before current fiscal year | 179 |
Prior | 407 |
Revolving Loans Amortized Cost Basis | 2,136 |
Total Loans | 38,231 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 233 |
Total Loans | 233 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 103 |
Total Loans | 103 |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 288,089 |
Fiscal year before current fiscal year | 258,092 |
Two years before current fiscal year | 176,748 |
Three years before current fiscal year | 106,435 |
Four years before current fiscal year | 71,473 |
Prior | 191,951 |
Revolving Loans Amortized Cost Basis | 4,922 |
Total Loans | 1,097,710 | 937,006
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 251,829 |
Fiscal year before current fiscal year | 218,962 |
Two years before current fiscal year | 150,043 |
Three years before current fiscal year | 90,854 |
Four years before current fiscal year | 58,348 |
Prior | 146,667 |
Revolving Loans Amortized Cost Basis | 4,922 |
Total Loans | 921,625 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 34,687 |
Fiscal year before current fiscal year | 37,637 |
Two years before current fiscal year | 25,916 |
Three years before current fiscal year | 13,497 |
Four years before current fiscal year | 11,075 |
Prior | 39,349 |
Total Loans | 162,161 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,543 |
Fiscal year before current fiscal year | 1,171 |
Two years before current fiscal year | 651 |
Three years before current fiscal year | 1,516 |
Four years before current fiscal year | 1,870 |
Prior | 4,143 |
Total Loans | 10,894 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 30 |
Fiscal year before current fiscal year | 322 |
Two years before current fiscal year | 138 |
Three years before current fiscal year | 568 |
Four years before current fiscal year | 180 |
Prior | 1,792 |
Total Loans | 3,030 |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 28,874 |
Fiscal year before current fiscal year | 13,637 |
Two years before current fiscal year | 13,449 |
Three years before current fiscal year | 7,700 |
Four years before current fiscal year | 5,431 |
Prior | 15,455 |
Revolving Loans Amortized Cost Basis | 103,962 |
Total Loans | 188,508 | 161,018
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 24,287 |
Fiscal year before current fiscal year | 11,519 |
Two years before current fiscal year | 11,471 |
Three years before current fiscal year | 5,940 |
Four years before current fiscal year | 3,909 |
Prior | 11,865 |
Revolving Loans Amortized Cost Basis | 41,165 |
Total Loans | 110,156 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 4,387 |
Fiscal year before current fiscal year | 1,896 |
Two years before current fiscal year | 1,860 |
Three years before current fiscal year | 1,676 |
Four years before current fiscal year | 1,261 |
Prior | 2,646 |
Revolving Loans Amortized Cost Basis | 62,195 |
Total Loans | 75,921 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 200 |
Fiscal year before current fiscal year | 204 |
Two years before current fiscal year | 88 |
Three years before current fiscal year | 84 |
Four years before current fiscal year | 222 |
Prior | 890 |
Revolving Loans Amortized Cost Basis | 602 |
Total Loans | 2,290 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 18 |
Two years before current fiscal year | 30 |
Four years before current fiscal year | 39 |
Prior | 54 |
Total Loans | 141 |
Real Estate [Member] | Farmland [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 54,603 |
Fiscal year before current fiscal year | 51,834 |
Two years before current fiscal year | 39,552 |
Three years before current fiscal year | 28,709 |
Four years before current fiscal year | 16,260 |
Prior | 49,097 |
Revolving Loans Amortized Cost Basis | 16,766 |
Total Loans | 256,821 | 272,179
Real Estate [Member] | Farmland [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 39,963 |
Fiscal year before current fiscal year | 36,229 |
Two years before current fiscal year | 30,416 |
Three years before current fiscal year | 19,528 |
Four years before current fiscal year | 10,297 |
Prior | 30,735 |
Revolving Loans Amortized Cost Basis | 5,256 |
Total Loans | 172,424 |
Real Estate [Member] | Farmland [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 12,439 |
Fiscal year before current fiscal year | 15,174 |
Two years before current fiscal year | 6,903 |
Three years before current fiscal year | 7,816 |
Four years before current fiscal year | 5,835 |
Prior | 16,093 |
Revolving Loans Amortized Cost Basis | 9,619 |
Total Loans | 73,879 |
Real Estate [Member] | Farmland [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 2,201 |
Fiscal year before current fiscal year | 113 |
Two years before current fiscal year | 1,799 |
Three years before current fiscal year | 1,365 |
Four years before current fiscal year | 70 |
Prior | 2,057 |
Revolving Loans Amortized Cost Basis | 1,891 |
Total Loans | 9,496 |
Real Estate [Member] | Farmland [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 318 |
Two years before current fiscal year | 434 |
Four years before current fiscal year | 58 |
Prior | 212 |
Total Loans | 1,022 |
Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 323,293 |
Fiscal year before current fiscal year | 325,919 |
Two years before current fiscal year | 109,960 |
Three years before current fiscal year | 75,973 |
Four years before current fiscal year | 36,896 |
Prior | 53,191 |
Revolving Loans Amortized Cost Basis | 504,169 |
Total Loans | 1,429,401 | 1,416,093
Commercial and Agricultural Non-Real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 239,757 |
Fiscal year before current fiscal year | 257,163 |
Two years before current fiscal year | 83,658 |
Three years before current fiscal year | 58,217 |
Four years before current fiscal year | 17,413 |
Prior | 46,390 |
Revolving Loans Amortized Cost Basis | 361,517 |
Total Loans | 1,064,115 |
Commercial and Agricultural Non-Real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 79,522 |
Fiscal year before current fiscal year | 65,913 |
Two years before current fiscal year | 23,868 |
Three years before current fiscal year | 15,699 |
Four years before current fiscal year | 17,090 |
Prior | 4,710 |
Revolving Loans Amortized Cost Basis | 136,388 |
Total Loans | 343,190 |
Commercial and Agricultural Non-Real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 3,575 |
Fiscal year before current fiscal year | 2,290 |
Two years before current fiscal year | 1,843 |
Three years before current fiscal year | 936 |
Four years before current fiscal year | 1,896 |
Prior | 932 |
Revolving Loans Amortized Cost Basis | 6,094 |
Total Loans | 17,566 |
Commercial and Agricultural Non-Real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 439 |
Fiscal year before current fiscal year | 553 |
Two years before current fiscal year | 591 |
Three years before current fiscal year | 1,121 |
Four years before current fiscal year | 497 |
Prior | 1,159 |
Revolving Loans Amortized Cost Basis | 170 |
Total Loans | 4,530 |
Consumer Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 180,129 |
Fiscal year before current fiscal year | 134,462 |
Two years before current fiscal year | 51,898 |
Three years before current fiscal year | 29,343 |
Four years before current fiscal year | 9,709 |
Prior | 4,579 |
Revolving Loans Amortized Cost Basis | 21,793 |
Total Loans | 431,913 | 413,370
Consumer Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 163,610 |
Fiscal year before current fiscal year | 121,331 |
Two years before current fiscal year | 46,856 |
Three years before current fiscal year | 24,674 |
Four years before current fiscal year | 8,419 |
Prior | 2,989 |
Revolving Loans Amortized Cost Basis | 20,821 |
Total Loans | 388,700 |
Consumer Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 15,625 |
Fiscal year before current fiscal year | 12,007 |
Two years before current fiscal year | 4,564 |
Three years before current fiscal year | 4,113 |
Four years before current fiscal year | 1,079 |
Prior | 1,511 |
Revolving Loans Amortized Cost Basis | 968 |
Total Loans | 39,867 |
Consumer Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 663 |
Fiscal year before current fiscal year | 817 |
Two years before current fiscal year | 370 |
Three years before current fiscal year | 381 |
Four years before current fiscal year | 159 |
Prior | 67 |
Revolving Loans Amortized Cost Basis | 3 |
Total Loans | 2,460 |
Consumer Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 231 |
Fiscal year before current fiscal year | 307 |
Two years before current fiscal year | 108 |
Three years before current fiscal year | 175 |
Four years before current fiscal year | 52 |
Prior | 12 |
Revolving Loans Amortized Cost Basis | 1 |
Total Loans | 886 |
Oil and Gas [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 141,763 |
Fiscal year before current fiscal year | 86,305 |
Two years before current fiscal year | 27,741 |
Three years before current fiscal year | 20,519 |
Four years before current fiscal year | 20,980 |
Prior | 684 |
Revolving Loans Amortized Cost Basis | 214,352 |
Total Loans | 512,344 | $ 428,908
Oil and Gas [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 137,122 |
Fiscal year before current fiscal year | 76,145 |
Two years before current fiscal year | 24,844 |
Three years before current fiscal year | 864 |
Four years before current fiscal year | 1,732 |
Prior | 313 |
Revolving Loans Amortized Cost Basis | 175,742 |
Total Loans | 416,762 |
Oil and Gas [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 4,432 |
Fiscal year before current fiscal year | 4,603 |
Two years before current fiscal year | 2,890 |
Three years before current fiscal year | 19,655 |
Four years before current fiscal year | 19,248 |
Prior | 200 |
Revolving Loans Amortized Cost Basis | 36,964 |
Total Loans | 87,992 |
Oil and Gas [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 209 |
Fiscal year before current fiscal year | 4,557 |
Two years before current fiscal year | 7 |
Prior | 171 |
Revolving Loans Amortized Cost Basis | 1,646 |
Total Loans | 6,590 |
Oil and Gas [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 1,000 |
Total Loans | $ 1,000 |

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