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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, 2023 | Dec. 31, 2022
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Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | $ 1,778,095 |
Fiscal year before current fiscal year | 1,666,144 |
Two years before current fiscal year | 1,140,507 |
Three years before current fiscal year | 598,579 |
Four years before current fiscal year | 443,476 |
Prior | 675,202 |
Revolving Loans Amortized Cost Basis | 1,170,619 |
Total loans | 7,472,622 | $ 6,943,563
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 129,971 |
Fiscal year before current fiscal year | 217,176 |
Two years before current fiscal year | 162,237 |
Three years before current fiscal year | 112,921 |
Four years before current fiscal year | 106,493 |
Prior | 171,500 |
Revolving Loans Amortized Cost Basis | 60,570 |
Total loans | 960,868 | 908,494
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 99,990 |
Fiscal year before current fiscal year | 155,460 |
Two years before current fiscal year | 120,444 |
Three years before current fiscal year | 87,838 |
Four years before current fiscal year | 82,081 |
Prior | 139,298 |
Revolving Loans Amortized Cost Basis | 23,622 |
Total loans | 708,733 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 29,812 |
Fiscal year before current fiscal year | 57,975 |
Two years before current fiscal year | 37,289 |
Three years before current fiscal year | 23,581 |
Four years before current fiscal year | 21,509 |
Prior | 30,107 |
Revolving Loans Amortized Cost Basis | 34,361 |
Total loans | 234,634 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 142 |
Fiscal year before current fiscal year | 3,582 |
Two years before current fiscal year | 4,304 |
Three years before current fiscal year | 652 |
Four years before current fiscal year | 1,899 |
Prior | 1,075 |
Revolving Loans Amortized Cost Basis | 2,437 |
Total loans | 14,091 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 27 |
Fiscal year before current fiscal year | 159 |
Two years before current fiscal year | 200 |
Three years before current fiscal year | 850 |
Four years before current fiscal year | 665 |
Prior | 1,020 |
Revolving Loans Amortized Cost Basis | 150 |
Total loans | 3,071 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 5 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Four years before current fiscal year | 339 |
Total loans | 339 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 235,363 |
Fiscal year before current fiscal year | 418,523 |
Two years before current fiscal year | 260,164 |
Three years before current fiscal year | 176,538 |
Four years before current fiscal year | 129,169 |
Prior | 147,572 |
Revolving Loans Amortized Cost Basis | 76,502 |
Total loans | 1,443,831 | 1,383,150
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 160,303 |
Fiscal year before current fiscal year | 255,862 |
Two years before current fiscal year | 176,995 |
Three years before current fiscal year | 122,636 |
Four years before current fiscal year | 59,973 |
Prior | 72,918 |
Revolving Loans Amortized Cost Basis | 47,780 |
Total loans | 896,467 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 74,860 |
Fiscal year before current fiscal year | 155,293 |
Two years before current fiscal year | 81,452 |
Three years before current fiscal year | 53,753 |
Four years before current fiscal year | 62,989 |
Prior | 73,789 |
Revolving Loans Amortized Cost Basis | 28,722 |
Total loans | 530,858 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 6,736 |
Two years before current fiscal year | 1,717 |
Three years before current fiscal year | 149 |
Four years before current fiscal year | 6,207 |
Prior | 299 |
Total loans | 15,108 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 200 |
Fiscal year before current fiscal year | 632 |
Prior | 566 |
Total loans | 1,398 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 154,693 |
Fiscal year before current fiscal year | 175,378 |
Two years before current fiscal year | 106,340 |
Three years before current fiscal year | 15,210 |
Four years before current fiscal year | 20,414 |
Prior | 7,793 |
Revolving Loans Amortized Cost Basis | 95,824 |
Total loans | 575,652 | 475,236
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 91,548 |
Fiscal year before current fiscal year | 123,068 |
Two years before current fiscal year | 73,070 |
Three years before current fiscal year | 8,484 |
Four years before current fiscal year | 6,842 |
Prior | 5,403 |
Revolving Loans Amortized Cost Basis | 61,474 |
Total loans | 369,889 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 59,837 |
Fiscal year before current fiscal year | 50,514 |
Two years before current fiscal year | 33,168 |
Three years before current fiscal year | 6,629 |
Four years before current fiscal year | 13,572 |
Prior | 2,381 |
Revolving Loans Amortized Cost Basis | 34,350 |
Total loans | 200,451 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 3,308 |
Fiscal year before current fiscal year | 893 |
Two years before current fiscal year | 102 |
Three years before current fiscal year | 97 |
Prior | 7 |
Total loans | 4,407 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 903 |
Prior | 2 |
Total loans | 905 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 187,674 |
Fiscal year before current fiscal year | 46,891 |
Two years before current fiscal year | 1,473 |
Three years before current fiscal year | 124 |
Four years before current fiscal year | 2 |
Prior | 419 |
Revolving Loans Amortized Cost Basis | 37,728 |
Total loans | 274,311 | 303,305
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 136,871 |
Fiscal year before current fiscal year | 36,431 |
Two years before current fiscal year | 1,441 |
Three years before current fiscal year | 102 |
Four years before current fiscal year | 2 |
Prior | 37 |
Revolving Loans Amortized Cost Basis | 37,179 |
Total loans | 212,063 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 44,707 |
Fiscal year before current fiscal year | 9,530 |
Two years before current fiscal year | 32 |
Three years before current fiscal year | 22 |
Prior | 382 |
Revolving Loans Amortized Cost Basis | 549 |
Total loans | 55,222 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 5,730 |
Fiscal year before current fiscal year | 387 |
Total loans | 6,117 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 366 |
Fiscal year before current fiscal year | 543 |
Total loans | 909 |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 267,873 |
Fiscal year before current fiscal year | 281,659 |
Two years before current fiscal year | 220,274 |
Three years before current fiscal year | 148,438 |
Four years before current fiscal year | 89,679 |
Prior | 205,667 |
Revolving Loans Amortized Cost Basis | 2,918 |
Total loans | 1,216,508 | 1,117,899
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 223,552 |
Fiscal year before current fiscal year | 238,614 |
Two years before current fiscal year | 177,122 |
Three years before current fiscal year | 121,747 |
Four years before current fiscal year | 74,016 |
Prior | 155,802 |
Revolving Loans Amortized Cost Basis | 2,918 |
Total loans | 993,771 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 41,655 |
Fiscal year before current fiscal year | 40,971 |
Two years before current fiscal year | 39,280 |
Three years before current fiscal year | 25,018 |
Four years before current fiscal year | 13,617 |
Prior | 43,460 |
Total loans | 204,001 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 2,282 |
Fiscal year before current fiscal year | 1,902 |
Two years before current fiscal year | 2,626 |
Three years before current fiscal year | 1,327 |
Four years before current fiscal year | 1,606 |
Prior | 4,202 |
Total loans | 13,945 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 384 |
Fiscal year before current fiscal year | 172 |
Two years before current fiscal year | 1,246 |
Three years before current fiscal year | 346 |
Four years before current fiscal year | 440 |
Prior | 2,203 |
Total loans | 4,791 |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 38,666 |
Fiscal year before current fiscal year | 32,804 |
Two years before current fiscal year | 10,450 |
Three years before current fiscal year | 10,242 |
Four years before current fiscal year | 5,645 |
Prior | 16,802 |
Revolving Loans Amortized Cost Basis | 115,788 |
Total loans | 230,397 | 196,198
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 35,422 |
Fiscal year before current fiscal year | 27,339 |
Two years before current fiscal year | 8,166 |
Three years before current fiscal year | 8,242 |
Four years before current fiscal year | 3,963 |
Prior | 13,045 |
Revolving Loans Amortized Cost Basis | 41,474 |
Total loans | 137,651 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 2,828 |
Fiscal year before current fiscal year | 5,088 |
Two years before current fiscal year | 2,210 |
Three years before current fiscal year | 1,958 |
Four years before current fiscal year | 1,546 |
Prior | 3,272 |
Revolving Loans Amortized Cost Basis | 71,527 |
Total loans | 88,429 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 416 |
Fiscal year before current fiscal year | 353 |
Two years before current fiscal year | 74 |
Three years before current fiscal year | 42 |
Four years before current fiscal year | 41 |
Prior | 440 |
Revolving Loans Amortized Cost Basis | 1,925 |
Total loans | 3,291 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 24 |
Four years before current fiscal year | 95 |
Prior | 45 |
Revolving Loans Amortized Cost Basis | 862 |
Total loans | 1,026 |
Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 84,850 |
Fiscal year before current fiscal year | 81,414 |
Two years before current fiscal year | 56,745 |
Three years before current fiscal year | 43,154 |
Four years before current fiscal year | 27,939 |
Prior | 53,896 |
Revolving Loans Amortized Cost Basis | 77,932 |
Total loans | 425,930 | 408,037
Real Estate [Member] | Agriculture [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 47,552 |
Fiscal year before current fiscal year | 55,420 |
Two years before current fiscal year | 35,685 |
Three years before current fiscal year | 29,284 |
Four years before current fiscal year | 17,863 |
Prior | 33,652 |
Revolving Loans Amortized Cost Basis | 39,462 |
Total loans | 258,918 |
Real Estate [Member] | Agriculture [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 28,366 |
Fiscal year before current fiscal year | 24,237 |
Two years before current fiscal year | 19,989 |
Three years before current fiscal year | 10,303 |
Four years before current fiscal year | 9,369 |
Prior | 17,304 |
Revolving Loans Amortized Cost Basis | 35,554 |
Total loans | 145,122 |
Real Estate [Member] | Agriculture [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 8,891 |
Fiscal year before current fiscal year | 856 |
Two years before current fiscal year | 854 |
Three years before current fiscal year | 3,433 |
Four years before current fiscal year | 323 |
Prior | 2,696 |
Revolving Loans Amortized Cost Basis | 2,896 |
Total loans | 19,949 |
Real Estate [Member] | Agriculture [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 41 |
Fiscal year before current fiscal year | 901 |
Two years before current fiscal year | 217 |
Three years before current fiscal year | 134 |
Four years before current fiscal year | 384 |
Prior | 244 |
Revolving Loans Amortized Cost Basis | 20 |
Total loans | 1,941 |
Commercial Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 288,089 |
Fiscal year before current fiscal year | 234,558 |
Two years before current fiscal year | 194,909 |
Three years before current fiscal year | 56,425 |
Four years before current fiscal year | 50,203 |
Prior | 49,729 |
Revolving Loans Amortized Cost Basis | 422,883 |
Total loans | 1,296,796 | 1,241,454
Commercial Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 204,828 |
Fiscal year before current fiscal year | 186,934 |
Two years before current fiscal year | 167,915 |
Three years before current fiscal year | 40,328 |
Four years before current fiscal year | 39,003 |
Prior | 39,326 |
Revolving Loans Amortized Cost Basis | 281,116 |
Total loans | 959,450 |
Commercial Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 80,383 |
Fiscal year before current fiscal year | 43,067 |
Two years before current fiscal year | 25,617 |
Three years before current fiscal year | 15,244 |
Four years before current fiscal year | 10,064 |
Prior | 9,171 |
Revolving Loans Amortized Cost Basis | 137,965 |
Total loans | 321,511 |
Commercial Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,840 |
Fiscal year before current fiscal year | 3,149 |
Two years before current fiscal year | 1,073 |
Three years before current fiscal year | 163 |
Four years before current fiscal year | 563 |
Prior | 1,103 |
Revolving Loans Amortized Cost Basis | 2,648 |
Total loans | 10,539 |
Commercial Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,038 |
Fiscal year before current fiscal year | 1,408 |
Two years before current fiscal year | 304 |
Three years before current fiscal year | 690 |
Four years before current fiscal year | 309 |
Prior | 129 |
Revolving Loans Amortized Cost Basis | 1,154 |
Total loans | 5,032 |
Commercial Non-real Estate [Member] | Grade 5 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Four years before current fiscal year | 264 |
Total loans | 264 |
Consumer Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 191,515 |
Fiscal year before current fiscal year | 141,784 |
Two years before current fiscal year | 73,413 |
Three years before current fiscal year | 25,261 |
Four years before current fiscal year | 11,983 |
Prior | 5,299 |
Revolving Loans Amortized Cost Basis | 26,466 |
Total loans | 475,721 | 446,756
Consumer Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 175,483 |
Fiscal year before current fiscal year | 123,675 |
Two years before current fiscal year | 64,280 |
Three years before current fiscal year | 22,331 |
Four years before current fiscal year | 10,804 |
Prior | 3,518 |
Revolving Loans Amortized Cost Basis | 24,688 |
Total loans | 424,779 |
Consumer Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 15,347 |
Fiscal year before current fiscal year | 16,509 |
Two years before current fiscal year | 7,792 |
Three years before current fiscal year | 2,502 |
Four years before current fiscal year | 809 |
Prior | 1,614 |
Revolving Loans Amortized Cost Basis | 1,764 |
Total loans | 46,337 |
Consumer Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 562 |
Fiscal year before current fiscal year | 1,198 |
Two years before current fiscal year | 957 |
Three years before current fiscal year | 325 |
Four years before current fiscal year | 285 |
Prior | 155 |
Revolving Loans Amortized Cost Basis | 12 |
Total loans | 3,494 |
Consumer Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 123 |
Fiscal year before current fiscal year | 402 |
Two years before current fiscal year | 384 |
Three years before current fiscal year | 103 |
Four years before current fiscal year | 85 |
Prior | 12 |
Revolving Loans Amortized Cost Basis | 2 |
Total loans | 1,111 |
Oil and Gas [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 199,401 |
Fiscal year before current fiscal year | 35,957 |
Two years before current fiscal year | 54,502 |
Three years before current fiscal year | 10,266 |
Four years before current fiscal year | 1,949 |
Prior | 16,525 |
Revolving Loans Amortized Cost Basis | 254,008 |
Total loans | 572,608 | $ 463,034
Oil and Gas [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 157,820 |
Fiscal year before current fiscal year | 26,772 |
Two years before current fiscal year | 52,090 |
Three years before current fiscal year | 9,850 |
Four years before current fiscal year | 1,630 |
Prior | 16,141 |
Revolving Loans Amortized Cost Basis | 170,256 |
Total loans | 434,559 |
Oil and Gas [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 41,447 |
Fiscal year before current fiscal year | 7,180 |
Two years before current fiscal year | 1,999 |
Three years before current fiscal year | 414 |
Four years before current fiscal year | 306 |
Prior | 217 |
Revolving Loans Amortized Cost Basis | 83,009 |
Total loans | 134,572 |
Oil and Gas [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 134 |
Fiscal year before current fiscal year | 1,922 |
Two years before current fiscal year | 413 |
Three years before current fiscal year | 2 |
Four years before current fiscal year | 13 |
Prior | 167 |
Revolving Loans Amortized Cost Basis | 743 |
Total loans | 3,394 |
Oil and Gas [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 83 |
Total loans | $ 83 |

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