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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 | Mar. 31, 2023 | Dec. 31, 2022
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Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | $ 614,527 |
Fiscal year before current fiscal year | 2,049,307 |
Two years before current fiscal year | 1,322,022 |
Three years before current fiscal year | 713,171 |
Four years before current fiscal year | 521,371 |
Prior | 783,261 |
Revolving Loans Amortized Cost Basis | 1,114,949 |
Total loans | 7,118,608 | $ 6,943,563
Fiscal year before current fiscal year gross charge-offs | 158 |
Two years before current fiscal year gross charge-offs | 114 |
Three years before current fiscal year gross charge-offs | 53 |
Four years before current fiscal year gross charge-offs | 41 |
Prior gross charge-offs | 64 |
Revolving Loans Amortized Cost Basis gross charge-offs | 2 |
Current-period gross charge-offs | 432 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 42,191 |
Fiscal year before current fiscal year | 209,422 |
Two years before current fiscal year | 171,573 |
Three years before current fiscal year | 124,667 |
Four years before current fiscal year | 109,694 |
Prior | 192,973 |
Revolving Loans Amortized Cost Basis | 69,584 |
Total loans | 920,104 | 908,494
Fiscal year before current fiscal year gross charge-offs | 7 |
Two years before current fiscal year gross charge-offs | 1 |
Three years before current fiscal year gross charge-offs | 22 |
Four years before current fiscal year gross charge-offs | 18 |
Current-period gross charge-offs | 48 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 26,840 |
Fiscal year before current fiscal year | 171,896 |
Two years before current fiscal year | 136,273 |
Three years before current fiscal year | 98,471 |
Four years before current fiscal year | 87,267 |
Prior | 158,659 |
Revolving Loans Amortized Cost Basis | 50,504 |
Total loans | 729,910 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 15,333 |
Fiscal year before current fiscal year | 37,268 |
Two years before current fiscal year | 33,356 |
Three years before current fiscal year | 25,810 |
Four years before current fiscal year | 20,013 |
Prior | 32,197 |
Revolving Loans Amortized Cost Basis | 19,018 |
Total loans | 182,995 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 18 |
Fiscal year before current fiscal year | 6 |
Two years before current fiscal year | 1,694 |
Three years before current fiscal year | 75 |
Four years before current fiscal year | 1,277 |
Prior | 1,469 |
Revolving Loans Amortized Cost Basis | 62 |
Total loans | 4,601 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 252 |
Two years before current fiscal year | 250 |
Three years before current fiscal year | 311 |
Four years before current fiscal year | 798 |
Prior | 648 |
Total loans | 2,259 |
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 | 53,529 |
Fiscal year before current fiscal year | 464,090 |
Two years before current fiscal year | 288,728 |
Three years before current fiscal year | 193,773 |
Four years before current fiscal year | 153,209 |
Prior | 167,433 |
Revolving Loans Amortized Cost Basis | 75,638 |
Total loans | 1,396,400 | 1,383,150
Prior gross charge-offs | 3 |
Current-period gross charge-offs | 3 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 40,007 |
Fiscal year before current fiscal year | 333,790 |
Two years before current fiscal year | 239,906 |
Three years before current fiscal year | 164,977 |
Four years before current fiscal year | 106,365 |
Prior | 86,491 |
Revolving Loans Amortized Cost Basis | 44,389 |
Total loans | 1,015,925 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 13,477 |
Fiscal year before current fiscal year | 122,684 |
Two years before current fiscal year | 48,822 |
Three years before current fiscal year | 28,644 |
Four years before current fiscal year | 36,980 |
Prior | 79,557 |
Revolving Loans Amortized Cost Basis | 31,249 |
Total loans | 361,413 |
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 | 6,996 |
Three years before current fiscal year | 152 |
Four years before current fiscal year | 9,864 |
Prior | 1,343 |
Total loans | 18,355 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 45 |
Fiscal year before current fiscal year | 620 |
Prior | 42 |
Total loans | 707 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 50,741 |
Fiscal year before current fiscal year | 204,522 |
Two years before current fiscal year | 97,199 |
Three years before current fiscal year | 47,055 |
Four years before current fiscal year | 19,148 |
Prior | 9,354 |
Revolving Loans Amortized Cost Basis | 106,828 |
Total loans | 534,847 | 475,236
Fiscal year before current fiscal year gross charge-offs | 2 |
Current-period gross charge-offs | 2 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 44,459 |
Fiscal year before current fiscal year | 152,820 |
Two years before current fiscal year | 80,373 |
Three years before current fiscal year | 39,720 |
Four years before current fiscal year | 5,063 |
Prior | 6,975 |
Revolving Loans Amortized Cost Basis | 51,743 |
Total loans | 381,153 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 3,757 |
Fiscal year before current fiscal year | 50,735 |
Two years before current fiscal year | 16,826 |
Three years before current fiscal year | 7,203 |
Four years before current fiscal year | 14,085 |
Prior | 2,372 |
Revolving Loans Amortized Cost Basis | 54,929 |
Total loans | 149,907 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 2,525 |
Fiscal year before current fiscal year | 886 |
Three years before current fiscal year | 99 |
Prior | 7 |
Revolving Loans Amortized Cost Basis | 156 |
Total loans | 3,673 |
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 | 81 |
Three years before current fiscal year | 33 |
Total loans | 114 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 68,235 |
Fiscal year before current fiscal year | 193,401 |
Two years before current fiscal year | 4,750 |
Three years before current fiscal year | 304 |
Four years before current fiscal year | 13 |
Prior | 433 |
Revolving Loans Amortized Cost Basis | 37,630 |
Total loans | 304,766 | 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 | 59,006 |
Fiscal year before current fiscal year | 156,832 |
Two years before current fiscal year | 4,707 |
Three years before current fiscal year | 258 |
Four years before current fiscal year | 13 |
Prior | 39 |
Revolving Loans Amortized Cost Basis | 35,474 |
Total loans | 256,329 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 8,841 |
Fiscal year before current fiscal year | 35,304 |
Two years before current fiscal year | 43 |
Three years before current fiscal year | 46 |
Prior | 394 |
Revolving Loans Amortized Cost Basis | 2,156 |
Total loans | 46,784 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 1,265 |
Total loans | 1,265 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 388 |
Total loans | 388 |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 86,828 |
Fiscal year before current fiscal year | 327,013 |
Two years before current fiscal year | 235,796 |
Three years before current fiscal year | 162,190 |
Four years before current fiscal year | 97,518 |
Prior | 232,762 |
Revolving Loans Amortized Cost Basis | 5,693 |
Total loans | 1,147,800 | 1,117,899
Prior gross charge-offs | 2 |
Current-period gross charge-offs | 2 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 77,619 |
Fiscal year before current fiscal year | 281,309 |
Two years before current fiscal year | 197,623 |
Three years before current fiscal year | 135,722 |
Four years before current fiscal year | 82,252 |
Prior | 180,597 |
Revolving Loans Amortized Cost Basis | 5,693 |
Total loans | 960,815 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 8,715 |
Fiscal year before current fiscal year | 43,684 |
Two years before current fiscal year | 35,764 |
Three years before current fiscal year | 25,194 |
Four years before current fiscal year | 13,434 |
Prior | 46,291 |
Total loans | 173,082 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 428 |
Fiscal year before current fiscal year | 1,910 |
Two years before current fiscal year | 1,254 |
Three years before current fiscal year | 905 |
Four years before current fiscal year | 1,587 |
Prior | 3,937 |
Total loans | 10,021 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 66 |
Fiscal year before current fiscal year | 110 |
Two years before current fiscal year | 1,155 |
Three years before current fiscal year | 369 |
Four years before current fiscal year | 245 |
Prior | 1,937 |
Total loans | 3,882 |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 9,541 |
Fiscal year before current fiscal year | 36,654 |
Two years before current fiscal year | 12,009 |
Three years before current fiscal year | 11,688 |
Four years before current fiscal year | 6,683 |
Prior | 19,059 |
Revolving Loans Amortized Cost Basis | 110,768 |
Total loans | 206,402 | 196,198
Fiscal year before current fiscal year gross charge-offs | 2 |
Two years before current fiscal year gross charge-offs | 19 |
Four years before current fiscal year gross charge-offs | 1 |
Prior gross charge-offs | 4 |
Current-period gross charge-offs | 26 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 8,382 |
Fiscal year before current fiscal year | 30,718 |
Two years before current fiscal year | 9,868 |
Three years before current fiscal year | 9,884 |
Four years before current fiscal year | 5,061 |
Prior | 14,304 |
Revolving Loans Amortized Cost Basis | 41,871 |
Total loans | 120,088 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 987 |
Fiscal year before current fiscal year | 5,712 |
Two years before current fiscal year | 2,002 |
Three years before current fiscal year | 1,729 |
Four years before current fiscal year | 1,500 |
Prior | 3,624 |
Revolving Loans Amortized Cost Basis | 66,883 |
Total loans | 82,437 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 172 |
Fiscal year before current fiscal year | 224 |
Two years before current fiscal year | 139 |
Three years before current fiscal year | 48 |
Four years before current fiscal year | 122 |
Prior | 1,113 |
Revolving Loans Amortized Cost Basis | 1,242 |
Total loans | 3,060 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Three years before current fiscal year | 27 |
Prior | 18 |
Revolving Loans Amortized Cost Basis | 772 |
Total loans | 817 |
Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 28,037 |
Fiscal year before current fiscal year | 101,114 |
Two years before current fiscal year | 64,557 |
Three years before current fiscal year | 47,505 |
Four years before current fiscal year | 30,989 |
Prior | 62,872 |
Revolving Loans Amortized Cost Basis | 87,414 |
Total loans | 422,488 | 408,037
Fiscal year before current fiscal year gross charge-offs | 4 |
Three years before current fiscal year gross charge-offs | 16 |
Four years before current fiscal year gross charge-offs | 13 |
Prior gross charge-offs | 2 |
Current-period gross charge-offs | 35 |
Real Estate [Member] | Agriculture [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 16,685 |
Fiscal year before current fiscal year | 69,811 |
Two years before current fiscal year | 42,014 |
Three years before current fiscal year | 34,467 |
Four years before current fiscal year | 20,604 |
Prior | 39,693 |
Revolving Loans Amortized Cost Basis | 49,791 |
Total loans | 273,065 |
Real Estate [Member] | Agriculture [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 10,701 |
Fiscal year before current fiscal year | 24,320 |
Two years before current fiscal year | 21,468 |
Three years before current fiscal year | 9,205 |
Four years before current fiscal year | 10,223 |
Prior | 19,584 |
Revolving Loans Amortized Cost Basis | 32,697 |
Total loans | 128,198 |
Real Estate [Member] | Agriculture [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 592 |
Fiscal year before current fiscal year | 6,337 |
Two years before current fiscal year | 977 |
Three years before current fiscal year | 3,356 |
Four years before current fiscal year | 112 |
Prior | 3,290 |
Revolving Loans Amortized Cost Basis | 4,896 |
Total loans | 19,560 |
Real Estate [Member] | Agriculture [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 59 |
Fiscal year before current fiscal year | 646 |
Two years before current fiscal year | 98 |
Three years before current fiscal year | 477 |
Four years before current fiscal year | 50 |
Prior | 305 |
Revolving Loans Amortized Cost Basis | 30 |
Total loans | 1,665 |
Commercial Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 132,138 |
Fiscal year before current fiscal year | 289,141 |
Two years before current fiscal year | 232,806 |
Three years before current fiscal year | 75,357 |
Four years before current fiscal year | 59,896 |
Prior | 71,002 |
Revolving Loans Amortized Cost Basis | 402,397 |
Total loans | 1,262,737 | 1,241,454
Fiscal year before current fiscal year gross charge-offs | 67 |
Two years before current fiscal year gross charge-offs | 62 |
Prior gross charge-offs | 47 |
Current-period gross charge-offs | 176 |
Commercial Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 108,823 |
Fiscal year before current fiscal year | 212,982 |
Two years before current fiscal year | 189,496 |
Three years before current fiscal year | 58,782 |
Four years before current fiscal year | 45,803 |
Prior | 47,346 |
Revolving Loans Amortized Cost Basis | 305,503 |
Total loans | 968,735 |
Commercial Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 22,343 |
Fiscal year before current fiscal year | 73,851 |
Two years before current fiscal year | 42,567 |
Three years before current fiscal year | 15,526 |
Four years before current fiscal year | 12,546 |
Prior | 21,578 |
Revolving Loans Amortized Cost Basis | 94,656 |
Total loans | 283,067 |
Commercial Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 952 |
Fiscal year before current fiscal year | 2,000 |
Two years before current fiscal year | 392 |
Three years before current fiscal year | 308 |
Four years before current fiscal year | 675 |
Prior | 1,773 |
Revolving Loans Amortized Cost Basis | 2,035 |
Total loans | 8,135 |
Commercial Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 20 |
Fiscal year before current fiscal year | 308 |
Two years before current fiscal year | 351 |
Three years before current fiscal year | 741 |
Four years before current fiscal year | 608 |
Prior | 305 |
Revolving Loans Amortized Cost Basis | 203 |
Total loans | 2,536 |
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 | 60,430 |
Fiscal year before current fiscal year | 194,451 |
Two years before current fiscal year | 100,392 |
Three years before current fiscal year | 37,238 |
Four years before current fiscal year | 18,939 |
Prior | 8,933 |
Revolving Loans Amortized Cost Basis | 21,114 |
Total loans | 441,497 | 446,756
Fiscal year before current fiscal year gross charge-offs | 76 |
Two years before current fiscal year gross charge-offs | 32 |
Three years before current fiscal year gross charge-offs | 15 |
Four years before current fiscal year gross charge-offs | 9 |
Prior gross charge-offs | 6 |
Revolving Loans Amortized Cost Basis gross charge-offs | 2 |
Current-period gross charge-offs | 140 |
Consumer Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 56,874 |
Fiscal year before current fiscal year | 174,237 |
Two years before current fiscal year | 89,897 |
Three years before current fiscal year | 33,413 |
Four years before current fiscal year | 17,326 |
Prior | 6,763 |
Revolving Loans Amortized Cost Basis | 19,788 |
Total loans | 398,298 |
Consumer Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 3,455 |
Fiscal year before current fiscal year | 19,044 |
Two years before current fiscal year | 9,375 |
Three years before current fiscal year | 3,409 |
Four years before current fiscal year | 1,301 |
Prior | 1,961 |
Revolving Loans Amortized Cost Basis | 1,156 |
Total loans | 39,701 |
Consumer Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 101 |
Fiscal year before current fiscal year | 831 |
Two years before current fiscal year | 738 |
Three years before current fiscal year | 372 |
Four years before current fiscal year | 152 |
Prior | 149 |
Revolving Loans Amortized Cost Basis | 170 |
Total loans | 2,513 |
Consumer Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 339 |
Two years before current fiscal year | 382 |
Three years before current fiscal year | 44 |
Four years before current fiscal year | 160 |
Prior | 60 |
Total loans | 985 |
Oil and Gas [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 82,857 |
Fiscal year before current fiscal year | 29,499 |
Two years before current fiscal year | 114,212 |
Three years before current fiscal year | 13,394 |
Four years before current fiscal year | 25,282 |
Prior | 18,440 |
Revolving Loans Amortized Cost Basis | 197,883 |
Total loans | 481,567 | $ 463,034
Oil and Gas [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 81,777 |
Fiscal year before current fiscal year | 21,451 |
Two years before current fiscal year | 110,461 |
Three years before current fiscal year | 12,661 |
Four years before current fiscal year | 3,861 |
Prior | 2,469 |
Revolving Loans Amortized Cost Basis | 167,211 |
Total loans | 399,891 |
Oil and Gas [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,080 |
Fiscal year before current fiscal year | 5,968 |
Two years before current fiscal year | 3,504 |
Three years before current fiscal year | 729 |
Four years before current fiscal year | 21,421 |
Prior | 15,971 |
Revolving Loans Amortized Cost Basis | 29,233 |
Total loans | 77,906 |
Oil and Gas [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 2,080 |
Two years before current fiscal year | 247 |
Three years before current fiscal year | 4 |
Revolving Loans Amortized Cost Basis | 1,439 |
Total loans | $ 3,770 |

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