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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 | Jun. 30, 2024 | Dec. 31, 2023
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Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | $ 1,124,047 |
Fiscal year before current fiscal year | 1,658,230 |
Two years before current fiscal year | 1,498,663 |
Three years before current fiscal year | 978,072 |
Four years before current fiscal year | 529,805 |
Prior | 861,507 |
Revolving Loans Amortized Cost Basis | 1,397,124 |
Total Loans | 8,047,448 | $ 7,656,645
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 62,479 |
Fiscal year before current fiscal year | 147,224 |
Two years before current fiscal year | 204,593 |
Three years before current fiscal year | 160,011 |
Four years before current fiscal year | 102,000 |
Prior | 226,559 |
Revolving Loans Amortized Cost Basis | 52,076 |
Total Loans | 954,942 | 960,944
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 39,257 |
Fiscal year before current fiscal year | 104,695 |
Two years before current fiscal year | 151,859 |
Three years before current fiscal year | 111,308 |
Four years before current fiscal year | 78,999 |
Prior | 186,219 |
Revolving Loans Amortized Cost Basis | 25,667 |
Total Loans | 698,004 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 23,094 |
Fiscal year before current fiscal year | 34,818 |
Two years before current fiscal year | 49,139 |
Three years before current fiscal year | 44,044 |
Four years before current fiscal year | 21,710 |
Prior | 34,604 |
Revolving Loans Amortized Cost Basis | 24,187 |
Total Loans | 231,596 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 128 |
Fiscal year before current fiscal year | 7,339 |
Two years before current fiscal year | 3,574 |
Three years before current fiscal year | 4,489 |
Four years before current fiscal year | 939 |
Prior | 4,121 |
Revolving Loans Amortized Cost Basis | 2,100 |
Total Loans | 22,690 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 372 |
Two years before current fiscal year | 21 |
Three years before current fiscal year | 170 |
Four years before current fiscal year | 352 |
Prior | 1,615 |
Revolving Loans Amortized Cost Basis | 122 |
Total Loans | 2,652 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 134,947 |
Fiscal year before current fiscal year | 365,494 |
Two years before current fiscal year | 423,997 |
Three years before current fiscal year | 278,687 |
Four years before current fiscal year | 158,255 |
Prior | 198,537 |
Revolving Loans Amortized Cost Basis | 44,215 |
Total Loans | 1,604,132 | 1,486,420
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 64,168 |
Fiscal year before current fiscal year | 258,439 |
Two years before current fiscal year | 283,026 |
Three years before current fiscal year | 187,391 |
Four years before current fiscal year | 120,052 |
Prior | 126,177 |
Revolving Loans Amortized Cost Basis | 41,093 |
Total Loans | 1,080,346 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 61,660 |
Fiscal year before current fiscal year | 104,871 |
Two years before current fiscal year | 126,693 |
Three years before current fiscal year | 89,290 |
Four years before current fiscal year | 38,105 |
Prior | 71,591 |
Revolving Loans Amortized Cost Basis | 3,122 |
Total Loans | 495,332 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 8,934 |
Fiscal year before current fiscal year | 141 |
Two years before current fiscal year | 13,635 |
Three years before current fiscal year | 1,690 |
Prior | 245 |
Total Loans | 24,645 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 185 |
Fiscal year before current fiscal year | 2,043 |
Two years before current fiscal year | 643 |
Three years before current fiscal year | 316 |
Four years before current fiscal year | 98 |
Prior | 524 |
Total Loans | 3,809 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 117,239 |
Fiscal year before current fiscal year | 196,548 |
Two years before current fiscal year | 209,514 |
Three years before current fiscal year | 42,100 |
Four years before current fiscal year | 11,649 |
Prior | 22,628 |
Revolving Loans Amortized Cost Basis | 81,129 |
Total Loans | 680,807 | 642,643
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 49,830 |
Fiscal year before current fiscal year | 76,166 |
Two years before current fiscal year | 146,196 |
Three years before current fiscal year | 33,350 |
Four years before current fiscal year | 9,848 |
Prior | 7,591 |
Revolving Loans Amortized Cost Basis | 51,139 |
Total Loans | 374,120 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 64,768 |
Fiscal year before current fiscal year | 118,553 |
Two years before current fiscal year | 62,487 |
Three years before current fiscal year | 8,296 |
Four years before current fiscal year | 1,590 |
Prior | 14,969 |
Revolving Loans Amortized Cost Basis | 10,703 |
Total Loans | 281,366 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 2,641 |
Fiscal year before current fiscal year | 1,829 |
Two years before current fiscal year | 0 |
Three years before current fiscal year | 354 |
Four years before current fiscal year | 71 |
Prior | 68 |
Revolving Loans Amortized Cost Basis | 19,287 |
Total Loans | 24,250 |
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 | 0 |
Two years before current fiscal year | 831 |
Three years before current fiscal year | 100 |
Four years before current fiscal year | 140 |
Total Loans | 1,071 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 136,723 |
Fiscal year before current fiscal year | 82,742 |
Two years before current fiscal year | 18,575 |
Three years before current fiscal year | 8,177 |
Four years before current fiscal year | 110 |
Prior | 546 |
Revolving Loans Amortized Cost Basis | 42,027 |
Total Loans | 288,900 | 283,486
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 78,419 |
Fiscal year before current fiscal year | 48,981 |
Two years before current fiscal year | 15,922 |
Three years before current fiscal year | 8,162 |
Four years before current fiscal year | 98 |
Prior | 546 |
Revolving Loans Amortized Cost Basis | 30,001 |
Total Loans | 182,129 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 54,233 |
Fiscal year before current fiscal year | 33,153 |
Two years before current fiscal year | 2,447 |
Three years before current fiscal year | 15 |
Four years before current fiscal year | 12 |
Prior | 0 |
Revolving Loans Amortized Cost Basis | 11,630 |
Total Loans | 101,490 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 3,503 |
Fiscal year before current fiscal year | 408 |
Two years before current fiscal year | 0 |
Three years before current fiscal year | 0 |
Prior | 0 |
Revolving Loans Amortized Cost Basis | 396 |
Total Loans | 4,307 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 568 |
Fiscal year before current fiscal year | 200 |
Two years before current fiscal year | 206 |
Total Loans | 974 |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 180,475 |
Fiscal year before current fiscal year | 279,820 |
Two years before current fiscal year | 258,826 |
Three years before current fiscal year | 202,783 |
Four years before current fiscal year | 158,845 |
Prior | 248,825 |
Revolving Loans Amortized Cost Basis | 5,550 |
Total Loans | 1,335,124 | 1,258,744
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 134,305 |
Fiscal year before current fiscal year | 211,033 |
Two years before current fiscal year | 205,048 |
Three years before current fiscal year | 162,128 |
Four years before current fiscal year | 130,865 |
Prior | 192,862 |
Revolving Loans Amortized Cost Basis | 5,031 |
Total Loans | 1,041,272 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 43,810 |
Fiscal year before current fiscal year | 65,488 |
Two years before current fiscal year | 50,368 |
Three years before current fiscal year | 37,025 |
Four years before current fiscal year | 25,620 |
Prior | 48,645 |
Revolving Loans Amortized Cost Basis | 519 |
Total Loans | 271,475 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,453 |
Fiscal year before current fiscal year | 2,576 |
Two years before current fiscal year | 3,098 |
Three years before current fiscal year | 2,835 |
Four years before current fiscal year | 1,821 |
Prior | 5,562 |
Total Loans | 17,345 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 907 |
Fiscal year before current fiscal year | 646 |
Two years before current fiscal year | 312 |
Three years before current fiscal year | 795 |
Four years before current fiscal year | 539 |
Prior | 1,756 |
Total Loans | 4,955 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 5 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 77 |
Prior | 0 |
Total Loans | 77 |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 23,361 |
Fiscal year before current fiscal year | 40,041 |
Two years before current fiscal year | 25,668 |
Three years before current fiscal year | 8,029 |
Four years before current fiscal year | 8,953 |
Prior | 17,338 |
Revolving Loans Amortized Cost Basis | 136,646 |
Total Loans | 260,036 | 244,696
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 18,801 |
Fiscal year before current fiscal year | 34,325 |
Two years before current fiscal year | 21,028 |
Three years before current fiscal year | 6,512 |
Four years before current fiscal year | 7,196 |
Prior | 12,957 |
Revolving Loans Amortized Cost Basis | 54,939 |
Total Loans | 155,758 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 3,804 |
Fiscal year before current fiscal year | 5,198 |
Two years before current fiscal year | 4,467 |
Three years before current fiscal year | 1,341 |
Four years before current fiscal year | 1,462 |
Prior | 3,918 |
Revolving Loans Amortized Cost Basis | 79,266 |
Total Loans | 99,456 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 756 |
Fiscal year before current fiscal year | 344 |
Two years before current fiscal year | 106 |
Three years before current fiscal year | 176 |
Four years before current fiscal year | 295 |
Prior | 437 |
Revolving Loans Amortized Cost Basis | 1,507 |
Total Loans | 3,621 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 174 |
Two years before current fiscal year | 67 |
Three years before current fiscal year | 0 |
Prior | 26 |
Revolving Loans Amortized Cost Basis | 934 |
Total Loans | 1,201 |
Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 56,745 |
Fiscal year before current fiscal year | 67,532 |
Two years before current fiscal year | 67,447 |
Three years before current fiscal year | 48,874 |
Four years before current fiscal year | 34,957 |
Prior | 69,446 |
Revolving Loans Amortized Cost Basis | 87,359 |
Total Loans | 432,360 | 427,139
Real Estate [Member] | Agriculture [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 26,725 |
Fiscal year before current fiscal year | 36,340 |
Two years before current fiscal year | 44,928 |
Three years before current fiscal year | 31,695 |
Four years before current fiscal year | 22,757 |
Prior | 46,282 |
Revolving Loans Amortized Cost Basis | 46,588 |
Total Loans | 255,315 |
Real Estate [Member] | Agriculture [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 23,833 |
Fiscal year before current fiscal year | 21,355 |
Two years before current fiscal year | 20,788 |
Three years before current fiscal year | 16,052 |
Four years before current fiscal year | 9,606 |
Prior | 19,830 |
Revolving Loans Amortized Cost Basis | 39,081 |
Total Loans | 150,545 |
Real Estate [Member] | Agriculture [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 5,833 |
Fiscal year before current fiscal year | 8,951 |
Two years before current fiscal year | 1,119 |
Three years before current fiscal year | 1,076 |
Four years before current fiscal year | 2,589 |
Prior | 3,072 |
Revolving Loans Amortized Cost Basis | 1,686 |
Total Loans | 24,326 |
Real Estate [Member] | Agriculture [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 354 |
Fiscal year before current fiscal year | 886 |
Two years before current fiscal year | 612 |
Three years before current fiscal year | 51 |
Four years before current fiscal year | 5 |
Prior | 262 |
Revolving Loans Amortized Cost Basis | 4 |
Total Loans | 2,174 |
Commercial Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 158,385 |
Fiscal year before current fiscal year | 232,677 |
Two years before current fiscal year | 189,001 |
Three years before current fiscal year | 154,351 |
Four years before current fiscal year | 35,067 |
Prior | 65,587 |
Revolving Loans Amortized Cost Basis | 601,281 |
Total Loans | 1,436,349 | 1,289,452
Commercial Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 98,481 |
Fiscal year before current fiscal year | 135,724 |
Two years before current fiscal year | 155,712 |
Three years before current fiscal year | 132,447 |
Four years before current fiscal year | 28,731 |
Prior | 58,159 |
Revolving Loans Amortized Cost Basis | 421,728 |
Total Loans | 1,030,982 |
Commercial Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 57,646 |
Fiscal year before current fiscal year | 94,429 |
Two years before current fiscal year | 30,313 |
Three years before current fiscal year | 20,608 |
Four years before current fiscal year | 5,593 |
Prior | 6,885 |
Revolving Loans Amortized Cost Basis | 176,353 |
Total Loans | 391,827 |
Commercial Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,471 |
Fiscal year before current fiscal year | 2,160 |
Two years before current fiscal year | 2,183 |
Three years before current fiscal year | 1,035 |
Four years before current fiscal year | 235 |
Prior | 250 |
Revolving Loans Amortized Cost Basis | 2,637 |
Total Loans | 9,971 |
Commercial Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 787 |
Fiscal year before current fiscal year | 364 |
Two years before current fiscal year | 793 |
Three years before current fiscal year | 255 |
Four years before current fiscal year | 508 |
Prior | 116 |
Revolving Loans Amortized Cost Basis | 563 |
Total Loans | 3,386 |
Commercial Non-real Estate [Member] | Grade 5 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Three years before current fiscal year | 6 |
Prior | 177 |
Total Loans | 183 |
Consumer Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 116,415 |
Fiscal year before current fiscal year | 173,458 |
Two years before current fiscal year | 90,190 |
Three years before current fiscal year | 47,920 |
Four years before current fiscal year | 13,644 |
Prior | 8,218 |
Revolving Loans Amortized Cost Basis | 19,239 |
Total Loans | 469,084 | 476,467
Consumer Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 105,282 |
Fiscal year before current fiscal year | 153,775 |
Two years before current fiscal year | 77,329 |
Three years before current fiscal year | 40,937 |
Four years before current fiscal year | 11,724 |
Prior | 6,655 |
Revolving Loans Amortized Cost Basis | 12,793 |
Total Loans | 408,495 |
Consumer Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 9,876 |
Fiscal year before current fiscal year | 17,288 |
Two years before current fiscal year | 10,906 |
Three years before current fiscal year | 5,582 |
Four years before current fiscal year | 1,542 |
Prior | 1,219 |
Revolving Loans Amortized Cost Basis | 6,427 |
Total Loans | 52,840 |
Consumer Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,059 |
Fiscal year before current fiscal year | 1,839 |
Two years before current fiscal year | 1,641 |
Three years before current fiscal year | 1,119 |
Four years before current fiscal year | 274 |
Prior | 276 |
Revolving Loans Amortized Cost Basis | 15 |
Total Loans | 6,223 |
Consumer Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 198 |
Fiscal year before current fiscal year | 556 |
Two years before current fiscal year | 314 |
Three years before current fiscal year | 282 |
Four years before current fiscal year | 104 |
Prior | 68 |
Revolving Loans Amortized Cost Basis | 4 |
Total Loans | 1,526 |
Oil and Gas [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 137,278 |
Fiscal year before current fiscal year | 72,694 |
Two years before current fiscal year | 10,852 |
Three years before current fiscal year | 27,140 |
Four years before current fiscal year | 6,325 |
Prior | 3,823 |
Revolving Loans Amortized Cost Basis | 327,602 |
Total Loans | 585,714 | $ 586,654
Oil and Gas [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 76,512 |
Fiscal year before current fiscal year | 63,488 |
Two years before current fiscal year | 5,807 |
Three years before current fiscal year | 26,153 |
Four years before current fiscal year | 5,951 |
Prior | 3,116 |
Revolving Loans Amortized Cost Basis | 269,441 |
Total Loans | 450,468 |
Oil and Gas [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 60,737 |
Fiscal year before current fiscal year | 9,097 |
Two years before current fiscal year | 5,045 |
Three years before current fiscal year | 677 |
Four years before current fiscal year | 374 |
Prior | 267 |
Revolving Loans Amortized Cost Basis | 58,161 |
Total Loans | 134,358 |
Oil and Gas [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 29 |
Fiscal year before current fiscal year | 109 |
Three years before current fiscal year | 183 |
Four years before current fiscal year | 0 |
Total Loans | 321 |
Oil and Gas [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Three years before current fiscal year | 127 |
Prior | 440 |
Total Loans | $ 567 |

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