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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, 2024 | Dec. 31, 2023
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Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | $ 575,035 |
Fiscal year before current fiscal year | 1,935,478 |
Two years before current fiscal year | 1,525,653 |
Three years before current fiscal year | 1,050,103 |
Four years before current fiscal year | 528,174 |
Prior | 935,167 |
Revolving Loans Amortized Cost Basis | 1,232,250 |
Total Loans | 7,781,860 | $ 7,656,645
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 35,372 |
Fiscal year before current fiscal year | 151,687 |
Two years before current fiscal year | 209,226 |
Three years before current fiscal year | 166,981 |
Four years before current fiscal year | 105,630 |
Prior | 249,178 |
Revolving Loans Amortized Cost Basis | 44,129 |
Total Loans | 962,203 | 960,944
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 25,173 |
Fiscal year before current fiscal year | 109,028 |
Two years before current fiscal year | 159,208 |
Three years before current fiscal year | 116,637 |
Four years before current fiscal year | 82,223 |
Prior | 203,263 |
Revolving Loans Amortized Cost Basis | 18,941 |
Total Loans | 714,473 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 6,168 |
Fiscal year before current fiscal year | 34,656 |
Two years before current fiscal year | 46,355 |
Three years before current fiscal year | 44,871 |
Four years before current fiscal year | 22,165 |
Prior | 40,867 |
Revolving Loans Amortized Cost Basis | 22,938 |
Total Loans | 218,020 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 4,031 |
Fiscal year before current fiscal year | 7,629 |
Two years before current fiscal year | 3,640 |
Three years before current fiscal year | 5,303 |
Four years before current fiscal year | 890 |
Prior | 3,055 |
Revolving Loans Amortized Cost Basis | 2,100 |
Total Loans | 26,648 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 374 |
Two years before current fiscal year | 23 |
Three years before current fiscal year | 170 |
Four years before current fiscal year | 352 |
Prior | 1,654 |
Revolving Loans Amortized Cost Basis | 150 |
Total Loans | 2,723 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 5 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Prior | 339 |
Total Loans | 339 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 49,644 |
Fiscal year before current fiscal year | 383,359 |
Two years before current fiscal year | 411,814 |
Three years before current fiscal year | 275,294 |
Four years before current fiscal year | 161,886 |
Prior | 213,923 |
Revolving Loans Amortized Cost Basis | 35,265 |
Total Loans | 1,531,185 | 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 | 30,431 |
Fiscal year before current fiscal year | 217,786 |
Two years before current fiscal year | 266,193 |
Three years before current fiscal year | 187,861 |
Four years before current fiscal year | 116,004 |
Prior | 120,132 |
Revolving Loans Amortized Cost Basis | 32,534 |
Total Loans | 970,941 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 13,104 |
Fiscal year before current fiscal year | 163,293 |
Two years before current fiscal year | 144,208 |
Three years before current fiscal year | 85,378 |
Four years before current fiscal year | 45,784 |
Prior | 93,020 |
Revolving Loans Amortized Cost Basis | 2,731 |
Total Loans | 547,518 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 6,109 |
Two years before current fiscal year | 781 |
Three years before current fiscal year | 1,703 |
Prior | 247 |
Total Loans | 8,840 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 2,280 |
Two years before current fiscal year | 632 |
Three years before current fiscal year | 352 |
Four years before current fiscal year | 98 |
Prior | 524 |
Total Loans | 3,886 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 53,814 |
Fiscal year before current fiscal year | 222,170 |
Two years before current fiscal year | 211,581 |
Three years before current fiscal year | 76,514 |
Four years before current fiscal year | 12,025 |
Prior | 23,220 |
Revolving Loans Amortized Cost Basis | 70,402 |
Total Loans | 669,726 | 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 | 29,037 |
Fiscal year before current fiscal year | 89,815 |
Two years before current fiscal year | 147,644 |
Three years before current fiscal year | 50,050 |
Four years before current fiscal year | 5,324 |
Prior | 7,984 |
Revolving Loans Amortized Cost Basis | 42,282 |
Total Loans | 372,136 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 24,777 |
Fiscal year before current fiscal year | 126,003 |
Two years before current fiscal year | 62,244 |
Three years before current fiscal year | 26,007 |
Four years before current fiscal year | 6,561 |
Prior | 15,166 |
Revolving Loans Amortized Cost Basis | 8,778 |
Total Loans | 269,536 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 6,352 |
Two years before current fiscal year | 893 |
Three years before current fiscal year | 357 |
Prior | 70 |
Revolving Loans Amortized Cost Basis | 19,342 |
Total Loans | 27,014 |
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 | 800 |
Three years before current fiscal year | 100 |
Four years before current fiscal year | 140 |
Total Loans | 1,040 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 63,670 |
Fiscal year before current fiscal year | 151,384 |
Two years before current fiscal year | 16,966 |
Three years before current fiscal year | 8,641 |
Four years before current fiscal year | 111 |
Prior | 559 |
Revolving Loans Amortized Cost Basis | 39,355 |
Total Loans | 280,686 | 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 | 34,249 |
Fiscal year before current fiscal year | 84,861 |
Two years before current fiscal year | 14,251 |
Three years before current fiscal year | 8,620 |
Four years before current fiscal year | 99 |
Prior | 559 |
Revolving Loans Amortized Cost Basis | 38,050 |
Total Loans | 180,689 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 28,843 |
Fiscal year before current fiscal year | 58,132 |
Two years before current fiscal year | 2,135 |
Three years before current fiscal year | 21 |
Four years before current fiscal year | 12 |
Prior | 0 |
Revolving Loans Amortized Cost Basis | 1,305 |
Total Loans | 90,448 |
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 | 8,191 |
Two years before current fiscal year | 374 |
Total Loans | 8,565 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 578 |
Fiscal year before current fiscal year | 200 |
Two years before current fiscal year | 206 |
Total Loans | 984 |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 87,310 |
Fiscal year before current fiscal year | 321,804 |
Two years before current fiscal year | 259,974 |
Three years before current fiscal year | 208,482 |
Four years before current fiscal year | 138,001 |
Prior | 263,671 |
Revolving Loans Amortized Cost Basis | 4,637 |
Total Loans | 1,283,879 | 1,258,744
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 72,174 |
Fiscal year before current fiscal year | 268,280 |
Two years before current fiscal year | 214,401 |
Three years before current fiscal year | 167,456 |
Four years before current fiscal year | 110,847 |
Prior | 204,350 |
Revolving Loans Amortized Cost Basis | 4,637 |
Total Loans | 1,042,145 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 14,813 |
Fiscal year before current fiscal year | 49,624 |
Two years before current fiscal year | 42,664 |
Three years before current fiscal year | 37,763 |
Four years before current fiscal year | 24,732 |
Prior | 51,823 |
Total Loans | 221,419 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 232 |
Fiscal year before current fiscal year | 2,987 |
Two years before current fiscal year | 2,691 |
Three years before current fiscal year | 2,538 |
Four years before current fiscal year | 1,710 |
Prior | 5,622 |
Total Loans | 15,780 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 91 |
Fiscal year before current fiscal year | 913 |
Two years before current fiscal year | 218 |
Three years before current fiscal year | 725 |
Four years before current fiscal year | 712 |
Prior | 1,876 |
Total Loans | 4,535 |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 10,395 |
Fiscal year before current fiscal year | 41,757 |
Two years before current fiscal year | 27,040 |
Three years before current fiscal year | 8,522 |
Four years before current fiscal year | 9,346 |
Prior | 18,776 |
Revolving Loans Amortized Cost Basis | 136,799 |
Total Loans | 252,635 | 244,696
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 8,258 |
Fiscal year before current fiscal year | 36,264 |
Two years before current fiscal year | 21,550 |
Three years before current fiscal year | 6,892 |
Four years before current fiscal year | 7,585 |
Prior | 14,383 |
Revolving Loans Amortized Cost Basis | 55,776 |
Total Loans | 150,708 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,682 |
Fiscal year before current fiscal year | 5,082 |
Two years before current fiscal year | 5,290 |
Three years before current fiscal year | 1,434 |
Four years before current fiscal year | 1,595 |
Prior | 3,611 |
Revolving Loans Amortized Cost Basis | 78,539 |
Total Loans | 97,233 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 455 |
Fiscal year before current fiscal year | 292 |
Two years before current fiscal year | 176 |
Three years before current fiscal year | 196 |
Four years before current fiscal year | 166 |
Prior | 671 |
Revolving Loans Amortized Cost Basis | 1,590 |
Total Loans | 3,546 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 119 |
Two years before current fiscal year | 24 |
Three years before current fiscal year | 0 |
Prior | 111 |
Revolving Loans Amortized Cost Basis | 894 |
Total Loans | 1,148 |
Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 26,903 |
Fiscal year before current fiscal year | 92,297 |
Two years before current fiscal year | 69,896 |
Three years before current fiscal year | 51,907 |
Four years before current fiscal year | 37,329 |
Prior | 72,380 |
Revolving Loans Amortized Cost Basis | 99,100 |
Total Loans | 449,812 | 427,139
Real Estate [Member] | Agriculture [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 13,547 |
Fiscal year before current fiscal year | 57,413 |
Two years before current fiscal year | 47,429 |
Three years before current fiscal year | 33,676 |
Four years before current fiscal year | 25,336 |
Prior | 48,773 |
Revolving Loans Amortized Cost Basis | 49,003 |
Total Loans | 275,177 |
Real Estate [Member] | Agriculture [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 11,754 |
Fiscal year before current fiscal year | 25,588 |
Two years before current fiscal year | 21,021 |
Three years before current fiscal year | 17,212 |
Four years before current fiscal year | 9,303 |
Prior | 20,012 |
Revolving Loans Amortized Cost Basis | 48,165 |
Total Loans | 153,055 |
Real Estate [Member] | Agriculture [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,602 |
Fiscal year before current fiscal year | 8,528 |
Two years before current fiscal year | 819 |
Three years before current fiscal year | 966 |
Four years before current fiscal year | 2,591 |
Prior | 3,328 |
Revolving Loans Amortized Cost Basis | 1,931 |
Total Loans | 19,765 |
Real Estate [Member] | Agriculture [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 768 |
Two years before current fiscal year | 627 |
Three years before current fiscal year | 53 |
Four years before current fiscal year | 99 |
Prior | 267 |
Revolving Loans Amortized Cost Basis | 1 |
Total Loans | 1,815 |
Commercial Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 63,861 |
Fiscal year before current fiscal year | 285,964 |
Two years before current fiscal year | 200,777 |
Three years before current fiscal year | 167,663 |
Four years before current fiscal year | 40,006 |
Prior | 78,348 |
Revolving Loans Amortized Cost Basis | 484,221 |
Total Loans | 1,320,840 | 1,289,452
Commercial Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 38,088 |
Fiscal year before current fiscal year | 177,037 |
Two years before current fiscal year | 163,957 |
Three years before current fiscal year | 148,673 |
Four years before current fiscal year | 32,770 |
Prior | 64,198 |
Revolving Loans Amortized Cost Basis | 317,586 |
Total Loans | 942,309 |
Commercial Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 24,463 |
Fiscal year before current fiscal year | 106,857 |
Two years before current fiscal year | 33,066 |
Three years before current fiscal year | 17,747 |
Four years before current fiscal year | 6,480 |
Prior | 13,144 |
Revolving Loans Amortized Cost Basis | 161,984 |
Total Loans | 363,741 |
Commercial Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,184 |
Fiscal year before current fiscal year | 1,930 |
Two years before current fiscal year | 2,260 |
Three years before current fiscal year | 1,015 |
Four years before current fiscal year | 283 |
Prior | 196 |
Revolving Loans Amortized Cost Basis | 3,411 |
Total Loans | 10,279 |
Commercial Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 126 |
Fiscal year before current fiscal year | 122 |
Two years before current fiscal year | 1,494 |
Three years before current fiscal year | 228 |
Four years before current fiscal year | 473 |
Prior | 360 |
Revolving Loans Amortized Cost Basis | 1,240 |
Total Loans | 4,043 |
Commercial Non-real Estate [Member] | Grade 5 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 18 |
Four years before current fiscal year | 0 |
Prior | 450 |
Total Loans | 468 |
Consumer Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 57,750 |
Fiscal year before current fiscal year | 201,299 |
Two years before current fiscal year | 106,895 |
Three years before current fiscal year | 56,898 |
Four years before current fiscal year | 17,282 |
Prior | 11,089 |
Revolving Loans Amortized Cost Basis | 13,953 |
Total Loans | 465,166 | 476,467
Consumer Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 52,889 |
Fiscal year before current fiscal year | 180,937 |
Two years before current fiscal year | 90,786 |
Three years before current fiscal year | 49,021 |
Four years before current fiscal year | 14,926 |
Prior | 9,321 |
Revolving Loans Amortized Cost Basis | 11,638 |
Total Loans | 409,518 |
Consumer Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 4,202 |
Fiscal year before current fiscal year | 18,228 |
Two years before current fiscal year | 14,005 |
Three years before current fiscal year | 6,266 |
Four years before current fiscal year | 1,906 |
Prior | 1,323 |
Revolving Loans Amortized Cost Basis | 2,299 |
Total Loans | 48,229 |
Consumer Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 565 |
Fiscal year before current fiscal year | 1,714 |
Two years before current fiscal year | 1,493 |
Three years before current fiscal year | 1,221 |
Four years before current fiscal year | 295 |
Prior | 360 |
Revolving Loans Amortized Cost Basis | 10 |
Total Loans | 5,658 |
Consumer Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 94 |
Fiscal year before current fiscal year | 420 |
Two years before current fiscal year | 611 |
Three years before current fiscal year | 390 |
Four years before current fiscal year | 155 |
Prior | 85 |
Revolving Loans Amortized Cost Basis | 6 |
Total Loans | 1,761 |
Oil and Gas [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 126,316 |
Fiscal year before current fiscal year | 83,757 |
Two years before current fiscal year | 11,484 |
Three years before current fiscal year | 29,201 |
Four years before current fiscal year | 6,558 |
Prior | 4,023 |
Revolving Loans Amortized Cost Basis | 304,389 |
Total Loans | 565,728 | $ 586,654
Oil and Gas [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 70,735 |
Fiscal year before current fiscal year | 71,998 |
Two years before current fiscal year | 6,206 |
Three years before current fiscal year | 28,039 |
Four years before current fiscal year | 6,172 |
Prior | 3,205 |
Revolving Loans Amortized Cost Basis | 252,952 |
Total Loans | 439,307 |
Oil and Gas [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 55,581 |
Fiscal year before current fiscal year | 11,759 |
Two years before current fiscal year | 5,278 |
Three years before current fiscal year | 829 |
Four years before current fiscal year | 386 |
Prior | 358 |
Revolving Loans Amortized Cost Basis | 51,437 |
Total Loans | 125,628 |
Oil and Gas [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Three years before current fiscal year | 185 |
Total Loans | 185 |
Oil and Gas [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Three years before current fiscal year | 148 |
Prior | 460 |
Total Loans | $ 608 |

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