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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, 2024 | Dec. 31, 2023
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Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | $ 1,571,555 |
Fiscal year before current fiscal year | 1,563,086 |
Two years before current fiscal year | 1,481,000 |
Three years before current fiscal year | 917,997 |
Four years before current fiscal year | 478,564 |
Prior | 812,951 |
Revolving Loans Amortized Cost Basis | 1,355,208 |
Total Loans | 8,180,361 | $ 7,656,645
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 97,908 |
Fiscal year before current fiscal year | 145,325 |
Two years before current fiscal year | 201,569 |
Three years before current fiscal year | 155,082 |
Four years before current fiscal year | 99,653 |
Prior | 215,938 |
Revolving Loans Amortized Cost Basis | 24,045 |
Total Loans | 939,520 | 960,944
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 57,484 |
Fiscal year before current fiscal year | 100,209 |
Two years before current fiscal year | 148,898 |
Three years before current fiscal year | 102,563 |
Four years before current fiscal year | 77,151 |
Prior | 175,433 |
Revolving Loans Amortized Cost Basis | 18,792 |
Total Loans | 680,530 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 25,814 |
Fiscal year before current fiscal year | 37,446 |
Two years before current fiscal year | 48,964 |
Three years before current fiscal year | 47,874 |
Four years before current fiscal year | 21,235 |
Prior | 35,911 |
Revolving Loans Amortized Cost Basis | 4,971 |
Total Loans | 222,215 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 12,960 |
Fiscal year before current fiscal year | 7,293 |
Two years before current fiscal year | 3,687 |
Three years before current fiscal year | 4,596 |
Four years before current fiscal year | 915 |
Prior | 2,609 |
Revolving Loans Amortized Cost Basis | 160 |
Total Loans | 32,220 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,650 |
Fiscal year before current fiscal year | 377 |
Two years before current fiscal year | 20 |
Three years before current fiscal year | 49 |
Four years before current fiscal year | 352 |
Prior | 1,985 |
Revolving Loans Amortized Cost Basis | 122 |
Total Loans | 4,555 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 177,141 |
Fiscal year before current fiscal year | 376,972 |
Two years before current fiscal year | 424,019 |
Three years before current fiscal year | 270,684 |
Four years before current fiscal year | 149,132 |
Prior | 189,827 |
Revolving Loans Amortized Cost Basis | 44,697 |
Total Loans | 1,632,472 | 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 | 74,870 |
Fiscal year before current fiscal year | 271,096 |
Two years before current fiscal year | 280,887 |
Three years before current fiscal year | 187,555 |
Four years before current fiscal year | 119,241 |
Prior | 122,367 |
Revolving Loans Amortized Cost Basis | 40,695 |
Total Loans | 1,096,711 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 91,056 |
Fiscal year before current fiscal year | 105,735 |
Two years before current fiscal year | 129,516 |
Three years before current fiscal year | 81,139 |
Four years before current fiscal year | 29,760 |
Prior | 64,675 |
Revolving Loans Amortized Cost Basis | 4,002 |
Total Loans | 505,883 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 11,030 |
Two years before current fiscal year | 13,616 |
Three years before current fiscal year | 1,686 |
Four years before current fiscal year | 33 |
Prior | 243 |
Total Loans | 26,608 |
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 | 141 |
Two years before current fiscal year | 0 |
Three years before current fiscal year | 304 |
Four years before current fiscal year | 98 |
Prior | 2,542 |
Revolving Loans Amortized Cost Basis | 0 |
Total Loans | 3,270 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 158,231 |
Fiscal year before current fiscal year | 195,693 |
Two years before current fiscal year | 233,537 |
Three years before current fiscal year | 32,148 |
Four years before current fiscal year | 10,813 |
Prior | 21,971 |
Revolving Loans Amortized Cost Basis | 60,745 |
Total Loans | 713,138 | 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 | 74,367 |
Fiscal year before current fiscal year | 79,181 |
Two years before current fiscal year | 171,801 |
Three years before current fiscal year | 30,183 |
Four years before current fiscal year | 9,039 |
Prior | 7,416 |
Revolving Loans Amortized Cost Basis | 29,490 |
Total Loans | 401,477 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 79,077 |
Fiscal year before current fiscal year | 116,406 |
Two years before current fiscal year | 60,905 |
Three years before current fiscal year | 1,202 |
Four years before current fiscal year | 1,567 |
Prior | 14,489 |
Revolving Loans Amortized Cost Basis | 11,913 |
Total Loans | 285,559 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 4,736 |
Fiscal year before current fiscal year | 88 |
Three years before current fiscal year | 663 |
Four years before current fiscal year | 69 |
Prior | 66 |
Total Loans | 5,622 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 51 |
Fiscal year before current fiscal year | 18 |
Two years before current fiscal year | 831 |
Three years before current fiscal year | 100 |
Four years before current fiscal year | 138 |
Revolving Loans Amortized Cost Basis | 19,342 |
Total Loans | 20,480 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 176,803 |
Fiscal year before current fiscal year | 51,346 |
Two years before current fiscal year | 6,631 |
Three years before current fiscal year | 100 |
Four years before current fiscal year | 1,296 |
Prior | 532 |
Revolving Loans Amortized Cost Basis | 25,393 |
Total Loans | 262,101 | 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 | 104,772 |
Fiscal year before current fiscal year | 35,253 |
Two years before current fiscal year | 3,954 |
Three years before current fiscal year | 91 |
Four years before current fiscal year | 1,284 |
Prior | 532 |
Revolving Loans Amortized Cost Basis | 10,942 |
Total Loans | 156,828 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 66,604 |
Fiscal year before current fiscal year | 15,903 |
Two years before current fiscal year | 2,471 |
Three years before current fiscal year | 9 |
Four years before current fiscal year | 12 |
Prior | 0 |
Revolving Loans Amortized Cost Basis | 14,451 |
Total Loans | 99,450 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 4,916 |
Fiscal year before current fiscal year | 0 |
Two years before current fiscal year | 0 |
Three years before current fiscal year | 0 |
Prior | 0 |
Revolving Loans Amortized Cost Basis | 0 |
Total Loans | 4,916 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 511 |
Fiscal year before current fiscal year | 190 |
Two years before current fiscal year | 206 |
Total Loans | 907 |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 274,900 |
Fiscal year before current fiscal year | 295,099 |
Two years before current fiscal year | 261,267 |
Three years before current fiscal year | 197,396 |
Four years before current fiscal year | 129,212 |
Prior | 235,334 |
Revolving Loans Amortized Cost Basis | 1,955 |
Total Loans | 1,395,163 | 1,258,744
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 213,294 |
Fiscal year before current fiscal year | 220,298 |
Two years before current fiscal year | 208,733 |
Three years before current fiscal year | 157,011 |
Four years before current fiscal year | 101,934 |
Prior | 181,950 |
Revolving Loans Amortized Cost Basis | 986 |
Total Loans | 1,084,206 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 55,742 |
Fiscal year before current fiscal year | 70,183 |
Two years before current fiscal year | 49,081 |
Three years before current fiscal year | 35,708 |
Four years before current fiscal year | 24,668 |
Prior | 46,015 |
Revolving Loans Amortized Cost Basis | 969 |
Total Loans | 282,366 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 4,640 |
Fiscal year before current fiscal year | 3,918 |
Two years before current fiscal year | 3,005 |
Three years before current fiscal year | 2,897 |
Four years before current fiscal year | 2,157 |
Prior | 5,635 |
Total Loans | 22,252 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,224 |
Fiscal year before current fiscal year | 700 |
Two years before current fiscal year | 448 |
Three years before current fiscal year | 1,780 |
Four years before current fiscal year | 453 |
Prior | 1,734 |
Total Loans | 6,339 |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 37,539 |
Fiscal year before current fiscal year | 36,686 |
Two years before current fiscal year | 25,255 |
Three years before current fiscal year | 7,509 |
Four years before current fiscal year | 8,592 |
Prior | 15,678 |
Revolving Loans Amortized Cost Basis | 140,339 |
Total Loans | 271,598 | 244,696
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 31,285 |
Fiscal year before current fiscal year | 31,220 |
Two years before current fiscal year | 20,562 |
Three years before current fiscal year | 5,993 |
Four years before current fiscal year | 6,922 |
Prior | 11,298 |
Revolving Loans Amortized Cost Basis | 55,518 |
Total Loans | 162,798 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 5,421 |
Fiscal year before current fiscal year | 4,896 |
Two years before current fiscal year | 4,417 |
Three years before current fiscal year | 1,342 |
Four years before current fiscal year | 1,331 |
Prior | 3,762 |
Revolving Loans Amortized Cost Basis | 82,285 |
Total Loans | 103,454 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 571 |
Fiscal year before current fiscal year | 401 |
Two years before current fiscal year | 226 |
Three years before current fiscal year | 174 |
Four years before current fiscal year | 197 |
Prior | 594 |
Revolving Loans Amortized Cost Basis | 1,629 |
Total Loans | 3,792 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 262 |
Fiscal year before current fiscal year | 169 |
Two years before current fiscal year | 50 |
Three years before current fiscal year | 0 |
Four years before current fiscal year | 142 |
Prior | 24 |
Revolving Loans Amortized Cost Basis | 907 |
Total Loans | 1,554 |
Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 65,299 |
Fiscal year before current fiscal year | 73,789 |
Two years before current fiscal year | 63,886 |
Three years before current fiscal year | 46,022 |
Four years before current fiscal year | 33,574 |
Prior | 65,076 |
Revolving Loans Amortized Cost Basis | 80,366 |
Total Loans | 428,012 | 427,139
Real Estate [Member] | Agriculture [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 36,702 |
Fiscal year before current fiscal year | 45,768 |
Two years before current fiscal year | 41,775 |
Three years before current fiscal year | 29,706 |
Four years before current fiscal year | 21,769 |
Prior | 43,550 |
Revolving Loans Amortized Cost Basis | 42,446 |
Total Loans | 261,716 |
Real Estate [Member] | Agriculture [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 25,454 |
Fiscal year before current fiscal year | 19,370 |
Two years before current fiscal year | 19,784 |
Three years before current fiscal year | 14,665 |
Four years before current fiscal year | 9,183 |
Prior | 18,189 |
Revolving Loans Amortized Cost Basis | 35,079 |
Total Loans | 141,724 |
Real Estate [Member] | Agriculture [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 2,497 |
Fiscal year before current fiscal year | 8,160 |
Two years before current fiscal year | 1,503 |
Three years before current fiscal year | 1,481 |
Four years before current fiscal year | 2,548 |
Prior | 3,085 |
Revolving Loans Amortized Cost Basis | 2,744 |
Total Loans | 22,018 |
Real Estate [Member] | Agriculture [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 646 |
Fiscal year before current fiscal year | 491 |
Two years before current fiscal year | 824 |
Three years before current fiscal year | 170 |
Four years before current fiscal year | 74 |
Prior | 252 |
Revolving Loans Amortized Cost Basis | 97 |
Total Loans | 2,554 |
Commercial Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 223,998 |
Fiscal year before current fiscal year | 214,725 |
Two years before current fiscal year | 177,562 |
Three years before current fiscal year | 144,159 |
Four years before current fiscal year | 30,163 |
Prior | 59,449 |
Revolving Loans Amortized Cost Basis | 632,418 |
Total Loans | 1,482,474 | 1,289,452
Commercial Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 124,981 |
Fiscal year before current fiscal year | 127,161 |
Two years before current fiscal year | 142,229 |
Three years before current fiscal year | 122,786 |
Four years before current fiscal year | 24,896 |
Prior | 52,512 |
Revolving Loans Amortized Cost Basis | 426,523 |
Total Loans | 1,021,088 |
Commercial Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 96,479 |
Fiscal year before current fiscal year | 84,077 |
Two years before current fiscal year | 32,323 |
Three years before current fiscal year | 20,523 |
Four years before current fiscal year | 4,708 |
Prior | 6,396 |
Revolving Loans Amortized Cost Basis | 202,912 |
Total Loans | 447,418 |
Commercial Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,647 |
Fiscal year before current fiscal year | 3,005 |
Two years before current fiscal year | 2,292 |
Three years before current fiscal year | 599 |
Four years before current fiscal year | 126 |
Prior | 282 |
Revolving Loans Amortized Cost Basis | 2,438 |
Total Loans | 10,389 |
Commercial Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 891 |
Fiscal year before current fiscal year | 482 |
Two years before current fiscal year | 647 |
Three years before current fiscal year | 245 |
Four years before current fiscal year | 432 |
Prior | 89 |
Revolving Loans Amortized Cost Basis | 545 |
Total Loans | 3,331 |
Commercial Non-real Estate [Member] | Grade 5 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 0 |
Two years before current fiscal year | 71 |
Three years before current fiscal year | 6 |
Four years before current fiscal year | 1 |
Prior | 170 |
Total Loans | 248 |
Consumer Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 171,011 |
Fiscal year before current fiscal year | 149,348 |
Two years before current fiscal year | 77,329 |
Three years before current fiscal year | 40,219 |
Four years before current fiscal year | 10,796 |
Prior | 6,053 |
Revolving Loans Amortized Cost Basis | 21,719 |
Total Loans | 476,475 | 476,467
Consumer Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 154,137 |
Fiscal year before current fiscal year | 130,104 |
Two years before current fiscal year | 65,270 |
Three years before current fiscal year | 34,106 |
Four years before current fiscal year | 9,199 |
Prior | 4,752 |
Revolving Loans Amortized Cost Basis | 11,574 |
Total Loans | 409,142 |
Consumer Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 15,183 |
Fiscal year before current fiscal year | 16,368 |
Two years before current fiscal year | 10,112 |
Three years before current fiscal year | 4,926 |
Four years before current fiscal year | 1,227 |
Prior | 1,002 |
Revolving Loans Amortized Cost Basis | 10,128 |
Total Loans | 58,946 |
Consumer Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,460 |
Fiscal year before current fiscal year | 2,134 |
Two years before current fiscal year | 1,529 |
Three years before current fiscal year | 917 |
Four years before current fiscal year | 275 |
Prior | 241 |
Revolving Loans Amortized Cost Basis | 15 |
Total Loans | 6,571 |
Consumer Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 231 |
Fiscal year before current fiscal year | 720 |
Two years before current fiscal year | 418 |
Three years before current fiscal year | 270 |
Four years before current fiscal year | 95 |
Prior | 58 |
Revolving Loans Amortized Cost Basis | 2 |
Total Loans | 1,794 |
Consumer Non-real Estate [Member] | Grade 5 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 22 |
Prior | 0 |
Total Loans | 22 |
Oil and Gas [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 188,725 |
Fiscal year before current fiscal year | 24,103 |
Two years before current fiscal year | 9,945 |
Three years before current fiscal year | 24,678 |
Four years before current fiscal year | 5,333 |
Prior | 3,093 |
Revolving Loans Amortized Cost Basis | 323,531 |
Total Loans | 579,408 | $ 586,654
Oil and Gas [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 77,698 |
Fiscal year before current fiscal year | 15,998 |
Two years before current fiscal year | 5,293 |
Three years before current fiscal year | 23,811 |
Four years before current fiscal year | 4,967 |
Prior | 2,427 |
Revolving Loans Amortized Cost Basis | 232,703 |
Total Loans | 362,897 |
Oil and Gas [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 110,739 |
Fiscal year before current fiscal year | 7,652 |
Two years before current fiscal year | 4,652 |
Three years before current fiscal year | 584 |
Four years before current fiscal year | 366 |
Prior | 244 |
Revolving Loans Amortized Cost Basis | 90,353 |
Total Loans | 214,590 |
Oil and Gas [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 288 |
Fiscal year before current fiscal year | 453 |
Three years before current fiscal year | 173 |
Revolving Loans Amortized Cost Basis | 475 |
Total Loans | 1,389 |
Oil and Gas [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Three years before current fiscal year | 110 |
Prior | 422 |
Total Loans | $ 532 |

X
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