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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, 2022 | Dec. 31, 2021
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Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | $ 666,235 |
Fiscal year before current fiscal year | 2,008,089 |
Two years before current fiscal year | 997,214 |
Three years before current fiscal year | 702,350 |
Four years before current fiscal year | 365,300 |
Prior | 785,344 |
Revolving Loans Amortized Cost Basis | 969,808 |
Total Loans | 6,494,340 | $ 6,169,442
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 92,958 |
Fiscal year before current fiscal year | 169,445 |
Two years before current fiscal year | 149,681 |
Three years before current fiscal year | 119,055 |
Four years before current fiscal year | 60,441 |
Prior | 157,001 |
Revolving Loans Amortized Cost Basis | 36,038 |
Total Loans | 784,619 | 684,739
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 53,454 |
Fiscal year before current fiscal year | 130,071 |
Two years before current fiscal year | 115,334 |
Three years before current fiscal year | 94,782 |
Four years before current fiscal year | 49,997 |
Prior | 120,371 |
Revolving Loans Amortized Cost Basis | 24,862 |
Total Loans | 588,871 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 39,504 |
Fiscal year before current fiscal year | 39,029 |
Two years before current fiscal year | 33,297 |
Three years before current fiscal year | 22,802 |
Four years before current fiscal year | 9,986 |
Prior | 35,244 |
Revolving Loans Amortized Cost Basis | 10,657 |
Total Loans | 190,519 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 42 |
Two years before current fiscal year | 459 |
Three years before current fiscal year | 601 |
Four years before current fiscal year | 258 |
Prior | 541 |
Revolving Loans Amortized Cost Basis | 212 |
Total Loans | 2,113 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 303 |
Two years before current fiscal year | 591 |
Three years before current fiscal year | 870 |
Four years before current fiscal year | 200 |
Prior | 845 |
Revolving Loans Amortized Cost Basis | 307 |
Total Loans | 3,116 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 53,455 |
Fiscal year before current fiscal year | 311,216 |
Two years before current fiscal year | 255,241 |
Three years before current fiscal year | 170,159 |
Four years before current fiscal year | 94,124 |
Prior | 209,746 |
Revolving Loans Amortized Cost Basis | 66,565 |
Total Loans | 1,160,506 | 1,095,324
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 27,931 |
Fiscal year before current fiscal year | 258,527 |
Two years before current fiscal year | 208,346 |
Three years before current fiscal year | 116,081 |
Four years before current fiscal year | 51,072 |
Prior | 118,840 |
Revolving Loans Amortized Cost Basis | 37,306 |
Total Loans | 818,103 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 18,461 |
Fiscal year before current fiscal year | 52,282 |
Two years before current fiscal year | 46,895 |
Three years before current fiscal year | 50,872 |
Four years before current fiscal year | 42,738 |
Prior | 88,046 |
Revolving Loans Amortized Cost Basis | 29,259 |
Total Loans | 328,553 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 7,063 |
Three years before current fiscal year | 3,206 |
Four years before current fiscal year | 107 |
Prior | 2,828 |
Total Loans | 13,204 |
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 | 407 |
Four years before current fiscal year | 207 |
Prior | 32 |
Total Loans | 646 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 68,612 |
Fiscal year before current fiscal year | 197,654 |
Two years before current fiscal year | 43,889 |
Three years before current fiscal year | 55,198 |
Four years before current fiscal year | 5,544 |
Prior | 7,903 |
Revolving Loans Amortized Cost Basis | 80,059 |
Total Loans | 458,859 | 415,466
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 53,028 |
Fiscal year before current fiscal year | 162,575 |
Two years before current fiscal year | 39,428 |
Three years before current fiscal year | 42,116 |
Four years before current fiscal year | 3,719 |
Prior | 6,572 |
Revolving Loans Amortized Cost Basis | 35,506 |
Total Loans | 342,944 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 14,386 |
Fiscal year before current fiscal year | 32,079 |
Two years before current fiscal year | 4,323 |
Three years before current fiscal year | 13,028 |
Four years before current fiscal year | 1,825 |
Prior | 1,314 |
Revolving Loans Amortized Cost Basis | 44,553 |
Total Loans | 111,508 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,198 |
Fiscal year before current fiscal year | 3,000 |
Two years before current fiscal year | 105 |
Total Loans | 4,303 |
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 | 33 |
Three years before current fiscal year | 54 |
Prior | 17 |
Total Loans | 104 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 63,356 |
Fiscal year before current fiscal year | 182,947 |
Two years before current fiscal year | 4,995 |
Three years before current fiscal year | 33 |
Prior | 465 |
Revolving Loans Amortized Cost Basis | 30,231 |
Total Loans | 282,027 | 254,524
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 54,418 |
Fiscal year before current fiscal year | 159,373 |
Two years before current fiscal year | 4,522 |
Three years before current fiscal year | 33 |
Prior | 46 |
Revolving Loans Amortized Cost Basis | 26,274 |
Total Loans | 244,666 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 8,528 |
Fiscal year before current fiscal year | 23,471 |
Two years before current fiscal year | 473 |
Prior | 419 |
Revolving Loans Amortized Cost Basis | 3,957 |
Total Loans | 36,848 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 410 |
Fiscal year before current fiscal year | 103 |
Total Loans | 513 |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 95,638 |
Fiscal year before current fiscal year | 298,179 |
Two years before current fiscal year | 201,983 |
Three years before current fiscal year | 120,142 |
Four years before current fiscal year | 81,493 |
Prior | 227,402 |
Revolving Loans Amortized Cost Basis | 7,895 |
Total Loans | 1,032,732 | 937,006
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 82,439 |
Fiscal year before current fiscal year | 255,075 |
Two years before current fiscal year | 172,583 |
Three years before current fiscal year | 102,582 |
Four years before current fiscal year | 65,952 |
Prior | 174,331 |
Revolving Loans Amortized Cost Basis | 7,895 |
Total Loans | 860,857 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 11,906 |
Fiscal year before current fiscal year | 41,467 |
Two years before current fiscal year | 28,275 |
Three years before current fiscal year | 15,303 |
Four years before current fiscal year | 12,622 |
Prior | 46,039 |
Total Loans | 155,612 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,293 |
Fiscal year before current fiscal year | 1,506 |
Two years before current fiscal year | 886 |
Three years before current fiscal year | 1,839 |
Four years before current fiscal year | 1,936 |
Prior | 4,688 |
Total Loans | 12,148 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 131 |
Two years before current fiscal year | 239 |
Three years before current fiscal year | 418 |
Four years before current fiscal year | 983 |
Prior | 2,344 |
Total Loans | 4,115 |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 6,330 |
Fiscal year before current fiscal year | 18,319 |
Two years before current fiscal year | 15,922 |
Three years before current fiscal year | 9,648 |
Four years before current fiscal year | 6,738 |
Prior | 18,679 |
Revolving Loans Amortized Cost Basis | 85,207 |
Total Loans | 160,843 | 161,018
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 5,357 |
Fiscal year before current fiscal year | 15,974 |
Two years before current fiscal year | 13,307 |
Three years before current fiscal year | 7,665 |
Four years before current fiscal year | 4,976 |
Prior | 14,588 |
Revolving Loans Amortized Cost Basis | 31,325 |
Total Loans | 93,192 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 933 |
Fiscal year before current fiscal year | 2,028 |
Two years before current fiscal year | 2,342 |
Three years before current fiscal year | 1,895 |
Four years before current fiscal year | 1,470 |
Prior | 3,044 |
Revolving Loans Amortized Cost Basis | 52,937 |
Total Loans | 64,649 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 40 |
Fiscal year before current fiscal year | 304 |
Two years before current fiscal year | 95 |
Three years before current fiscal year | 88 |
Four years before current fiscal year | 254 |
Prior | 946 |
Revolving Loans Amortized Cost Basis | 559 |
Total Loans | 2,286 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 13 |
Two years before current fiscal year | 178 |
Four years before current fiscal year | 38 |
Prior | 101 |
Revolving Loans Amortized Cost Basis | 386 |
Total Loans | 716 |
Real Estate [Member] | Farmland [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 21,425 |
Fiscal year before current fiscal year | 64,860 |
Two years before current fiscal year | 46,014 |
Three years before current fiscal year | 47,473 |
Four years before current fiscal year | 19,712 |
Prior | 56,004 |
Revolving Loans Amortized Cost Basis | 20,977 |
Total Loans | 276,465 | 272,179
Real Estate [Member] | Farmland [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 15,574 |
Fiscal year before current fiscal year | 44,160 |
Two years before current fiscal year | 35,899 |
Three years before current fiscal year | 23,593 |
Four years before current fiscal year | 12,282 |
Prior | 36,405 |
Revolving Loans Amortized Cost Basis | 5,763 |
Total Loans | 173,676 |
Real Estate [Member] | Farmland [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 4,505 |
Fiscal year before current fiscal year | 16,679 |
Two years before current fiscal year | 7,874 |
Three years before current fiscal year | 22,007 |
Four years before current fiscal year | 6,381 |
Prior | 16,671 |
Revolving Loans Amortized Cost Basis | 13,102 |
Total Loans | 87,219 |
Real Estate [Member] | Farmland [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,346 |
Fiscal year before current fiscal year | 2,896 |
Two years before current fiscal year | 1,862 |
Three years before current fiscal year | 1,873 |
Four years before current fiscal year | 70 |
Prior | 2,704 |
Revolving Loans Amortized Cost Basis | 1,880 |
Total Loans | 12,631 |
Real Estate [Member] | Farmland [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 1,125 |
Two years before current fiscal year | 379 |
Four years before current fiscal year | 979 |
Prior | 224 |
Revolving Loans Amortized Cost Basis | 232 |
Total Loans | 2,939 |
Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 97,428 |
Fiscal year before current fiscal year | 375,136 |
Two years before current fiscal year | 126,312 |
Three years before current fiscal year | 98,264 |
Four years before current fiscal year | 50,978 |
Prior | 81,881 |
Revolving Loans Amortized Cost Basis | 461,628 |
Total Loans | 1,291,627 | 1,256,487
Commercial and Agricultural Non-Real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 77,553 |
Fiscal year before current fiscal year | 296,814 |
Two years before current fiscal year | 93,424 |
Three years before current fiscal year | 75,665 |
Four years before current fiscal year | 20,679 |
Prior | 67,573 |
Revolving Loans Amortized Cost Basis | 315,085 |
Total Loans | 946,793 |
Commercial and Agricultural Non-Real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 17,955 |
Fiscal year before current fiscal year | 75,007 |
Two years before current fiscal year | 30,905 |
Three years before current fiscal year | 20,516 |
Four years before current fiscal year | 27,531 |
Prior | 12,032 |
Revolving Loans Amortized Cost Basis | 138,823 |
Total Loans | 322,769 |
Commercial and Agricultural Non-Real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,562 |
Fiscal year before current fiscal year | 2,516 |
Two years before current fiscal year | 1,717 |
Three years before current fiscal year | 1,136 |
Four years before current fiscal year | 2,259 |
Prior | 1,105 |
Revolving Loans Amortized Cost Basis | 7,479 |
Total Loans | 17,774 |
Commercial and Agricultural Non-Real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 358 |
Fiscal year before current fiscal year | 799 |
Two years before current fiscal year | 266 |
Three years before current fiscal year | 947 |
Four years before current fiscal year | 509 |
Prior | 1,171 |
Revolving Loans Amortized Cost Basis | 241 |
Total Loans | 4,291 |
Consumer Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 62,177 |
Fiscal year before current fiscal year | 192,821 |
Two years before current fiscal year | 74,228 |
Three years before current fiscal year | 42,379 |
Four years before current fiscal year | 16,017 |
Prior | 8,152 |
Revolving Loans Amortized Cost Basis | 23,716 |
Total Loans | 419,490 | 413,370
Consumer Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 55,988 |
Fiscal year before current fiscal year | 175,287 |
Two years before current fiscal year | 67,276 |
Three years before current fiscal year | 36,818 |
Four years before current fiscal year | 13,972 |
Prior | 5,867 |
Revolving Loans Amortized Cost Basis | 21,964 |
Total Loans | 377,172 |
Consumer Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 6,002 |
Fiscal year before current fiscal year | 16,755 |
Two years before current fiscal year | 6,569 |
Three years before current fiscal year | 4,973 |
Four years before current fiscal year | 1,806 |
Prior | 2,179 |
Revolving Loans Amortized Cost Basis | 1,749 |
Total Loans | 40,033 |
Consumer Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 136 |
Fiscal year before current fiscal year | 636 |
Two years before current fiscal year | 299 |
Three years before current fiscal year | 364 |
Four years before current fiscal year | 129 |
Prior | 103 |
Revolving Loans Amortized Cost Basis | 3 |
Total Loans | 1,670 |
Consumer Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 51 |
Fiscal year before current fiscal year | 143 |
Two years before current fiscal year | 84 |
Three years before current fiscal year | 224 |
Four years before current fiscal year | 110 |
Prior | 3 |
Total Loans | 615 |
Oil and Gas [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 99,198 |
Fiscal year before current fiscal year | 136,667 |
Two years before current fiscal year | 40,835 |
Three years before current fiscal year | 13,732 |
Four years before current fiscal year | 11,093 |
Prior | 615 |
Revolving Loans Amortized Cost Basis | 125,652 |
Total Loans | 427,792 | 428,908
Oil and Gas [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 91,575 |
Fiscal year before current fiscal year | 122,401 |
Two years before current fiscal year | 32,400 |
Three years before current fiscal year | 8,174 |
Four years before current fiscal year | 1,174 |
Prior | 110 |
Revolving Loans Amortized Cost Basis | 93,578 |
Total Loans | 349,412 |
Oil and Gas [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 7,623 |
Fiscal year before current fiscal year | 8,352 |
Two years before current fiscal year | 8,426 |
Three years before current fiscal year | 5,558 |
Four years before current fiscal year | 9,919 |
Prior | 278 |
Revolving Loans Amortized Cost Basis | 30,820 |
Total Loans | 70,976 |
Oil and Gas [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 4,914 |
Two years before current fiscal year | 9 |
Prior | 227 |
Revolving Loans Amortized Cost Basis | 1,185 |
Total Loans | 6,335 |
Oil and Gas [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 1,000 |
Revolving Loans Amortized Cost Basis | 69 |
Total Loans | 1,069 |
Other Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 5,658 |
Fiscal year before current fiscal year | 60,845 |
Two years before current fiscal year | 38,114 |
Three years before current fiscal year | 26,267 |
Four years before current fiscal year | 19,160 |
Prior | 17,496 |
Revolving Loans Amortized Cost Basis | 31,840 |
Total Loans | 199,380 | $ 250,421
Other Loans [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 5,658 |
Fiscal year before current fiscal year | 60,549 |
Two years before current fiscal year | 38,097 |
Three years before current fiscal year | 26,158 |
Four years before current fiscal year | 18,786 |
Prior | 14,429 |
Revolving Loans Amortized Cost Basis | 30,235 |
Total Loans | 193,912 |
Other Loans [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 296 |
Four years before current fiscal year | 65 |
Prior | 2,933 |
Revolving Loans Amortized Cost Basis | 471 |
Total Loans | 3,765 |
Other Loans [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Four years before current fiscal year | 140 |
Prior | 82 |
Revolving Loans Amortized Cost Basis | 1,052 |
Total Loans | 1,274 |
Other Loans [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Two years before current fiscal year | 17 |
Three years before current fiscal year | 109 |
Four years before current fiscal year | 169 |
Prior | 52 |
Revolving Loans Amortized Cost Basis | 82 |
Total Loans | $ 429 |

X
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