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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, 2022 | Dec. 31, 2021
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Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | $ 1,217,401 |
Fiscal year before current fiscal year | 1,718,960 |
Two years before current fiscal year | 892,016 |
Three years before current fiscal year | 640,007 |
Four years before current fiscal year | 320,149 |
Prior | 740,053 |
Revolving Loans Amortized Cost Basis | 1,084,697 |
Total Loans | 6,613,283 | $ 6,169,442
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 124,611 |
Fiscal year before current fiscal year | 188,215 |
Two years before current fiscal year | 152,400 |
Three years before current fiscal year | 122,011 |
Four years before current fiscal year | 60,524 |
Prior | 173,838 |
Revolving Loans Amortized Cost Basis | 71,545 |
Total Loans | 893,144 | 775,554
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 98,837 |
Fiscal year before current fiscal year | 153,898 |
Two years before current fiscal year | 119,189 |
Three years before current fiscal year | 98,981 |
Four years before current fiscal year | 49,907 |
Prior | 138,353 |
Revolving Loans Amortized Cost Basis | 47,977 |
Total Loans | 707,142 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 25,774 |
Fiscal year before current fiscal year | 33,972 |
Two years before current fiscal year | 32,759 |
Three years before current fiscal year | 21,243 |
Four years before current fiscal year | 10,083 |
Prior | 33,359 |
Revolving Loans Amortized Cost Basis | 23,049 |
Total Loans | 180,239 |
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 | 452 |
Three years before current fiscal year | 936 |
Four years before current fiscal year | 341 |
Prior | 1,606 |
Revolving Loans Amortized Cost Basis | 212 |
Total Loans | 3,589 |
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 |
Three years before current fiscal year | 851 |
Four years before current fiscal year | 193 |
Prior | 520 |
Revolving Loans Amortized Cost Basis | 307 |
Total Loans | 2,174 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 151,869 |
Fiscal year before current fiscal year | 293,249 |
Two years before current fiscal year | 229,779 |
Three years before current fiscal year | 165,134 |
Four years before current fiscal year | 71,456 |
Prior | 193,346 |
Revolving Loans Amortized Cost Basis | 58,079 |
Total Loans | 1,162,912 | 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 | 86,546 |
Fiscal year before current fiscal year | 238,973 |
Two years before current fiscal year | 183,794 |
Three years before current fiscal year | 112,077 |
Four years before current fiscal year | 38,979 |
Prior | 104,280 |
Revolving Loans Amortized Cost Basis | 28,735 |
Total Loans | 793,384 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 58,327 |
Fiscal year before current fiscal year | 54,276 |
Two years before current fiscal year | 45,985 |
Three years before current fiscal year | 49,899 |
Four years before current fiscal year | 32,181 |
Prior | 86,252 |
Revolving Loans Amortized Cost Basis | 29,344 |
Total Loans | 356,264 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 6,996 |
Three years before current fiscal year | 3,158 |
Four years before current fiscal year | 93 |
Prior | 2,814 |
Total Loans | 13,061 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Four years before current fiscal year | 203 |
Total Loans | 203 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 79,463 |
Fiscal year before current fiscal year | 164,309 |
Two years before current fiscal year | 44,049 |
Three years before current fiscal year | 52,701 |
Four years before current fiscal year | 5,362 |
Prior | 7,181 |
Revolving Loans Amortized Cost Basis | 83,593 |
Total Loans | 436,658 | 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 | 60,042 |
Fiscal year before current fiscal year | 136,104 |
Two years before current fiscal year | 42,114 |
Three years before current fiscal year | 37,833 |
Four years before current fiscal year | 3,629 |
Prior | 5,887 |
Revolving Loans Amortized Cost Basis | 40,046 |
Total Loans | 325,655 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 18,223 |
Fiscal year before current fiscal year | 28,205 |
Two years before current fiscal year | 1,799 |
Three years before current fiscal year | 14,816 |
Four years before current fiscal year | 1,733 |
Prior | 1,277 |
Revolving Loans Amortized Cost Basis | 43,436 |
Total Loans | 109,489 |
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 |
Two years before current fiscal year | 103 |
Prior | 2 |
Revolving Loans Amortized Cost Basis | 111 |
Total Loans | 1,414 |
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 | 52 |
Prior | 15 |
Total Loans | 100 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 138,105 |
Fiscal year before current fiscal year | 108,648 |
Two years before current fiscal year | 4,168 |
Three years before current fiscal year | 26 |
Prior | 457 |
Revolving Loans Amortized Cost Basis | 33,686 |
Total Loans | 285,090 | 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 | 119,503 |
Fiscal year before current fiscal year | 94,469 |
Two years before current fiscal year | 3,821 |
Three years before current fiscal year | 26 |
Prior | 44 |
Revolving Loans Amortized Cost Basis | 31,831 |
Total Loans | 249,694 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 18,089 |
Fiscal year before current fiscal year | 14,076 |
Two years before current fiscal year | 347 |
Prior | 413 |
Revolving Loans Amortized Cost Basis | 1,855 |
Total Loans | 34,780 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 513 |
Total Loans | 513 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 103 |
Total Loans | 103 |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 206,518 |
Fiscal year before current fiscal year | 274,984 |
Two years before current fiscal year | 189,539 |
Three years before current fiscal year | 110,969 |
Four years before current fiscal year | 76,280 |
Prior | 207,878 |
Revolving Loans Amortized Cost Basis | 6,396 |
Total Loans | 1,072,564 | 937,006
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 181,536 |
Fiscal year before current fiscal year | 234,262 |
Two years before current fiscal year | 162,322 |
Three years before current fiscal year | 94,607 |
Four years before current fiscal year | 61,203 |
Prior | 157,490 |
Revolving Loans Amortized Cost Basis | 6,396 |
Total Loans | 897,816 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 23,461 |
Fiscal year before current fiscal year | 39,031 |
Two years before current fiscal year | 25,983 |
Three years before current fiscal year | 14,136 |
Four years before current fiscal year | 12,264 |
Prior | 44,323 |
Total Loans | 159,198 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,521 |
Fiscal year before current fiscal year | 1,492 |
Two years before current fiscal year | 1,050 |
Three years before current fiscal year | 1,701 |
Four years before current fiscal year | 1,826 |
Prior | 3,800 |
Total Loans | 11,390 |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 199 |
Two years before current fiscal year | 184 |
Three years before current fiscal year | 525 |
Four years before current fiscal year | 987 |
Prior | 2,265 |
Total Loans | 4,160 |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 19,083 |
Fiscal year before current fiscal year | 15,112 |
Two years before current fiscal year | 14,974 |
Three years before current fiscal year | 8,664 |
Four years before current fiscal year | 5,830 |
Prior | 16,959 |
Revolving Loans Amortized Cost Basis | 93,292 |
Total Loans | 173,914 | 161,018
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 16,908 |
Fiscal year before current fiscal year | 13,021 |
Two years before current fiscal year | 12,762 |
Three years before current fiscal year | 6,836 |
Four years before current fiscal year | 4,343 |
Prior | 13,031 |
Revolving Loans Amortized Cost Basis | 33,925 |
Total Loans | 100,826 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 1,990 |
Fiscal year before current fiscal year | 1,849 |
Two years before current fiscal year | 1,944 |
Three years before current fiscal year | 1,761 |
Four years before current fiscal year | 1,206 |
Prior | 2,820 |
Revolving Loans Amortized Cost Basis | 58,388 |
Total Loans | 69,958 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 185 |
Fiscal year before current fiscal year | 211 |
Two years before current fiscal year | 91 |
Three years before current fiscal year | 67 |
Four years before current fiscal year | 243 |
Prior | 890 |
Revolving Loans Amortized Cost Basis | 589 |
Total Loans | 2,276 |
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 31 |
Two years before current fiscal year | 177 |
Four years before current fiscal year | 38 |
Prior | 218 |
Revolving Loans Amortized Cost Basis | 390 |
Total Loans | 854 |
Real Estate [Member] | Farmland [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 37,256 |
Fiscal year before current fiscal year | 60,161 |
Two years before current fiscal year | 42,658 |
Three years before current fiscal year | 36,293 |
Four years before current fiscal year | 17,213 |
Prior | 52,231 |
Revolving Loans Amortized Cost Basis | 20,978 |
Total Loans | 266,790 | 272,179
Real Estate [Member] | Farmland [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 26,555 |
Fiscal year before current fiscal year | 40,429 |
Two years before current fiscal year | 32,947 |
Three years before current fiscal year | 21,399 |
Four years before current fiscal year | 11,001 |
Prior | 32,232 |
Revolving Loans Amortized Cost Basis | 6,702 |
Total Loans | 171,265 |
Real Estate [Member] | Farmland [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 8,434 |
Fiscal year before current fiscal year | 16,653 |
Two years before current fiscal year | 7,470 |
Three years before current fiscal year | 13,116 |
Four years before current fiscal year | 6,084 |
Prior | 17,368 |
Revolving Loans Amortized Cost Basis | 12,121 |
Total Loans | 81,246 |
Real Estate [Member] | Farmland [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 2,267 |
Fiscal year before current fiscal year | 1,954 |
Two years before current fiscal year | 1,862 |
Three years before current fiscal year | 1,778 |
Four years before current fiscal year | 70 |
Prior | 2,409 |
Revolving Loans Amortized Cost Basis | 1,923 |
Total Loans | 12,263 |
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 | 58 |
Prior | 222 |
Revolving Loans Amortized Cost Basis | 232 |
Total Loans | 2,016 |
Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 209,815 |
Fiscal year before current fiscal year | 344,327 |
Two years before current fiscal year | 131,116 |
Three years before current fiscal year | 90,926 |
Four years before current fiscal year | 51,494 |
Prior | 81,278 |
Revolving Loans Amortized Cost Basis | 490,746 |
Total Loans | 1,399,702 | 1,416,093
Commercial and Agricultural Non-Real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 160,548 |
Fiscal year before current fiscal year | 271,247 |
Two years before current fiscal year | 100,081 |
Three years before current fiscal year | 71,623 |
Four years before current fiscal year | 22,808 |
Prior | 71,498 |
Revolving Loans Amortized Cost Basis | 337,631 |
Total Loans | 1,035,436 |
Commercial and Agricultural Non-Real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 46,899 |
Fiscal year before current fiscal year | 69,950 |
Two years before current fiscal year | 28,657 |
Three years before current fiscal year | 17,177 |
Four years before current fiscal year | 26,250 |
Prior | 7,737 |
Revolving Loans Amortized Cost Basis | 145,827 |
Total Loans | 342,497 |
Commercial and Agricultural Non-Real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 2,368 |
Fiscal year before current fiscal year | 2,451 |
Two years before current fiscal year | 2,144 |
Three years before current fiscal year | 1,219 |
Four years before current fiscal year | 1,937 |
Prior | 806 |
Revolving Loans Amortized Cost Basis | 7,019 |
Total Loans | 17,944 |
Commercial and Agricultural Non-Real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Fiscal year before current fiscal year | 679 |
Two years before current fiscal year | 234 |
Three years before current fiscal year | 907 |
Four years before current fiscal year | 499 |
Prior | 1,237 |
Revolving Loans Amortized Cost Basis | 269 |
Total Loans | 3,825 |
Consumer Non-real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 126,315 |
Fiscal year before current fiscal year | 156,861 |
Two years before current fiscal year | 61,604 |
Three years before current fiscal year | 35,234 |
Four years before current fiscal year | 12,415 |
Prior | 6,110 |
Revolving Loans Amortized Cost Basis | 41,184 |
Total Loans | 439,723 | 413,370
Consumer Non-real Estate [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 112,598 |
Fiscal year before current fiscal year | 141,806 |
Two years before current fiscal year | 55,814 |
Three years before current fiscal year | 30,229 |
Four years before current fiscal year | 10,829 |
Prior | 3,970 |
Revolving Loans Amortized Cost Basis | 35,949 |
Total Loans | 391,195 |
Consumer Non-real Estate [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 13,357 |
Fiscal year before current fiscal year | 14,002 |
Two years before current fiscal year | 5,298 |
Three years before current fiscal year | 4,529 |
Four years before current fiscal year | 1,395 |
Prior | 2,042 |
Revolving Loans Amortized Cost Basis | 5,233 |
Total Loans | 45,856 |
Consumer Non-real Estate [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 296 |
Fiscal year before current fiscal year | 767 |
Two years before current fiscal year | 405 |
Three years before current fiscal year | 294 |
Four years before current fiscal year | 127 |
Prior | 97 |
Revolving Loans Amortized Cost Basis | 2 |
Total Loans | 1,988 |
Consumer Non-real Estate [Member] | Grade 4 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 64 |
Fiscal year before current fiscal year | 286 |
Two years before current fiscal year | 87 |
Three years before current fiscal year | 182 |
Four years before current fiscal year | 64 |
Prior | 1 |
Total Loans | 684 |
Oil and Gas [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 124,366 |
Fiscal year before current fiscal year | 113,094 |
Two years before current fiscal year | 21,729 |
Three years before current fiscal year | 18,049 |
Four years before current fiscal year | 19,575 |
Prior | 775 |
Revolving Loans Amortized Cost Basis | 185,198 |
Total Loans | 482,786 | $ 428,908
Oil and Gas [Member] | Grade 1 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 115,020 |
Fiscal year before current fiscal year | 101,947 |
Two years before current fiscal year | 18,040 |
Three years before current fiscal year | 4,468 |
Four years before current fiscal year | 1,798 |
Prior | 326 |
Revolving Loans Amortized Cost Basis | 152,151 |
Total Loans | 393,750 |
Oil and Gas [Member] | Grade 2 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 9,301 |
Fiscal year before current fiscal year | 5,414 |
Two years before current fiscal year | 3,681 |
Three years before current fiscal year | 13,581 |
Four years before current fiscal year | 17,777 |
Prior | 250 |
Revolving Loans Amortized Cost Basis | 30,898 |
Total Loans | 80,902 |
Oil and Gas [Member] | Grade 3 [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Current fiscal year | 45 |
Fiscal year before current fiscal year | 4,733 |
Two years before current fiscal year | 8 |
Prior | 199 |
Revolving Loans Amortized Cost Basis | 2,080 |
Total Loans | 7,065 |
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 |

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- Definition Amount of financing receivable originated three years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
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