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Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 28,474 |  | $ 28,474 |  | $ 34,086
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 41,980 |  | 41,980 |  | 40,124
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 36,443 |  | 41,123 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 131 |  | 438 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 9,612 |  | 9,612 |  | 19,967
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 9,692 |  | 9,692 |  | 25,207
Related allowance | 980 |  | 980 |  | 4,906
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 9,318 |  | 9,228 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 19 |  | 50 |  |
Recorded investment | 38,086 |  | 38,086 |  | 54,053
Unpaid principal balance | 51,672 |  | 51,672 |  | 65,331
Impaired Financing Receivable, Average Recorded Investment | 45,761 |  | 50,351 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 150 |  | 488 |  |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 4,836 |  | 4,836 |  | 2,025
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 15,308 |  | 15,308 |  | 2,725
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 9,858 |  | 9,266 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 3 |  | 50 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,899 |  | 1,899 |  | 4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,898 |  | 1,898 |  | 9,377
Related allowance | 479 |  | 479 |  | 1,268
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,842 |  | 1,820 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 19 |  | 50 |  |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 54 |  | 54 |  | 54
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 53 |  | 53 |  | 53
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 54 |  | 54 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 9,910 |  | 9,910 |  | 10,939
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 12,101 |  | 12,101 |  | 13,258
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 10,060 |  | 10,504 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 54 |  | 275 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 13,176 |  | 13,176 |  | 20,650
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 13,981 |  | 13,981 |  | 23,641
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 15,967 |  | 20,813 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 68 |  | 101 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 7,713 |  | 7,713 |  | 15,757
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 7,794 |  | 7,794 |  | 15,830
Related allowance | 501 |  | 501 |  | 3,638
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 7,476 |  | 7,408 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 498 |  | 498 |  | 418
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 537 |  | 537 |  | 447
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 504 |  | 486 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 6 |  | 12 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Time and Demand Loans | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 4,836 |  | 4,836 |  | 2,025
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 15,308 |  | 15,308 |  | 2,725
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 9,858 |  | 9,266 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 3 |  | 50 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,899 |  | 1,899 |  | 4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,898 |  | 1,898 |  | 9,377
Related allowance | 479 |  | 479 |  | 1,268
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,842 |  | 1,820 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 19 |  | 50 |  |
Senior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,599 |  | 5,599 |  | 6,062
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 7,003 |  | 7,003 |  | 7,575
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,558 |  | 5,734 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 34 |  | 210 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Junior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 4,311 |  | 4,311 |  | 4,877
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,098 |  | 5,098 |  | 5,683
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,502 |  | 4,770 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 20 |  | 65 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Multifamily | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 1
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 82
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 435 |  | 435 |  | 459
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 456 |  | 456 |  | 470
Related allowance | 103 |  | 103 |  | 116
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 439 |  | 451 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 11,531 |  | 11,531 |  | 16,786
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 12,147 |  | 12,147 |  | 19,459
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 13,633 |  | 18,050 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 4 |  | 15 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,917 |  | 6,917 |  | 15,060
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 6,979 |  | 6,979 |  | 15,122
Related allowance | 338 |  | 338 |  | 3,508
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,917 |  | 6,917 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Owner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,645 |  | 1,645 |  | 3,863
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,834 |  | 1,834 |  | 4,100
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,334 |  | 2,763 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 64 |  | 86 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 361 |  | 361 |  | 238
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 359 |  | 359 |  | 238
Related allowance | 60 |  | 60 |  | 14
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 120 |  | 40 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Automobiles | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 442 |  | 442 |  | 405
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 476 |  | 476 |  | 430
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 448 |  | 433 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 6 |  | 12 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Other Consumer Loans | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 56 |  | 56 |  | 13
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 61 |  | 61 |  | 17
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 56 |  | 53 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | $ 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | $ 0 |  | $ 0 |  |
Originated Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | $ 26,940 |  | $ 28,911 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 108 |  | 349 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 23,830 |  | 18,399 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 19 |  | 54 |
Impaired Financing Receivable, Average Recorded Investment |  | 50,770 |  | 47,310 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 127 |  | 403 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 1,918 |  | 4,062 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 10 |  | 15 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 6,423 |  | 4,569 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 16 |  | 45 |
Originated Loans [Member] | Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 18 |  | 6 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 10,198 |  | 10,380 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 72 |  | 235 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 14,312 |  | 13,994 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 23 |  | 90 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 17,407 |  | 13,830 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 3 |  | 9 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 494 |  | 469 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 3 |  | 9 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Acquired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 3,306 |  | 3,447 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 77 |  | 94 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Impaired Financing Receivable, Average Recorded Investment |  | 3,306 |  | 3,447 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 77 |  | 94 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 74 |  | 74 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Acquired Loans [Member] | Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 308 |  | 137 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 1,473 |  | 1,772 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 1 |  | 18 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 1,440 |  | 1,453 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 76 |  | 76 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 11 |  | 11 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | $ 0 |  | $ 0 |

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