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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 29,732 |  | $ 29,732 |  | $ 34,086
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 41,391 |  | 41,391 |  | 40,124
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 30,369 |  | 31,102 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 201 |  | 300 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 23,061 |  | 23,061 |  | 19,967
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 24,739 |  | 24,739 |  | 25,207
Related allowance | 2,946 |  | 2,946 |  | 4,906
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 23,120 |  | 21,543 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 19 |  | 36 |  |
Recorded investment | 52,793 |  | 52,793 |  | 54,053
Unpaid principal balance | 66,130 |  | 66,130 |  | 65,331
Impaired Financing Receivable, Average Recorded Investment | 53,489 |  | 52,645 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 220 |  | 336 |  |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,598 |  | 5,598 |  | 2,025
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 14,230 |  | 14,230 |  | 2,725
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,591 |  | 3,966 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 31 |  | 43 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 8,737 |  | 8,737 |  | 4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 8,889 |  | 8,889 |  | 9,377
Related allowance | 2,358 |  | 2,358 |  | 1,268
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 8,791 |  | 6,813 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 19 |  | 36 |  |
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 | 10,029 |  | 10,029 |  | 10,939
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 12,207 |  | 12,207 |  | 13,258
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 10,560 |  | 10,726 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 159 |  | 221 |  |
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 | 13,575 |  | 13,575 |  | 20,650
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 14,388 |  | 14,388 |  | 23,641
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 13,689 |  | 15,879 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 7 |  | 30 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 14,324 |  | 14,324 |  | 15,757
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 15,850 |  | 15,850 |  | 15,830
Related allowance | 588 |  | 588 |  | 3,638
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 14,329 |  | 14,730 |  |
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 | 476 |  | 476 |  | 418
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 513 |  | 513 |  | 447
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 475 |  | 477 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 4 |  | 6 |  |
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 | 5,598 |  | 5,598 |  | 2,025
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 14,230 |  | 14,230 |  | 2,725
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,591 |  | 3,966 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 31 |  | 43 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 8,737 |  | 8,737 |  | 4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 8,889 |  | 8,889 |  | 9,377
Related allowance | 2,358 |  | 2,358 |  | 1,268
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 8,791 |  | 6,813 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 19 |  | 36 |  |
Senior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,364 |  | 5,364 |  | 6,062
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 6,746 |  | 6,746 |  | 7,575
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,661 |  | 5,822 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 132 |  | 176 |  |
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 | 4,665 |  | 4,665 |  | 4,877
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,461 |  | 5,461 |  | 5,683
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,899 |  | 4,904 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 27 |  | 45 |  |
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 | 445 |  | 445 |  | 459
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 463 |  | 463 |  | 470
Related allowance | 113 |  | 113 |  | 116
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 450 |  | 457 |  |
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 | 11,134 |  | 11,134 |  | 16,786
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 11,621 |  | 11,621 |  | 19,459
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 11,227 |  | 13,079 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 2 |  | 10 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 13,614 |  | 13,614 |  | 15,060
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 15,122 |  | 15,122 |  | 15,122
Related allowance | 475 |  | 475 |  | 3,508
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 13,614 |  | 14,096 |  |
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 | 2,441 |  | 2,441 |  | 3,863
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,767 |  | 2,767 |  | 4,100
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,462 |  | 2,800 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 5 |  | 20 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 265 |  | 265 |  | 238
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 265 |  | 265 |  | 238
Related allowance | 0 |  | 0 |  | 14
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 265 |  | 177 |  |
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 | 419 |  | 419 |  | 405
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 452 |  | 452 |  | 430
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 415 |  | 426 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 4 |  | 6 |  |
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 | 57 |  | 57 |  | 13
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 61 |  | 61 |  | 17
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 60 |  | 51 |  |
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 |  | $ 34,473 |  | $ 31,900 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 144 |  | 266 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 19,424 |  | 13,680 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 5 |
Impaired Financing Receivable, Average Recorded Investment |  | 53,897 |  | 45,580 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 144 |  | 271 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 6,758 |  | 6,894 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 12 |  | 34 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 2,028 |  | 1,881 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 1 |
Originated Loans [Member] | Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
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, 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 |  | 9,836 |  | 10,182 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 80 |  | 159 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 254 |  | 290 |
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 |  | 17,411 |  | 14,367 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 48 |  | 67 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 17,142 |  | 11,509 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 4 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 468 |  | 457 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 4 |  | 6 |
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 |  | 2,084 |  | 2,245 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 15 |  | 17 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 1,931 |  | 1,273 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Impaired Financing Receivable, Average Recorded Investment |  | 4,015 |  | 3,518 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 15 |  | 17 |
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 |  | 0 |  | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 103 |  | 51 |
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 |  | 1,753 |  | 1,922 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 15 |  | 17 |
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 |  | 246 |  | 238 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 1,828 |  | 1,222 |
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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