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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 28,034 |  | $ 28,034 |  | $ 54,167
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 37,309 |  | 37,309 |  | 63,660
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 29,066 | $ 36,443 | 29,844 | $ 41,123 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 110 | 131 | 380 | 438 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 7,658 |  | 7,658 |  | 1,013
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 8,755 |  | 8,755 |  | 1,060
Related allowance | 1,534 |  | 1,534 |  | 395
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,920 | 9,318 | 6,990 | 9,228 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 19 | 0 | 50 |
Recorded investment | 35,692 |  | 35,692 |  | 55,180
Unpaid principal balance | 46,064 |  | 46,064 |  | 64,720
Impaired Financing Receivable, Average Recorded Investment | 35,986 | 45,761 | 36,834 | 50,351 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 110 | 150 | 380 | 488 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,381 |  | 3,381 |  | 3,720
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 9,749 |  | 9,749 |  | 10,303
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,518 | 9,858 | 3,762 | 9,266 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 30 | 3 | 88 | 50 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,380 |  | 1,380 |  | 327
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,555 |  | 1,555 |  | 349
Related allowance | 1,380 |  | 1,380 |  | 307
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 584 | 1,842 | 195 | 1,820 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 19 | 0 | 50 |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 45
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 53
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
Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 8,711 |  | 8,711 |  | 9,365
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,573 |  | 10,573 |  | 11,294
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 8,981 | 10,060 | 8,984 | 10,504 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 48 | 54 | 190 | 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 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 15,467 |  | 15,467 |  | 40,591
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 16,434 |  | 16,434 |  | 41,525
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 16,124 | 15,967 | 16,663 | 20,813 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 27 | 68 | 89 | 101 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,278 |  | 6,278 |  | 686
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 7,200 |  | 7,200 |  | 711
Related allowance | 154 |  | 154 |  | 88
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,336 | 7,476 | 6,795 | 7,408 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 475 |  | 475 |  | 446
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 553 |  | 553 |  | 485
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 443 | 504 | 435 | 486 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 5 | 6 | 13 | 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 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Real estate construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 54 | 0 | 54 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 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 | 3,381 |  | 3,381 |  | 3,720
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 9,749 |  | 9,749 |  | 10,303
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,518 | 9,858 | 3,762 | 9,266 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 30 | 3 | 88 | 50 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,380 |  | 1,380 |  | 327
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,555 |  | 1,555 |  | 349
Related allowance | 1,380 |  | 1,380 |  | 307
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 584 | 1,842 | 195 | 1,820 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 19 | 0 | 50 |
Senior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,180 |  | 5,180 |  | 5,200
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 6,262 |  | 6,262 |  | 6,337
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,200 | 5,558 | 5,120 | 5,734 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 33 | 34 | 139 | 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 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Junior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,531 |  | 3,531 |  | 4,165
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,311 |  | 4,311 |  | 4,957
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,781 | 4,502 | 3,864 | 4,770 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 15 | 20 | 51 | 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 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Multifamily | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 14,677
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 14,677
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 0 | 230 | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 421
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 446
Related allowance | 0 |  | 0 |  | 88
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 439 | 0 | 451 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 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 | 14,121 |  | 14,121 |  | 24,581
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 14,896 |  | 14,896 |  | 25,310
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 14,637 | 13,633 | 14,869 | 18,050 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 18 | 4 | 69 | 15 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,278 |  | 6,278 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 7,200 |  | 7,200 |  | 0
Related allowance | 154 |  | 154 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,336 | 6,917 | 6,795 | 6,917 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 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 | 1,346 |  | 1,346 |  | 1,333
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,538 |  | 1,538 |  | 1,538
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,487 | 2,334 | 1,564 | 2,763 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 9 | 64 | 20 | 86 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 265
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 265
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 120 | 0 | 40 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Automobiles | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 408 |  | 408 |  | 388
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 481 |  | 481 |  | 422
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 369 | 448 | 363 | 433 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 5 | 6 | 13 | 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 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Other Consumer Loans | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 67 |  | 67 |  | 58
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 72 |  | 72 |  | 63
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 74 | 56 | 72 | 53 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 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 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | $ 0 | 0 | $ 0 |
Construction Residential | Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  |
Related allowance | 0 |  | 0 |  |
Construction Residential | Real estate construction [Member] |  |  |  |  |
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 |  |
Construction Other | Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  |
Related allowance | 0 |  | 0 |  |
Construction Other | Real estate construction [Member] |  |  |  |  |
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 |  |
Time and Demand Loans Other | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  |
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 | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  |
Related allowance | 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 |  |
Equipment Finance | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  |
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 | 0 |  | 0 |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  |
Related allowance | 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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