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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 29,239 |  | $ 29,239 |  | $ 54,167
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 37,765 |  | 37,765 |  | 63,660
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 29,690 | $ 30,369 | 30,233 | $ 31,102 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 138 | 201 | 262 | 300 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,453 |  | 6,453 |  | 1,013
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 7,263 |  | 7,263 |  | 1,060
Related allowance | 360 |  | 360 |  | 395
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,510 | 23,120 | 7,024 | 21,543 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 19 | 0 | 36 |
Recorded investment | 35,692 |  | 35,692 |  | 55,180
Unpaid principal balance | 45,028 |  | 45,028 |  | 64,720
Impaired Financing Receivable, Average Recorded Investment | 36,200 | 53,489 | 37,257 | 52,645 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 138 | 220 | 262 | 336 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,653 |  | 3,653 |  | 3,720
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,002 |  | 10,002 |  | 10,303
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,822 | 5,591 | 3,883 | 3,966 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 27 | 31 | 50 | 43 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 327
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 349
Related allowance | 0 |  | 0 |  | 307
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 8,791 | 0 | 6,813 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 19 | 0 | 36 |
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 | 8,638 |  | 8,638 |  | 9,365
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,527 |  | 10,527 |  | 11,294
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 8,769 | 10,560 | 8,985 | 10,726 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 57 | 159 | 141 | 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 | 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 | 16,510 |  | 16,510 |  | 40,591
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 16,752 |  | 16,752 |  | 41,525
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 16,676 | 13,689 | 16,933 | 15,879 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 49 | 7 | 63 | 30 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,453 |  | 6,453 |  | 686
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 7,263 |  | 7,263 |  | 711
Related allowance | 360 |  | 360 |  | 88
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,510 | 14,329 | 7,024 | 14,730 |
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 | 438 |  | 438 |  | 446
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 484 |  | 484 |  | 485
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 423 | 475 | 432 | 477 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 5 | 4 | 8 | 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 | 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 | 3,653 |  | 3,653 |  | 3,720
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,002 |  | 10,002 |  | 10,303
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,822 | 5,591 | 3,883 | 3,966 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 27 | 31 | 50 | 43 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 327
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 349
Related allowance | 0 |  | 0 |  | 307
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 8,791 | 0 | 6,813 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 19 | 0 | 36 |
Senior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 4,859 |  | 4,859 |  | 5,200
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,950 |  | 5,950 |  | 6,337
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,963 | 5,661 | 5,080 | 5,822 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 43 | 132 | 105 | 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 | 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 | 3,779 |  | 3,779 |  | 4,165
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,577 |  | 4,577 |  | 4,957
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,806 | 4,899 | 3,905 | 4,904 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 14 | 27 | 36 | 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 | 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 | 273 | 0 | 344 | 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 | 450 | 0 | 457 |
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 | 14,913 |  | 14,913 |  | 24,581
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 14,939 |  | 14,939 |  | 25,310
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 14,796 | 11,227 | 14,986 | 13,079 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 42 | 2 | 52 | 10 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,453 |  | 6,453 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 7,263 |  | 7,263 |  | 0
Related allowance | 360 |  | 360 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,510 | 13,614 | 7,024 | 14,096 |
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 | 1,597 |  | 1,597 |  | 1,333
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,813 |  | 1,813 |  | 1,538
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,607 | 2,462 | 1,603 | 2,800 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 7 | 5 | 11 | 20 |
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 | 265 | 0 | 177 |
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 | 364 |  | 364 |  | 388
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 405 |  | 405 |  | 422
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 365 | 415 | 361 | 426 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 5 | 4 | 8 | 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 | 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 | 74 |  | 74 |  | 58
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 79 |  | 79 |  | 63
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 58 | 60 | 71 | 51 |
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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