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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 |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 33,806 |  | $ 34,086
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 44,211 |  | 40,124
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 39,444 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 98 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 16,575 |  | 19,967
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 16,731 |  | 25,207
Related allowance | 3,107 |  | 4,906
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 12,357 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 18 |  |
Recorded investment | 50,381 |  | 54,053
Unpaid principal balance | 60,942 |  | 65,331
Impaired Financing Receivable, Average Recorded Investment | 51,801 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 116 |  |
Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,780 |  | 2,025
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 7,659 |  | 2,725
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,280 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 11 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 8,957 |  | 4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 9,038 |  | 9,377
Related allowance | 2,506 |  | 1,268
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 4,895 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 18 |  |
Construction |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 54 |  | 54
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 53 |  | 53
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 54 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 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 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Residential real estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 10,814 |  | 10,939
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 13,199 |  | 13,258
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 10,892 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 63 |  |
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 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 20,653 |  | 20,650
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 22,754 |  | 23,641
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 25,739 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 22 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 7,618 |  | 15,757
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 7,693 |  | 15,830
Related allowance | 601 |  | 3,638
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 7,462 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Loans to individuals [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 505 |  | 418
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 546 |  | 447
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 479 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 2 |  |
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 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 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 | 1,780 |  | 2,025
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 7,659 |  | 2,725
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,280 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 11 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 8,957 |  | 4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 9,038 |  | 9,377
Related allowance | 2,506 |  | 1,268
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 4,895 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 18 |  |
Senior Lien | Residential real estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,856 |  | 6,062
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 7,402 |  | 7,575
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,982 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 45 |  |
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 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Junior Lien | Residential real estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 4,958 |  | 4,877
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,797 |  | 5,683
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,910 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 18 |  |
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 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Multifamily | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 1
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 82
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 459 |  | 459
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 473 |  | 470
Related allowance | 115 |  | 116
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 464 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 18,125 |  | 16,786
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 19,933 |  | 19,459
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 22,593 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 7 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,917 |  | 15,060
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 6,979 |  | 15,122
Related allowance | 459 |  | 3,508
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,917 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Owner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,528 |  | 3,863
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,821 |  | 4,100
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,146 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 15 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 242 |  | 238
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 241 |  | 238
Related allowance | 27 |  | 14
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 81 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Automobiles | Loans to individuals [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 429 |  | 405
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 465 |  | 430
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 437 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 2 |  |
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 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 |  |
Other Consumer Loans | Loans to individuals [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 76 |  | 13
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 81 |  | 17
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 42 |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 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 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | $ 0 |  |
Originated Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | $ 15,985 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 107 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 21,277 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 19 |
Impaired Financing Receivable, Average Recorded Investment |  | 37,262 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 126 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 925 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 4 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 7,838 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 18 |
Originated Loans [Member] | Construction |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Originated Loans [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 10,529 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 78 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 325 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 4,086 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 22 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 13,114 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 1 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 445 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 3 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Acquired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 2,405 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 2 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 616 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Impaired Financing Receivable, Average Recorded Investment |  | 3,021 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 2 |
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 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Acquired Loans [Member] | Construction |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 2,090 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 2 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 229 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 616 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 12 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method |  | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | $ 0 |

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