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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 31,021 |  | $ 31,021 |  | $ 34,319
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 43,385 |  | 43,385 |  | 45,247
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 34,035 | $ 29,690 | 33,846 | $ 30,233 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (33) | (138) | (12) | (262) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 16,988 |  | 16,988 |  | 1,168
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 17,852 |  | 17,852 |  | 1,186
Related allowance | 12,570 |  | 12,570 |  | 711
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 12,882 | 6,510 | 9,186 | 7,024 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Recorded investment | 48,009 |  | 48,009 |  | 35,487
Unpaid principal balance | 61,237 |  | 61,237 |  | 46,433
Impaired Financing Receivable, Average Recorded Investment | 46,917 | 36,200 | 43,032 | 37,257 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | (33) | (138) | (12) | (262) |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,878 |  | 1,878 |  | 3,141
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,270 |  | 10,270 |  | 9,555
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,416 | 3,822 | 4,444 | 3,883 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (10) | (27) | (10) | (50) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 15,152 |  | 15,152 |  | 1,168
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 15,826 |  | 15,826 |  | 1,186
Related allowance | 12,404 |  | 12,404 |  | 711
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 11,445 | 0 | 8,056 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 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
Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 6,266 |  | 6,266 |  | 9,145
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 8,071 |  | 8,071 |  | 11,010
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 6,312 | 8,769 | 6,190 | 8,985 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (19) | (57) | (40) | (141) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,236 |  | 1,236 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,406 |  | 1,406 |  | 0
Related allowance | 103 |  | 103 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,237 | 0 | 1,030 | 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 | 22,409 |  | 22,409 |  | 21,505
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 24,509 |  | 24,509 |  | 24,119
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 22,853 | 16,676 | 22,769 | 16,933 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (43) | (49) | (43) | (63) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 600 |  | 600 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 620 |  | 620 |  | 0
Related allowance | 63 |  | 63 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 200 | 6,510 | 100 | 7,024 |
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 | 468 |  | 468 |  | 528
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 535 |  | 535 |  | 563
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 454 | 423 | 443 | 432 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (1) | (5) | (1) | (8) |
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 | 0 | 0 | 0 |
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 | 1,755 |  | 1,755 |  | 3,141
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,147 |  | 10,147 |  | 9,555
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,332 | 3,822 | 4,283 | 3,883 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (10) | (27) | (10) | (50) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 15,152 |  | 15,152 |  | 1,168
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 15,826 |  | 15,826 |  | 1,186
Related allowance | 12,404 |  | 12,404 |  | 711
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 11,445 | 0 | 8,056 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Senior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,548 |  | 3,548 |  | 5,754
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,618 |  | 4,618 |  | 6,848
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,584 | 4,963 | 3,510 | 5,080 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (19) | (43) | (40) | (105) |
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 | 2,718 |  | 2,718 |  | 3,391
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,453 |  | 3,453 |  | 4,162
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,728 | 3,806 | 2,680 | 3,905 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | (14) | 0 | (36) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,236 |  | 1,236 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,406 |  | 1,406 |  | 0
Related allowance | 103 |  | 103 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,237 | 0 | 1,030 | 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 | 68 |  | 68 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 68 |  | 68 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 23 | 273 | 11 | 344 |
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 |
Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 20,649 |  | 20,649 |  | 20,155
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 22,931 |  | 22,931 |  | 22,565
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 20,527 | 14,796 | 20,565 | 14,986 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (4) | (42) | (4) | (52) |
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 | 6,510 | 0 | 7,024 |
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 | 1,692 |  | 1,692 |  | 1,350
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,510 |  | 1,510 |  | 1,554
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,303 | 1,607 | 2,193 | 1,603 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (47) | (7) | (47) | (11) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 600 |  | 600 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 620 |  | 620 |  | 0
Related allowance | 63 |  | 63 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 200 | 0 | 100 | 0 |
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 | 350 |  | 350 |  | 440
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 418 |  | 418 |  | 475
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 353 | 365 | 355 | 361 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (1) | (5) | (1) | (8) |
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 | 118 |  | 118 |  | 88
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 117 |  | 117 |  | 88
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 101 | 58 | 88 | 71 |
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 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 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
Construction Residential | Real estate construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
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 |
Construction Other | Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 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
Construction Other | Real estate construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
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 Other | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 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 |  | 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 |
Equipment Finance | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 123 |  | 123 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 123 |  | 123 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 84 | 0 | 161 | 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 |  | 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 |

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