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Significant Accounting Policies - Schedule of Impact of CECL Adoption (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | $ 28,511 | $ 27,773 | $ 27,435 | $ 26,641
Reserve for Unfunded Commitments | $ 3,400 | $ 3,400 |  |  |  |
Total Reserve for Credit Losses | 35,280 |  | 28,511 |  |  |
Decrease to Retained Earnings | 176,644 |  | 156,492 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Decrease to Retained Earnings | (6,100) | 6,100 |  |  |  |
ASU 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 34,475 |  |  |  |
Reserve for Unfunded Commitments |  | 3,386 |  |  |  |
Total Reserve for Credit Losses |  | 37,861 |  |  |  |
ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 4,296 |  |  |  |
Reserve for Unfunded Commitments |  | 3,386 |  |  |  |
Total Reserve for Credit Losses |  | 7,682 |  |  |  |
Retained Earnings, Total Pre-tax Impact |  | (7,682) |  |  |  |
Retained Earnings, Tax Effect |  | 1,613 |  |  |  |
ASU 2016-13 [Member] | CECL Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Decrease to Retained Earnings |  | (6,069) |  |  |  |
ASU 2016-13 [Member] | PCD Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 1,668 |  |  |  |
Total Reserve for Credit Losses | $ 1,668 | 1,668 |  |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | 3,011 | 2,729 | 2,790 | 2,600
Commercial and Agriculture [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 3,830 |  |  |  |
Commercial and Agriculture [Member] | ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 429 |  |  |  |
Commercial and Agriculture [Member] | ASU 2016-13 [Member] | PCD Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 390 |  |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | 4,565 | 4,926 | 4,729 | 4,464
Commercial Real Estate Owner Occupied [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 5,819 |  |  |  |
Commercial Real Estate Owner Occupied [Member] | ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 1,075 |  |  |  |
Commercial Real Estate Owner Occupied [Member] | ASU 2016-13 [Member] | PCD Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 179 |  |  |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | 14,138 | 14,427 | 14,711 | 13,860
Commercial Real Estate Non Owner Occupied [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 11,291 |  |  |  |
Commercial Real Estate Non Owner Occupied [Member] | ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | (2,847) |  |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | 3,145 | 3,036 | 2,859 | 2,597
Residential Real Estate [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 6,293 |  |  |  |
Residential Real Estate [Member] | ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 2,762 |  |  |  |
Residential Real Estate [Member] | ASU 2016-13 [Member] | PCD Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 386 |  |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | 2,293 | 2,013 | 1,969 | 1,810
Real Estate Construction [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 3,795 |  |  |  |
Real Estate Construction [Member] | ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 1,502 |  |  |  |
Farm Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | 291 | 251 | 236 | 287
Farm Real Estate [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 263 |  |  |  |
Farm Real Estate [Member] | ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | (28) |  |  |  |
Lease Financing Receivables [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | 429 |  |  |
Lease Financing Receivables [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 2,807 |  |  |  |
Lease Financing Receivables [Member] | ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 1,743 |  |  |  |
Lease Financing Receivables [Member] | ASU 2016-13 [Member] | PCD Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 635 |  |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | 98 | 142 | 130 | 176
Consumer and Other [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 377 |  |  |  |
Consumer and Other [Member] | ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 201 |  |  |  |
Consumer and Other [Member] | ASU 2016-13 [Member] | PCD Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | 78 |  |  |  |
Unallocated [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  | $ 541 | $ 249 | $ 11 | $ 847
Unallocated [Member] | ASU 2016-13 [Member] | CECL Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  | $ (541) |  |  |  |

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