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Significant Accounting Policies - Schedule of Impact of CECL Adoption (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Credit Losses |  |  |  | $ 28,511
Reserve for Unfunded Commitments | $ 3,400 |  | $ 3,400 |
Total Reserve for Credit Losses |  |  |  | 28,511
Decrease to Retained Earnings | 198,034 | $ 183,788 |  |
CECL Adoption Adjustments [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 |
CECL Loans [Member] | ASU 2016-13 [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 |
CECL Loans [Member] | ASU 2016-13 [Member] | CECL Adoption Adjustments [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Decrease to Retained Earnings |  |  | (6,069) |
PCD Loans [Member] | ASU 2016-13 [Member] | CECL Adoption Adjustments [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Credit Losses |  |  | 1,668 |
Total Reserve for Credit Losses |  |  | 1,668 |
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Credit Losses |  |  |  | 3,011
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] | CECL Loans [Member] | ASU 2016-13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Credit Losses |  |  | 429 |
Commercial and Agriculture [Member] | PCD Loans [Member] | ASU 2016-13 [Member] | CECL Adoption Adjustments [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
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] | CECL Loans [Member] | ASU 2016-13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Credit Losses |  |  | 1,075 |
Commercial Real Estate Owner Occupied [Member] | PCD Loans [Member] | ASU 2016-13 [Member] | CECL Adoption Adjustments [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
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] | CECL Loans [Member] | ASU 2016-13 [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
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] | CECL Loans [Member] | ASU 2016-13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Credit Losses |  |  | 2,762 |
Residential Real Estate [Member] | PCD Loans [Member] | ASU 2016-13 [Member] | CECL Adoption Adjustments [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
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] | CECL Loans [Member] | ASU 2016-13 [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
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] | CECL Loans [Member] | ASU 2016-13 [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] | CECL Loans [Member] | ASU 2016-13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Credit Losses |  |  | 1,743 |
Lease Financing Receivables [Member] | PCD Loans [Member] | ASU 2016-13 [Member] | CECL Adoption Adjustments [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
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] | CECL Loans [Member] | ASU 2016-13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Credit Losses |  |  | 201 |
Consumer and Other [Member] | PCD Loans [Member] | ASU 2016-13 [Member] | CECL Adoption Adjustments [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
Unallocated [Member] | CECL Loans [Member] | ASU 2016-13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Credit Losses |  |  | $ (541) |

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