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Allowance for Loan Losses - Schedule of Amortized Cost Basis of Collateral Dependent Loans Individually Evaluated Expected Credit Losses and Related Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated for expected credit losses |  | $ 624
Loans individually evaluated allowance for credit losses |  | 7
Real Estate Loan [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated for expected credit losses | $ 1,205 |
Other Loan [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated for expected credit losses | 5,371 |
Amortized Cost Basis Of Collateral Dependent Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated allowance for credit losses | 864 |
Commercial and Agriculture [Member] | Other Loan [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated for expected credit losses | 4,846 |
Commercial and Agriculture [Member] | Amortized Cost Basis Of Collateral Dependent Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated allowance for credit losses | 408 |
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated for expected credit losses |  | 232
Loans individually evaluated allowance for credit losses |  | 6
Commercial Real Estate Non Owner Occupied [Member] | Real Estate Loan [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated for expected credit losses | 1,205 |
Commercial Real Estate Non Owner Occupied [Member] | Amortized Cost Basis Of Collateral Dependent Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated allowance for credit losses | 306 |
Residential Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated for expected credit losses |  | 392
Loans individually evaluated allowance for credit losses |  | $ 1
Lease Financing Receivable [Member] | Other Loan [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated for expected credit losses | 525 |
Lease Financing Receivable [Member] | Amortized Cost Basis Of Collateral Dependent Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Loans individually evaluated allowance for credit losses | $ 150 |

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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