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Allowance for Loan Losses - Impaired Loans Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 1,738	$ 1,012
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,763	1,037
Impaired financing receivables, with an allowance recorded, Recorded Investment	164	210
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	168	214
Impaired financing receivables, with an allowance recorded, Related Allowance	7	18
Impaired financing receivables, Recorded Investment, Total	1,902	1,222
Impaired financing receivables, Unpaid Principal Balance, Total	1,931	1,251
Impaired financing receivables, Related Allowance, Total	7	18
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	343
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	343
Impaired financing receivables, Recorded Investment, Total	343
Impaired financing receivables, Unpaid Principal Balance, Total	343
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	676
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	676
Impaired financing receivables, with an allowance recorded, Recorded Investment	157	187
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	157	187
Impaired financing receivables, with an allowance recorded, Related Allowance	6	7
Impaired financing receivables, Recorded Investment, Total	833	187
Impaired financing receivables, Unpaid Principal Balance, Total	833	187
Impaired financing receivables, Related Allowance, Total	6	7
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	140
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	140
Impaired financing receivables, Recorded Investment, Total	140
Impaired financing receivables, Unpaid Principal Balance, Total	140
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	579	503
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	604	528
Impaired financing receivables, with an allowance recorded, Recorded Investment	7	23
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	11	27
Impaired financing receivables, with an allowance recorded, Related Allowance	1	11
Impaired financing receivables, Recorded Investment, Total	586	526
Impaired financing receivables, Unpaid Principal Balance, Total	615	555
Impaired financing receivables, Related Allowance, Total	$ 1	11
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment		509
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance		509
Impaired financing receivables, Recorded Investment, Total		509
Impaired financing receivables, Unpaid Principal Balance, Total		$ 509

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Impaired financing receivable with and no related allowance.

+ References

No definition available.

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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