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Allowance for Loan Losses - Impaired Loans Excluding Purchased-Credit Impaired ("PCI") Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 1,273	$ 2,338
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,298	2,363
Impaired financing receivables, with an allowance recorded, Recorded Investment	248	328
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	252	332
Impaired financing receivables, with an allowance recorded, Related Allowance	34	107
Impaired financing receivables, Recorded Investment, Total	1,521	2,666
Impaired financing receivables, Unpaid Principal Balance, Total	1,550	2,695
Impaired financing receivables, Related Allowance, Total	34	107
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with an allowance recorded, Recorded Investment		74
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance		74
Impaired financing receivables, with an allowance recorded, Related Allowance		73
Impaired financing receivables, Recorded Investment, Total		74
Impaired financing receivables, Unpaid Principal Balance, Total		74
Impaired financing receivables, Related Allowance, Total		73
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	92	757
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	92	757
Impaired financing receivables, with an allowance recorded, Recorded Investment	217	223
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	217	223
Impaired financing receivables, with an allowance recorded, Related Allowance	5	5
Impaired financing receivables, Recorded Investment, Total	309	980
Impaired financing receivables, Unpaid Principal Balance, Total	309	980
Impaired financing receivables, Related Allowance, Total	5	5
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	39	48
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	39	48
Impaired financing receivables, Recorded Investment, Total	39	48
Impaired financing receivables, Unpaid Principal Balance, Total	39	48
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	537	915
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	562	940
Impaired financing receivables, with an allowance recorded, Recorded Investment	31	31
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	35	35
Impaired financing receivables, with an allowance recorded, Related Allowance	29	29
Impaired financing receivables, Recorded Investment, Total	568	946
Impaired financing receivables, Unpaid Principal Balance, Total	597	975
Impaired financing receivables, Related Allowance, Total	29	29
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	605	618
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	605	618
Impaired financing receivables, Recorded Investment, Total	605	618
Impaired financing receivables, Unpaid Principal Balance, Total	$ 605	$ 618

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Impaired financing receivable with and no related allowance.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
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