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Allowance for Loan Losses - Impaired Loans Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 2,753	$ 3,146
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	2,825	3,218
Impaired financing receivables, with an allowance recorded, Recorded Investment	440	451
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	444	455
Impaired financing receivables, with an allowance recorded, Related Allowance	92	91
Impaired financing receivables, Recorded Investment, Total	3,193	3,597
Impaired financing receivables, Unpaid Principal Balance, Total	3,269	3,673
Impaired financing receivables, Related Allowance, Total	92	91
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment		367
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance		367
Impaired financing receivables, Recorded Investment, Total		367
Impaired financing receivables, Unpaid Principal Balance, Total		367
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	162	168
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	162	168
Impaired financing receivables, with an allowance recorded, Recorded Investment	253	258
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	253	258
Impaired financing receivables, with an allowance recorded, Related Allowance	9	9
Impaired financing receivables, Recorded Investment, Total	415	426
Impaired financing receivables, Unpaid Principal Balance, Total	415	426
Impaired financing receivables, Related Allowance, Total	9	9
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	371	374
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	371	374
Impaired financing receivables, Recorded Investment, Total	371	374
Impaired financing receivables, Unpaid Principal Balance, Total	371	374
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	1,555	1,571
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,627	1,643
Impaired financing receivables, with an allowance recorded, Recorded Investment	187	193
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	191	197
Impaired financing receivables, with an allowance recorded, Related Allowance	83	82
Impaired financing receivables, Recorded Investment, Total	1,742	1,764
Impaired financing receivables, Unpaid Principal Balance, Total	1,818	1,840
Impaired financing receivables, Related Allowance, Total	83	82
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	665	666
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	665	666
Impaired financing receivables, Recorded Investment, Total	665	666
Impaired financing receivables, Unpaid Principal Balance, Total	$ 665	$ 666

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Impaired financing receivable with and no related allowance.

+ References

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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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