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Allowance for Loan Losses - Impaired Loans Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 2,483	$ 1,864
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	2,555	1,939
Impaired financing receivables, with an allowance recorded, Recorded Investment	530	993
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	534	996
Impaired financing receivables, with an allowance recorded, Related Allowance	107	141
Impaired financing receivables, Recorded Investment, Total	3,013	2,857
Impaired financing receivables, Unpaid Principal Balance, Total	3,089	2,935
Impaired financing receivables, Related Allowance, Total	107	141
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	367	367
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	367	367
Impaired financing receivables, Recorded Investment, Total	367	367
Impaired financing receivables, Unpaid Principal Balance, Total	367	367
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	179	193
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	179	193
Impaired financing receivables, with an allowance recorded, Recorded Investment	280	291
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	280	291
Impaired financing receivables, with an allowance recorded, Related Allowance	10	12
Impaired financing receivables, Recorded Investment, Total	459	484
Impaired financing receivables, Unpaid Principal Balance, Total	459	484
Impaired financing receivables, Related Allowance, Total	10	12
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	379	31
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	379	34
Impaired financing receivables, Recorded Investment, Total	379	31
Impaired financing receivables, Unpaid Principal Balance, Total	379	34
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	876	1,017
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	948	1,089
Impaired financing receivables, with an allowance recorded, Recorded Investment	250	262
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	254	265
Impaired financing receivables, with an allowance recorded, Related Allowance	97	122
Impaired financing receivables, Recorded Investment, Total	1,126	1,279
Impaired financing receivables, Unpaid Principal Balance, Total	1,202	1,354
Impaired financing receivables, Related Allowance, Total	97	122
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	682	256
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	682	256
Impaired financing receivables, with an allowance recorded, Recorded Investment		440
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance		440
Impaired financing receivables, with an allowance recorded, Related Allowance		7
Impaired financing receivables, Recorded Investment, Total	682	696
Impaired financing receivables, Unpaid Principal Balance, Total	$ 682	696
Impaired financing receivables, Related Allowance, Total		$ 7

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Impaired financing receivable with and no related allowance.

+ References

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- Definition

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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-Publisher FASB
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