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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, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 2,393	$ 1,864
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	2,465	1,939
Impaired financing receivables, with an allowance recorded, Recorded Investment	506	993
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	510	996
Impaired financing receivables, with an allowance recorded, Related Allowance	104	141
Impaired financing receivables, Recorded Investment, Total	2,899	2,857
Impaired financing receivables, Unpaid Principal Balance, Total	2,975	2,935
Impaired financing receivables, Related Allowance, Total	104	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	175	193
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	175	193
Impaired financing receivables, with an allowance recorded, Recorded Investment	261	291
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	261	291
Impaired financing receivables, with an allowance recorded, Related Allowance	6	12
Impaired financing receivables, Recorded Investment, Total	436	484
Impaired financing receivables, Unpaid Principal Balance, Total	436	484
Impaired financing receivables, Related Allowance, Total	6	12
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	376	31
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	376	34
Impaired financing receivables, Recorded Investment, Total	376	31
Impaired financing receivables, Unpaid Principal Balance, Total	376	34
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	794	1,017
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	866	1,089
Impaired financing receivables, with an allowance recorded, Recorded Investment	245	262
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	249	265
Impaired financing receivables, with an allowance recorded, Related Allowance	98	122
Impaired financing receivables, Recorded Investment, Total	1,039	1,279
Impaired financing receivables, Unpaid Principal Balance, Total	1,115	1,354
Impaired financing receivables, Related Allowance, Total	98	122
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	681	256
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	681	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	681	696
Impaired financing receivables, Unpaid Principal Balance, Total	$ 681	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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