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Allowance for Loan Losses - Impaired Financing Receivables Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 2,101	$ 1,862
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	2,176	2,158
Impaired financing receivables, with an allowance recorded, Recorded Investment	1,852	1,598
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	1,856	1,602
Impaired financing receivables, with an allowance recorded, Related Allowance	366	125
Impaired financing receivables, Recorded Investment, Total	3,953	3,460
Impaired financing receivables, Unpaid Principal Balance, Total	4,032	3,760
Impaired financing receivables, Related Allowance, Total	366	125
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	390
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	390
Impaired financing receivables, with an allowance recorded, Recorded Investment		438
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance		438
Impaired financing receivables, with an allowance recorded, Related Allowance		4
Impaired financing receivables, Recorded Investment, Total	390	438
Impaired financing receivables, Unpaid Principal Balance, Total	390	438
Impaired financing receivables, Related Allowance, Total		4
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	198	693
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	198	913
Impaired financing receivables, with an allowance recorded, Recorded Investment	307	317
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	307	317
Impaired financing receivables, with an allowance recorded, Related Allowance	10	6
Impaired financing receivables, Recorded Investment, Total	505	1,010
Impaired financing receivables, Unpaid Principal Balance, Total	505	1,230
Impaired financing receivables, Related Allowance, Total	10	6
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	36	44
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	39	48
Impaired financing receivables, Recorded Investment, Total	36	44
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	1,220	977
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,292	1,049
Impaired financing receivables, with an allowance recorded, Recorded Investment	1,095	383
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	1,099	387
Impaired financing receivables, with an allowance recorded, Related Allowance	350	109
Impaired financing receivables, Recorded Investment, Total	2,315	1,360
Impaired financing receivables, Unpaid Principal Balance, Total	2,391	1,436
Impaired financing receivables, Related Allowance, Total	350	109
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	257	148
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	257	148
Impaired financing receivables, with an allowance recorded, Recorded Investment	450	460
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	450	460
Impaired financing receivables, with an allowance recorded, Related Allowance	6	6
Impaired financing receivables, Recorded Investment, Total	707	608
Impaired financing receivables, Unpaid Principal Balance, Total	707	608
Impaired financing receivables, Related Allowance, Total	$ 6	$ 6

X

- Definition

Impaired financing receivable with and no related allowance.

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

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-Publisher FASB
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-Topic 310
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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 15
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+ References

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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-Section 50
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