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Allowance for Loan Losses - Impaired Financing Receivables Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 2,082	$ 1,862
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	2,158	2,158
Impaired financing receivables, with an allowance recorded, Recorded Investment	1,520	1,598
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	1,524	1,602
Impaired financing receivables, with an allowance recorded, Related Allowance	119	125
Impaired financing receivables, Recorded Investment, Total	3,602	3,460
Impaired financing receivables, Unpaid Principal Balance, Total	3,682	3,760
Impaired financing receivables, Related Allowance, Total	119	125
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	571
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	571
Impaired financing receivables, with an allowance recorded, Recorded Investment	390	438
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	390	438
Impaired financing receivables, with an allowance recorded, Related Allowance	5	4
Impaired financing receivables, Recorded Investment, Total	961	438
Impaired financing receivables, Unpaid Principal Balance, Total	961	438
Impaired financing receivables, Related Allowance, Total	5	4
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	207	693
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	207	913
Impaired financing receivables, with an allowance recorded, Recorded Investment	310	317
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	310	317
Impaired financing receivables, with an allowance recorded, Related Allowance	8	6
Impaired financing receivables, Recorded Investment, Total	517	1,010
Impaired financing receivables, Unpaid Principal Balance, Total	517	1,230
Impaired financing receivables, Related Allowance, Total	8	6
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	39	44
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	43	48
Impaired financing receivables, Recorded Investment, Total	39	44
Impaired financing receivables, Unpaid Principal Balance, Total	43	48
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	937	977
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,009	1,049
Impaired financing receivables, with an allowance recorded, Recorded Investment	370	383
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	374	387
Impaired financing receivables, with an allowance recorded, Related Allowance	100	109
Impaired financing receivables, Recorded Investment, Total	1,307	1,360
Impaired financing receivables, Unpaid Principal Balance, Total	1,383	1,436
Impaired financing receivables, Related Allowance, Total	100	109
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	328	148
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	328	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	778	608
Impaired financing receivables, Unpaid Principal Balance, Total	778	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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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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
-Name Accounting Standards Codification
-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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-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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+ References

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

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