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Allowance for Loan Losses - Impaired Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 7,191	$ 5,738
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	8,316	6,823
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	870	1,747
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	889	1,705
Impaired financing receivables, with an allowance recorded, Related Allowance	189	386
Impaired financing receivables, Recorded Investment, Total	8,061	7,485
Impaired financing receivables, Unpaid Principal Balance, Total	9,205	8,528
Impaired financing receivables, Related Allowance, Total	189	386
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	2,417	851
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	2,966	1,034
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment		22
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance		23
Impaired financing receivables, with an allowance recorded, Related Allowance		23
Impaired financing receivables, Recorded Investment, Total	2,417	873
Impaired financing receivables, Unpaid Principal Balance, Total	2,966	1,057
Impaired financing receivables, Related Allowance, Total		23
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	1,363	1,224
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,398	1,343
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	246	917
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	246	999
Impaired financing receivables, with an allowance recorded, Related Allowance	4	103
Impaired financing receivables, Recorded Investment, Total	1,609	2,141
Impaired financing receivables, Unpaid Principal Balance, Total	1,644	2,342
Impaired financing receivables, Related Allowance, Total	4	103
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	683	1,742
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	687	1,826
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	61
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	61
Impaired financing receivables, with an allowance recorded, Related Allowance	23
Impaired financing receivables, Recorded Investment, Total	744	1,742
Impaired financing receivables, Unpaid Principal Balance, Total	748	1,826
Impaired financing receivables, Related Allowance, Total	23
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	1,328	965
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,865	1,591
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	563	808
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	582	683
Impaired financing receivables, with an allowance recorded, Related Allowance	162	260
Impaired financing receivables, Recorded Investment, Total	1,891	1,773
Impaired financing receivables, Unpaid Principal Balance, Total	2,447	2,274
Impaired financing receivables, Related Allowance, Total	162	260
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	1,398	953
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,398	1,026
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, Recorded Investment, Total	1,398	953
Impaired financing receivables, Unpaid Principal Balance, Total	1,398	1,026
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	2	3
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	2	3
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, Recorded Investment, Total	2	3
Impaired financing receivables, Unpaid Principal Balance, Total	$ 2	$ 3

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Publisher FASB
-Name Accounting Standards Codification
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