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Allowance for Loan Losses - Impaired Financing Receivables - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 8,615	$ 5,738
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	9,840	6,823
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	804	1,747
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	845	1,705
Impaired financing receivables, with an allowance recorded, Related Allowance	190	386
Impaired financing receivables, Recorded Investment, Total	9,419	7,485
Impaired financing receivables, Unpaid Principal Balance, Total	10,685	8,528
Impaired financing receivables, Related Allowance, Total	190	386
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	2,521	851
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	3,071	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	22	23
Impaired financing receivables, with an allowance recorded, Related Allowance		23
Impaired financing receivables, Recorded Investment, Total	2,521	873
Impaired financing receivables, Unpaid Principal Balance, Total	3,093	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	1,399	1,224
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,434	1,343
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	251	917
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	251	999
Impaired financing receivables, with an allowance recorded, Related Allowance	4	103
Impaired financing receivables, Recorded Investment, Total	1,650	2,141
Impaired financing receivables, Unpaid Principal Balance, Total	1,685	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	1,921	1,742
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,924	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	1,982	1,742
Impaired financing receivables, Unpaid Principal Balance, Total	1,985	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	1,373	965
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	2,010	1,591
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	492	808
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	511	683
Impaired financing receivables, with an allowance recorded, Related Allowance	163	260
Impaired financing receivables, Recorded Investment, Total	1,865	1,773
Impaired financing receivables, Unpaid Principal Balance, Total	2,521	2,274
Impaired financing receivables, Related Allowance, Total	163	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	3	3
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	3	3
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, Recorded Investment, Total	3	3
Impaired financing receivables, Unpaid Principal Balance, Total	$ 3	$ 3

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Impaired financing receivable with and no related allowance.

+ 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://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=49124121&loc=SL6953550-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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-Publisher FASB
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-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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+ References

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-Publisher FASB
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-Section 50
-Paragraph 14A
-Subparagraph (b)
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-Paragraph 15
-Subparagraph (a)(4)
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