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Allowance for Loan Losses - Impaired Financing Receivables Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 4,122	$ 5,121
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	4,383	6,145
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	2,104	1,418
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	2,658	1,972
Impaired financing receivables, with an allowance recorded, Related Allowance	439	188
Impaired financing receivables, Recorded Investment, Total	6,226	6,539
Impaired financing receivables, Unpaid Principal Balance, Total	7,041	8,117
Impaired financing receivables, Related Allowance, Total	439	188
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	979	1,230
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	979	1,751
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	743	753
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	1,293	1,303
Impaired financing receivables, with an allowance recorded, Related Allowance	243	82
Impaired financing receivables, Recorded Investment, Total	1,722	1,983
Impaired financing receivables, Unpaid Principal Balance, Total	2,272	3,054
Impaired financing receivables, Related Allowance, Total	243	82
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	953	1,658
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	988	1,803
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	922	238
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	922	238
Impaired financing receivables, with an allowance recorded, Related Allowance	81	4
Impaired financing receivables, Recorded Investment, Total	1,875	1,896
Impaired financing receivables, Unpaid Principal Balance, Total	1,910	2,041
Impaired financing receivables, Related Allowance, Total	81	4
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	358	359
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	385	386
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, Recorded Investment, Total	358	359
Impaired financing receivables, Unpaid Principal Balance, Total	385	386
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	1,218	1,259
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,417	1,590
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	439	427
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	443	431
Impaired financing receivables, with an allowance recorded, Related Allowance	115	102
Impaired financing receivables, Recorded Investment, Total	1,657	1,686
Impaired financing receivables, Unpaid Principal Balance, Total	1,860	2,021
Impaired financing receivables, Related Allowance, Total	115	102
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	614	614
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	614	614
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, Recorded Investment, Total	614	614
Impaired financing receivables, Unpaid Principal Balance, Total	614	614
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment		1
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance		1
Impaired financing receivables, with no related allowance recorded, Related Allowance	$ 0	0
Impaired financing receivables, Recorded Investment, Total		1
Impaired financing receivables, Unpaid Principal Balance, Total		$ 1

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+ 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=66008989&loc=SL6953550-111524

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+ References

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
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&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
-SubTopic 10
-Section 50
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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+ References

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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-Publisher FASB
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-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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