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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, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	$ 2,009	$ 5,121
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	2,339	6,145
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	2,249	1,418
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	2,803	1,972
Impaired financing receivables, with an allowance recorded, Related Allowance	246	188
Impaired financing receivables, Recorded Investment, Total	4,258	6,539
Impaired financing receivables, Unpaid Principal Balance, Total	5,142	8,117
Impaired financing receivables, Related Allowance, Total	246	188
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment		1,230
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance		1,751
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	1,170	753
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	1,720	1,303
Impaired financing receivables, with an allowance recorded, Related Allowance	122	82
Impaired financing receivables, Recorded Investment, Total	1,170	1,983
Impaired financing receivables, Unpaid Principal Balance, Total	1,720	3,054
Impaired financing receivables, Related Allowance, Total	122	82
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	814	1,658
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,069	1,803
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	225	238
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	225	238
Impaired financing receivables, with an allowance recorded, Related Allowance	4	4
Impaired financing receivables, Recorded Investment, Total	1,039	1,896
Impaired financing receivables, Unpaid Principal Balance, Total	1,294	2,041
Impaired financing receivables, Related Allowance, Total	4	4
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	50	359
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	53	386
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, Recorded Investment, Total	50	359
Impaired financing receivables, Unpaid Principal Balance, Total	53	386
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	996	1,259
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	1,068	1,590
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	390	427
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	394	431
Impaired financing receivables, with an allowance recorded, Related Allowance	114	102
Impaired financing receivables, Recorded Investment, Total	1,386	1,686
Impaired financing receivables, Unpaid Principal Balance, Total	1,462	2,021
Impaired financing receivables, Related Allowance, Total	114	102
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivables, with no related allowance recorded, Recorded Investment	149	614
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance	149	614
Impaired financing receivables, with no related allowance recorded, Related Allowance	0	0
Impaired financing receivables, with an allowance recorded, Recorded Investment	464
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance	464
Impaired financing receivables, with an allowance recorded, Related Allowance	6
Impaired financing receivables, Recorded Investment, Total	613	614
Impaired financing receivables, Unpaid Principal Balance, Total	613	614
Impaired financing receivables, Related Allowance, Total	6
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=84173941&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=84173941&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
-Paragraph 15
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-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-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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-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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