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Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Allowance for loan losses [Roll Forward]
Balance, beginning of period	$ 3,575	$ 3,129
Provision charged to expenses	15	90
Losses charged off	(354)	(118)
Recoveries	92	49
Balance, end of period	3,328	3,150
Commercial and Industrial [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	350	244
Provision charged to expenses	(2)	0
Losses charged off	0	0
Recoveries	5	3
Balance, end of period	353	247
Commercial Secured By Real Estate [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	2,179	1,908
Provision charged to expenses	90	(35)
Losses charged off	(262)	(23)
Recoveries	0	18
Balance, end of period	2,007	1,868
Residential Real Estate [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	885	854
Provision charged to expenses	(107)	66
Losses charged off	(17)	(28)
Recoveries	48	4
Balance, end of period	809	896
Consumer [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	96	54
Provision charged to expenses	23	61
Losses charged off	(45)	(44)
Recoveries	17	10
Balance, end of period	91	81
Agricultural [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	60	66
Provision charged to expenses	6	(10)
Losses charged off	0	0
Recoveries	0	0
Balance, end of period	66	56
Other [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	5	3
Provision charged to expenses	5	8
Losses charged off	(30)	(23)
Recoveries	22	14
Balance, end of period	$ 2	$ 2

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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X

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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