Loans - Analysis of Activity in Allowance for Loan Loss (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 8,904	$ 8,591	$ 8,591
Charge-offs	(55)	(515)
Recoveries	95	598
Provision	0	300
Ending balance	8,944	8,974	8,904
Commercial Loan Portfolio \| Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,231	648	648
Charge-offs	0	0
Recoveries	32	44
Provision	233	60
Ending balance	1,496	752	1,231
Commercial Loan Portfolio \| Agriculture & AG RE
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	120	97	97
Charge-offs	0	0
Recoveries	0	54
Provision	(32)	(32)
Ending balance	88	119	120
Commercial Loan Portfolio \| Construction, Land & Development
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	645	523	523
Charge-offs	0	0
Recoveries	4	19
Provision	(77)	(26)
Ending balance	572	516	645
Commercial Loan Portfolio \| Commercial RE
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	5,168	5,681	5,681
Charge-offs	0	(503)
Recoveries	54	445
Provision	(442)	(82)
Ending balance	4,780	5,541	5,168
Retail Residential Loan Portfolio \| 1-4 Family Residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,736	1,628	1,628
Charge-offs	(55)	(9)
Recoveries	5	36
Provision	320	387
Ending balance	2,006	2,042	1,736
Retail Residential Loan Portfolio \| Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4	14	14
Charge-offs	0	(3)
Recoveries	0	0
Provision	(2)	(7)
Ending balance	$ 2	$ 4	$ 4

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

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- Definition

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

+ References

+ Details

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- 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.

+ Details

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- Definition

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

+ References

+ Details

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- 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

+ Details

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