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Loans - Credit Quality (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Loans by risk rating
Total Loans	$ 1,202,852	$ 1,133,715	$ 1,132,912
Commercial
Loans by risk rating
Total Loans	184,034	141,315	129,733
Real estate - commercial
Loans by risk rating
Total Loans	617,280		609,937
Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	127,321	125,504
Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	168,061	171,948
Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	163,175	167,643
Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	105,003	92,387
Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	39,665	34,352
Real estate - commercial | Farm
Loans by risk rating
Total Loans	14,055	13,887
Real estate - residential
Loans by risk rating
Total Loans	357,846		354,106
Real estate - residential | Investor
Loans by risk rating
Total Loans	131,217	126,684
Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	125,578	118,792
Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	101,051	105,531
Consumer
Loans by risk rating
Total Loans	3,325	4,216	4,005
All other
Loans by risk rating
Total Loans	11,581	11,650	11,670
Pass
Loans by risk rating
Total Loans	1,165,452	1,101,886
Pass | Commercial
Loans by risk rating
Total Loans	177,082	136,078
Pass | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	124,359	123,827
Pass | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	165,333	171,185
Pass | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	160,463	163,956
Pass | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	100,191	88,468
Pass | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	36,435	30,432
Pass | Real estate - commercial | Farm
Loans by risk rating
Total Loans	11,014	12,615
Pass | Real estate - residential | Investor
Loans by risk rating
Total Loans	130,046	125,548
Pass | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	119,146	111,713
Pass | Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	97,973	102,476
Pass | Consumer
Loans by risk rating
Total Loans	3,324	4,215
Pass | All other
Loans by risk rating
Total Loans	11,554	11,650
Special Mention
Loans by risk rating
Total Loans	9,141	6,606
Special Mention | Commercial
Loans by risk rating
Total Loans	4,650	3,208
Special Mention | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	645
Special Mention | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	2,330
Special Mention | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	249	1,908
Special Mention | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans		1,490
Special Mention | Real estate - commercial | Farm
Loans by risk rating
Total Loans	1,240
Special Mention | All other
Loans by risk rating
Total Loans	27
Substandard
Loans by risk rating
Total Loans	28,259	25,223
Substandard | Commercial
Loans by risk rating
Total Loans	2,302	2,029
Substandard | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	2,317	1,677
Substandard | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	398	763
Substandard | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	2,463	1,779
Substandard | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	4,812	3,919
Substandard | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	3,230	2,430
Substandard | Real estate - commercial | Farm
Loans by risk rating
Total Loans	1,801	1,272
Substandard | Real estate - residential | Investor
Loans by risk rating
Total Loans	1,171	1,136
Substandard | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	6,432	7,079
Substandard | Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	3,078	3,055
Substandard | Consumer
Loans by risk rating
Total Loans	1	1
Construction Loans | Real estate - commercial
Loans by risk rating
Total Loans	28,786		$ 23,461
Construction Loans | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	612	2,604
Construction Loans | Real estate - commercial | Land
Loans by risk rating
Total Loans	1,237	1,137
Construction Loans | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	8,977	2,200
Construction Loans | Real estate - commercial | All other
Loans by risk rating
Total Loans	17,960	13,865
Construction Loans | Pass | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	612	2,604
Construction Loans | Pass | Real estate - commercial | Land
Loans by risk rating
Total Loans	1,237	1,137
Construction Loans | Pass | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	8,901	2,117
Construction Loans | Pass | Real estate - commercial | All other
Loans by risk rating
Total Loans	17,782	13,865
Construction Loans | Substandard | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	76	$ 83
Construction Loans | Substandard | Real estate - commercial | All other
Loans by risk rating
Total Loans	$ 178

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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