Investment Securities - Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings on both taxable and tax-exempt investment securities
Total	$ 7,311	$ 7,238	$ 5,476
Obligations of U.S. government agencies
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities	645	348	106
Mortgage backed securities
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities	3,675	4,433	3,441
State and municipal securities
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities	527	85	5
Earnings on investment securities exempt from federal taxation	2,317	2,013	1,497
Corporate debt securities
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities		6
Asset backed securities
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities	$ 147	$ 353	$ 427

Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.2)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24721-111560

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 2
-Article 9

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