Loans and Allowance for Loan Losses - Primary Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Primary segments of the loan portfolio:
Individually evaluated for impairment	$ 14,751		$ 12,428
Collectively evaluated for impairment	1,141,822		1,063,440
Total Loans	1,156,573	$ 1,105,306	1,075,868
Commercial
Primary segments of the loan portfolio:
Individually evaluated for impairment	12,957		10,300
Collectively evaluated for impairment	811,668		742,031
Total Loans	824,625	783,909	752,331
Residential
Primary segments of the loan portfolio:
Individually evaluated for impairment	1,707		1,356
Collectively evaluated for impairment	258,806		243,250
Total Loans	260,513	246,214	244,606
Home Equity
Primary segments of the loan portfolio:
Individually evaluated for impairment	44		647
Collectively evaluated for impairment	59,482		64,523
Total Loans	59,526	62,400	65,170
Consumer
Primary segments of the loan portfolio:
Individually evaluated for impairment	43		125
Collectively evaluated for impairment	11,866		13,636
Total Loans	$ 11,909	$ 12,783	$ 13,761

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ 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 (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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The balance of financing receivables that were individually evaluated for impairment.

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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=82891408&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=84173941&loc=d3e5074-111524

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