Loans Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	$ 16,038	$ 15,570	$ 14,434
Charge-offs	(1,270)	(1,106)	(1,021)
Recoveries	211	227	309
Provision	2,033	1,347	1,848
Allowance for Credit Losses, Ending Balance	17,012	16,038	15,570
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	0	0
Allowance for Loan Losses - Collectively Evaluated for Impairment	17,012	16,038
Ending Loan Balance - Individually Evaluated for Impairment	2,079	3,286
Ending Loan Balance - Collectively Evaluated for Impairment	1,751,189	1,570,666
Commercial [Member]
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	1,827	2,100	1,886
Charge-offs	(97)	(62)	(212)
Recoveries	23	34	86
Provision	(736)	(245)	340
Allowance for Credit Losses, Ending Balance	1,017	1,827	2,100
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	0	0
Allowance for Loan Losses - Collectively Evaluated for Impairment	1,017	1,827
Ending Loan Balance - Individually Evaluated for Impairment	0	155
Ending Loan Balance - Collectively Evaluated for Impairment	105,155	102,432
Commercial Real Estate [Member]
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	4,520	4,128	3,962
Charge-offs	(195)	(7)	0
Recoveries	0	0	0
Provision	1,352	399	166
Allowance for Credit Losses, Ending Balance	5,677	4,520	4,128
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	0	0
Allowance for Loan Losses - Collectively Evaluated for Impairment	5,677	4,520
Ending Loan Balance - Individually Evaluated for Impairment	890	2,372
Ending Loan Balance - Collectively Evaluated for Impairment	430,756	382,567
Other Consumer [Member]
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	5,554	5,210	4,478
Charge-offs	(871)	(711)	(718)
Recoveries	182	193	223
Provision	1,255	862	1,227
Allowance for Credit Losses, Ending Balance	6,120	5,554	5,210
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	0	0
Allowance for Loan Losses - Collectively Evaluated for Impairment	6,120	5,554
Ending Loan Balance - Individually Evaluated for Impairment	91	114
Ending Loan Balance - Collectively Evaluated for Impairment	537,270	464,409
Residential Portfolio Segment [Member]
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	3,790	3,369	3,026
Charge-offs	(107)	(326)	(91)
Recoveries	6	0	0
Provision	509	747	434
Allowance for Credit Losses, Ending Balance	4,198	3,790	3,369
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	0	0
Allowance for Loan Losses - Collectively Evaluated for Impairment	4,198	3,790
Ending Loan Balance - Individually Evaluated for Impairment	1,098	645
Ending Loan Balance - Collectively Evaluated for Impairment	678,008	621,258
Unallocated [Member]
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	347	763	1,082
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(347)	(416)	(319)
Allowance for Credit Losses, Ending Balance	0	347	$ 763
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	0	0
Allowance for Loan Losses - Collectively Evaluated for Impairment	0	347
Ending Loan Balance - Individually Evaluated for Impairment	0	0
Ending Loan Balance - Collectively Evaluated for Impairment	$ 0	$ 0

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

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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

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

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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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