Loans Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	$ 18,586	$ 17,012	$ 16,038
Charge-offs	(1,532)	(1,559)	(1,270)
Recoveries	535	397	211
Provision	2,607	2,736	2,033
Allowance for Credit Losses, Ending Balance	20,196	18,586	17,012
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	4	106
Allowance for Loan Losses - Collectively Evaluated for Impairment	20,192	18,480
Ending Loan Balance - Individually Evaluated for Impairment	3,223	3,683
Ending Loan Balance - Collectively Evaluated for Impairment	2,192,992	1,947,087
Commercial
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	1,873	1,017	1,827
Charge-offs	(153)	(2)	(97)
Recoveries	3	9	23
Provision	(505)	849	(736)
Allowance for Credit Losses, Ending Balance	1,218	1,873	1,017
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	0	94
Allowance for Loan Losses - Collectively Evaluated for Impairment	1,218	1,779
Ending Loan Balance - Individually Evaluated for Impairment	430	489
Ending Loan Balance - Collectively Evaluated for Impairment	136,460	128,760
Commercial Real Estate
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	4,504	5,677	4,520
Charge-offs	(17)	(380)	(195)
Recoveries	12	0	0
Provision	1,145	(793)	1,352
Allowance for Credit Losses, Ending Balance	5,644	4,504	5,677
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	0	2
Allowance for Loan Losses - Collectively Evaluated for Impairment	5,644	4,502
Ending Loan Balance - Individually Evaluated for Impairment	793	1,537
Ending Loan Balance - Collectively Evaluated for Impairment	483,769	442,711
Other Consumer
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	7,604	6,120	5,554
Charge-offs	(1,246)	(1,101)	(871)
Recoveries	520	388	182
Provision	2,004	2,197	1,255
Allowance for Credit Losses, Ending Balance	8,882	7,604	6,120
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	8,882	7,604
Ending Loan Balance - Individually Evaluated for Impairment	101	95
Ending Loan Balance - Collectively Evaluated for Impairment	719,409	602,732
Residential Portfolio Segment
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	4,605	4,198	3,790
Charge-offs	(116)	(76)	(107)
Recoveries	0	0	6
Provision	(37)	483	509
Allowance for Credit Losses, Ending Balance	4,452	4,605	4,198
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses - Individually Evaluated for Impairment	4	10
Allowance for Loan Losses - Collectively Evaluated for Impairment	4,448	4,595
Ending Loan Balance - Individually Evaluated for Impairment	1,899	1,562
Ending Loan Balance - Collectively Evaluated for Impairment	853,354	772,884
Unallocated
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward]
Allowance for Credit Losses, Beginning Balance	0	0	347
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	0	0	(347)
Allowance for Credit Losses, Ending Balance	0	0	$ 0
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	0
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 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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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