Loans Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 20,373	$ 19,057	$ 20,196	$ 18,586
Charge-offs	(368)	(264)	(830)	(634)
Recoveries	235	218	402	313
Provision	455	629	927	1,375
Allowance for Loan Losses, Ending Balance	20,695	19,640	20,695	19,640
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	5	185	5	185	$ 4
Allowance for loan losses - Loans Collectively Evaluated for Impairment	20,690	19,455	20,690	19,455	20,192
Ending Loan Balance - Individually Evaluated for Impairment	2,564	2,492	2,564	2,492	3,223
Ending Loan Balance - Collectively Evaluated for Impairment	2,277,744	2,055,370	2,277,744	2,055,370	2,192,992
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	1,250	1,119	1,218	1,873
Charge-offs	0	0	(1)	(16)
Recoveries	0	0	0	0
Provision	(19)	(175)	14	(913)
Allowance for Loan Losses, Ending Balance	1,231	944	1,231	944
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	5	88	5	88	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	1,226	856	1,226	856	1,218
Ending Loan Balance - Individually Evaluated for Impairment	37	489	37	489	430
Ending Loan Balance - Collectively Evaluated for Impairment	138,294	118,392	138,294	118,392	136,460
Commercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	5,589	5,412	5,644	4,504
Charge-offs	0	0	(29)	0
Recoveries	0	3	0	12
Provision	(130)	423	(156)	1,322
Allowance for Loan Losses, Ending Balance	5,459	5,838	5,459	5,838
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	44	0	44	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	5,459	5,794	5,459	5,794	5,644
Ending Loan Balance - Individually Evaluated for Impairment	1	813	1	813	793
Ending Loan Balance - Collectively Evaluated for Impairment	490,273	463,580	490,273	463,580	483,769
Consumer Loans Financing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	9,409	8,019	8,882	7,604
Charge-offs	(368)	(248)	(786)	(595)
Recoveries	235	215	402	301
Provision	378	351	1,156	1,027
Allowance for Loan Losses, Ending Balance	9,654	8,337	9,654	8,337
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	9,654	8,337	9,654	8,337	8,882
Ending Loan Balance - Individually Evaluated for Impairment	124	110	124	110	101
Ending Loan Balance - Collectively Evaluated for Impairment	778,900	661,798	778,900	661,798	719,409
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	4,125	4,507	4,452	4,605
Charge-offs	0	(16)	(14)	(23)
Recoveries	0	0	0	0
Provision	226	30	(87)	(61)
Allowance for Loan Losses, Ending Balance	4,351	4,521	4,351	4,521
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	53	0	53	4
Allowance for loan losses - Loans Collectively Evaluated for Impairment	4,351	4,468	4,351	4,468	4,448
Ending Loan Balance - Individually Evaluated for Impairment	2,402	1,080	2,402	1,080	1,899
Ending Loan Balance - Collectively Evaluated for Impairment	$ 870,277	$ 811,600	$ 870,277	$ 811,600	$ 853,354

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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

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The balance of financing receivables 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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