Loans and Allowance for Credit Losses (Allowance for Credit Losses on Loans Receivable with Impairment) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 1,119,937	$ 1,093,514
Allowance for credit losses allocated to:
Loans and leases receivable, allowance, total	9,918	9,781
Commercial and Residential Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	3,977	6,975
Loans collectively evaluated for impairment	126,478	118,771
Total loans	130,455	125,746
Allowance for credit losses allocated to:
Loans individually evaluated for impairment	469	500
Loans collectively evaluated for impairment	2,072	1,960
Loans and leases receivable, allowance, total	2,541	2,460
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	5,969	6,018
Loans collectively evaluated for impairment	395,390	393,172
Total loans	401,359	399,190
Allowance for credit losses allocated to:
Loans individually evaluated for impairment	237	239
Loans collectively evaluated for impairment	2,122	2,045
Loans and leases receivable, allowance, total	2,359	2,284
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	6,426	4,967
Loans collectively evaluated for impairment	471,379	459,920
Total loans	477,805	464,887
Allowance for credit losses allocated to:
Loans individually evaluated for impairment	36	33
Loans collectively evaluated for impairment	2,607	2,561
Loans and leases receivable, allowance, total	2,643	2,594
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	363	337
Loans collectively evaluated for impairment	103,903	96,947
Total loans	104,266	97,284
Allowance for credit losses allocated to:
Loans individually evaluated for impairment	59	33
Loans collectively evaluated for impairment	2,099	2,208
Loans and leases receivable, allowance, total	2,158	2,241
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans collectively evaluated for impairment	6,052	6,407
Total loans	6,052	6,407
Allowance for credit losses allocated to:
Loans collectively evaluated for impairment	217	202
Loans and leases receivable, allowance, total	217	202
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	16,735	18,297
Loans collectively evaluated for impairment	1,103,202	1,075,217
Total loans	1,119,937	1,093,514
Allowance for credit losses allocated to:
Loans individually evaluated for impairment	801	805
Loans collectively evaluated for impairment	9,117	8,976
Loans and leases receivable, allowance, total	$ 9,918	$ 9,781

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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