Loans and Allowance for Credit Losses (Allowance for Credit Losses on Loans Receivable with Impairment) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 1,047,247	$ 871,525
Allowance for credit losses allocated to:
Loans and leases receivable, allowance, total	9,295	8,726
Commercial and Residential Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	6,986	8,007
Loans collectively evaluated for impairment	99,631	75,995
Total loans	106,617	84,002
Allowance for credit losses allocated to:
Loans individually evaluated for impairment	589	1,639
Loans collectively evaluated for impairment	1,652	1,148
Loans and leases receivable, allowance, total	2,241	2,787
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	7,190	7,778
Loans collectively evaluated for impairment	380,532	317,990
Total loans	387,722	325,768
Allowance for credit losses allocated to:
Loans individually evaluated for impairment	251	317
Loans collectively evaluated for impairment	1,792	1,636
Loans and leases receivable, allowance, total	2,043	1,953
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	5,265	6,088
Loans collectively evaluated for impairment	449,361	376,593
Total loans	454,626	382,681
Allowance for credit losses allocated to:
Loans individually evaluated for impairment	35	185
Loans collectively evaluated for impairment	2,849	2,425
Loans and leases receivable, allowance, total	2,884	2,610
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	341
Loans collectively evaluated for impairment	91,458	72,435
Total loans	91,799	72,435
Allowance for credit losses allocated to:
Loans collectively evaluated for impairment	1,804	1,145
Loans and leases receivable, allowance, total	1,804	1,145
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment		99
Loans collectively evaluated for impairment	6,483	6,540
Total loans	6,483	6,639
Allowance for credit losses allocated to:
Loans collectively evaluated for impairment	323	231
Loans and leases receivable, allowance, total	323	231
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	19,782	21,972
Loans collectively evaluated for impairment	1,027,465	849,553
Total loans	1,047,247	871,525
Allowance for credit losses allocated to:
Loans individually evaluated for impairment	875	2,141
Loans collectively evaluated for impairment	8,420	6,585
Loans and leases receivable, allowance, total	$ 9,295	$ 8,726

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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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