Loans and Allowance for Credit Losses (Financing Receivable Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	$ 1,047,247	$ 871,525
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	1,009,761	826,197
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	16,076	22,637
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	21,410	22,691
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	106,617	84,002
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	97,304	72,641
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	3,127	4,195
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	6,186	7,166
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	387,722	325,768
Residential Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	376,600	312,242
Residential Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	5,509	6,646
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	5,613	6,880
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	454,626	382,681
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	438,694	363,461
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	6,780	10,939
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	9,152	8,281
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	91,799	72,435
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	90,680	71,313
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	660	857
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	459	265
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	6,483	6,639
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	$ 6,483	6,540
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating		$ 99