Loans and Allowance for Credit Losses (Financing Receivable Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	$ 1,119,937	$ 1,093,514
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	9,264	12,184
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	16,018	17,231
Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	894,313	864,162
Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	200,342	199,937
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	130,455	125,746
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	3,241	6,236
Commercial and Residential Real Estate Portfolio Segment [Member] | Performing [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	95,124	88,836
Commercial and Residential Real Estate Portfolio Segment [Member] | Watch [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	32,090	30,674
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	401,359	399,190
Residential Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	4,106	4,456
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	4,303	4,186
Residential Portfolio Segment [Member] | Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	358,433	355,575
Residential Portfolio Segment [Member] | Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	34,517	34,973
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	477,805	464,887
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	4,855	7,420
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	8,047	6,375
Commercial Real Estate Portfolio Segment [Member] | Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	358,804	342,051
Commercial Real Estate Portfolio Segment [Member] | Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	106,099	109,041
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	104,266	97,284
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	303	308
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	427	434
Commercial Portfolio Segment [Member] | Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	76,772	72,440
Commercial Portfolio Segment [Member] | Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	26,764	24,102
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	6,052	6,407
Consumer Portfolio Segment [Member] | Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	5,180	5,260
Consumer Portfolio Segment [Member] | Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	$ 872	$ 1,147