Loans and Allowance for Credit Losses (Financing Receivable Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	$ 1,180,557	$ 1,093,514
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	9,682	12,184
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	15,119	17,231
Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	949,119	864,162
Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	206,637	199,937
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	126,313	125,746
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	3,069	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	92,937	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	30,307	30,674
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	425,842	399,190
Residential Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	3,433	4,456
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	4,336	4,186
Residential Portfolio Segment [Member] | Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	382,280	355,575
Residential Portfolio Segment [Member] | Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	35,793	34,973
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	513,169	464,887
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	5,604	7,420
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	7,347	6,375
Commercial Real Estate Portfolio Segment [Member] | Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	384,759	342,051
Commercial Real Estate Portfolio Segment [Member] | Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	115,459	109,041
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	108,823	97,284
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	645	308
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	364	434
Commercial Portfolio Segment [Member] | Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	83,245	72,440
Commercial Portfolio Segment [Member] | Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	24,569	24,102
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	6,410	6,407
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	3
Consumer Portfolio Segment [Member] | Performing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	5,898	5,260
Consumer Portfolio Segment [Member] | Watch [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan Risk Rating	$ 509	$ 1,147