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Loans and Allowance for Credit Losses (Financing Receivable Credit Quality Indicators) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating $ 1,156,884 $ 1,093,514
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 10,056 12,184
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 15,670 17,231
Performing [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 932,220 864,162
Watch [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 198,938 199,937
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 137,318 125,746
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 3,236 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 102,435 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 31,647 30,674
Residential Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 407,278 399,190
Residential Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 3,934 4,456
Residential Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 4,083 4,186
Residential Portfolio Segment [Member] | Performing [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 363,423 355,575
Residential Portfolio Segment [Member] | Watch [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 35,838 34,973
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 497,707 464,887
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 5,474 7,420
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 7,973 6,375
Commercial Real Estate Portfolio Segment [Member] | Performing [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 377,521 342,051
Commercial Real Estate Portfolio Segment [Member] | Watch [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 106,739 109,041
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 108,229 97,284
Commercial Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 648 308
Commercial Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 375 434
Commercial Portfolio Segment [Member] | Performing [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 83,047 72,440
Commercial Portfolio Segment [Member] | Watch [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 24,159 24,102
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating 6,352 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 5,794 5,260
Consumer Portfolio Segment [Member] | Watch [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loan Risk Rating $ 555 $ 1,147