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Loans and Allowance for Credit Losses (Aging of Past Due Financing Receivables) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 1,037,011 $ 852,410
Total past due 3,947 10,143
Nonaccrual 6,289 8,972
Total loans $ 1,047,247 $ 871,525
Percent of total loans, Current 99.00% 97.80%
Percent of total loans, Total past due 0.40% 1.20%
Percent of total loans, Nonaccrual 0.60% 1.00%
Percent of total loans, Total loans 100.00% 100.00%
Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 3,239 $ 5,029
Percent of total loans, Total past due 0.30% 0.60%
Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 703 $ 5,094
Percent of total loans, Total past due 0.10% 0.60%
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 5 $ 20
Residential Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 383,913 317,992
Total past due 1,244 3,873
Nonaccrual 2,565 3,903
Total loans 387,722 325,768
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 572 1,778
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 667 2,095
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 5  
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 451,789 375,552
Total past due 2,407 5,977
Nonaccrual 430 1,152
Total loans 454,626 382,681
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 2,407 3,219
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   2,758
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 91,225 72,272
Total past due 233 163
Nonaccrual 341  
Total loans 91,799 72,435
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 202 19
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 31 134
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   10
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 6,478 6,515
Total past due 5 25
Nonaccrual   99
Total loans 6,483 6,639
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   13
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 5 2
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   10
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 103,606 80,079
Total past due 58 105
Nonaccrual 2,953 3,818
Total loans 106,617 84,002
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 58  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   $ 105