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Loans Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Satisfactory      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss $ 606,992 $ 586,452 $ 559,331
Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 2,591 0 5,949
Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 30,635 34,211 31,147
Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 0 789 807
Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 1,691,335 1,570,571 1,525,879
Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 4,038 4,192 2,987
Commercial | Satisfactory      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 135,355 129,584 119,217
Commercial | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 107 0 5,949
Commercial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 6,673 7,306 1,946
Commercial | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 0 0 0
Commercial Real Estate Portfolio Segment | Satisfactory      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 471,637 456,868 440,114
Commercial Real Estate Portfolio Segment | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 2,484 0 0
Commercial Real Estate Portfolio Segment | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 23,962 26,905 29,201
Commercial Real Estate Portfolio Segment | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 0 789 807
Consumer Loans Financing | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 805,147 718,708 693,648
Consumer Loans Financing | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 650 802 540
Residential | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 886,188 851,863 832,231
Residential | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss $ 3,388 $ 3,390 $ 2,447