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Loans Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss    
Satisfactory      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 637,461 $ 628,550 $ 591,134
Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 283 295 2,401
Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 35,486 32,356 33,128
Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 0 0 0
Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 1,737,334 1,721,068 1,604,001
Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 3,629 3,851 4,544
Commercial | Satisfactory      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 140,218 144,283 125,918
Commercial | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 28 32 133
Commercial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 6,854 6,345 7,225
Commercial | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 0 0 0
Commercial Real Estate | Satisfactory      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 497,243 484,267 465,216
Commercial Real Estate | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 255 263 2,268
Commercial Real Estate | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 28,632 26,011 25,903
Commercial Real Estate | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 0 0 0
Consumer | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 823,901 810,535 746,211
Consumer | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 808 663 588
Residential | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss 913,433 910,533 857,790
Residential | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, after Allowance for Credit Loss $ 2,821 $ 3,188 $ 3,956