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Loan Quality and Allowance for Loan Losses (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance $ 15,160   $ 11,926
Unpaid Principal Balance With No Allowance 15,830   22,109
Average Recorded Investment 15,213 $ 12,450  
Interest Income Recognized 113 116  
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 933   920
Unpaid Principal Balance With No Allowance 933   1,007
Average Recorded Investment 937 805  
Interest Income Recognized 11 11  
Residential Real Estate [Member] | First Liens [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 889   871
Unpaid Principal Balance With No Allowance 889   958
Average Recorded Investment 893 805  
Interest Income Recognized 11 11  
Residential Real Estate [Member] | Junior Liens & Lines Of Credit [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 44   49
Unpaid Principal Balance With No Allowance 44   49
Average Recorded Investment 44    
Residential Real Estate - Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 652   455
Unpaid Principal Balance With No Allowance 729   531
Average Recorded Investment 653 466  
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 13,446   10,236
Unpaid Principal Balance With No Allowance 14,022   10,808
Average Recorded Investment 13,494 10,994  
Interest Income Recognized 102 105  
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 129   315
Unpaid Principal Balance With No Allowance 146   $ 9,763
Average Recorded Investment $ 129 $ 185