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Loan Quality (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Allowance $ 11,551 $ 12,176
Unpaid Principal Balance With No Allowance 12,473 13,484
Recorded Investment With Allowance 5,702  
Unpaid Principal Balance With Allowance 5,702  
Related Allowance 228  
Average Recorded Investment 15,005 14,606
Interest Income Recognized 430 436
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Allowance 637 659
Unpaid Principal Balance With No Allowance 637 659
Average Recorded Investment 648 668
Interest Income Recognized 40 39
Residential Real Estate [Member] | First Liens [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Allowance 637 659
Unpaid Principal Balance With No Allowance 637 659
Average Recorded Investment 648 668
Interest Income Recognized 40 39
Residential Real Estate - Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Allowance 512 523
Unpaid Principal Balance With No Allowance 729 729
Average Recorded Investment 518 619
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Allowance 10,402 10,994
Unpaid Principal Balance With No Allowance 11,107 12,096
Recorded Investment With Allowance 5,702  
Unpaid Principal Balance With Allowance 5,702  
Related Allowance 228  
Average Recorded Investment 13,839 13,319
Interest Income Recognized $ 390 $ 397