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Allowance For Loan Losses And Credit Quality Of Financing Receivables - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Recorded Investment, Total $ 6,035   $ 6,597
Unpaid Principal Balance, Total 6,334   6,713
Related Allowance 38   155
Average Recorded Investment, With no related allowance recorded 3,852 $ 3,527  
Average Recorded Investment, With an allowance recorded 2,465 3,216  
Total average recorded investment 6,317 6,743  
Interest Income Recognized, With no related allowance recorded 1 9  
Interest Income Recognized, With an allowance recorded 8 8  
Total interest income recognized 9 17  
Commercial And Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 19   19
Recorded Investment, With an allowance recorded 0   14
Recorded Investment, Total 19   33
Unpaid Principal Balance, With no related allowance recorded 19   19
Unpaid Principal Balance, With an allowance recorded 0   14
Unpaid Principal Balance, Total 19   33
Related Allowance 0   14
Average Recorded Investment, With no related allowance recorded 19 20  
Average Recorded Investment, With an allowance recorded 7 0  
Interest Income Recognized, With no related allowance recorded 0 0  
Interest Income Recognized, With an allowance recorded 0 0  
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 2,292   2,324
Recorded Investment, With an allowance recorded 2,010   2,273
Recorded Investment, Total 4,302   4,597
Unpaid Principal Balance, With no related allowance recorded 2,292   2,324
Unpaid Principal Balance, With an allowance recorded 2,270   2,364
Unpaid Principal Balance, Total 4,562   4,688
Related Allowance 31   135
Average Recorded Investment, With no related allowance recorded 2,308 2,446  
Average Recorded Investment, With an allowance recorded 2,142 2,699  
Interest Income Recognized, With no related allowance recorded 0 8  
Interest Income Recognized, With an allowance recorded 8 8  
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 1,446   1,604
Recorded Investment, With an allowance recorded 268   363
Recorded Investment, Total 1,714   1,967
Unpaid Principal Balance, With no related allowance recorded 1,446   1,629
Unpaid Principal Balance, With an allowance recorded 307   363
Unpaid Principal Balance, Total 1,753   1,992
Related Allowance 7   $ 6
Average Recorded Investment, With no related allowance recorded 1,525 1,061  
Average Recorded Investment, With an allowance recorded 316 379  
Interest Income Recognized, With no related allowance recorded 1 1  
Interest Income Recognized, With an allowance recorded 0 0  
Consumer And Other [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, With an allowance recorded 0 138  
Interest Income Recognized, With an allowance recorded $ 0 $ 0