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Allowance for Credit Losses (Impaired Loans By Loan Portfolio) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Recorded Investment, With no related allowance recorded $ 8,409   $ 8,409   $ 6,732
Unpaid Principal Balance, With no related allowance recorded 11,778   11,778   7,237
Average Recorded Investment, With no related allowance recorded 7,748 $ 5,676 7,146 $ 5,076  
Interest Income Recognized, With no related allowance recorded 6 1 10 3  
Recorded Investment, with allowance recorded 367   367   1,872
Unpaid Principal Balance, With allowance recorded 441   441   4,539
Related Allowance 95   95   334
Average Recorded Investment, With allowance recorded 407 1,620 1,038 1,108  
Recorded Investment, Total 8,776   8,776   8,604
Unpaid Principal Balance, Total 12,219   12,219   11,776
Average Recorded Investment, Total 8,155 7,296 8,184 6,184  
Interest Income Recognized, Total 6 1 10 3  
Residential Mortgage [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment, With no related allowance recorded 1,921   1,921   653
Unpaid Principal Balance, With no related allowance recorded 2,220   2,220   680
Average Recorded Investment, With no related allowance recorded 1,758 880 1,448 1,254  
Recorded Investment, with allowance recorded 138   138   1,107
Unpaid Principal Balance, With allowance recorded 138   138   1,368
Related Allowance 38   38   143
Average Recorded Investment, With allowance recorded 174 886 416 479  
Recorded Investment, Total 2,059   2,059   1,760
Unpaid Principal Balance, Total 2,358   2,358   2,048
Average Recorded Investment, Total 1,932 1,766 1,864 1,733  
Acquired Residential Mortgage With Credit Deterioration [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment, With no related allowance recorded         11
Unpaid Principal Balance, With no related allowance recorded         11
Average Recorded Investment, With no related allowance recorded 6   8    
Recorded Investment, with allowance recorded 11   11    
Unpaid Principal Balance, With allowance recorded 11   11    
Related Allowance 7   7    
Average Recorded Investment, With allowance recorded 6   3    
Recorded Investment, Total 11   11   11
Unpaid Principal Balance, Total 11   11   11
Average Recorded Investment, Total 12   11    
Commercial Mortgage [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment, With no related allowance recorded 2,666   2,666   2,919
Unpaid Principal Balance, With no related allowance recorded 2,894   2,894   3,330
Average Recorded Investment, With no related allowance recorded 2,210 3,101 2,023 2,102  
Interest Income Recognized, With no related allowance recorded 3   3    
Recorded Investment, with allowance recorded 22   22    
Unpaid Principal Balance, With allowance recorded 96   96    
Related Allowance 22   22    
Average Recorded Investment, With allowance recorded 11   6    
Recorded Investment, Total 2,688   2,688   2,919
Unpaid Principal Balance, Total 2,990   2,990   3,330
Average Recorded Investment, Total 2,221 3,101 2,029 2,102  
Interest Income Recognized, Total 3   3    
Acquired Commercial Mortgage With Credit Deterioration [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment, With no related allowance recorded 1,141   1,141   1,674
Unpaid Principal Balance, With no related allowance recorded 1,141   1,141   1,680
Average Recorded Investment, With no related allowance recorded 1,141   1,272    
Recorded Investment, Total 1,141   1,141   1,674
Unpaid Principal Balance, Total 1,141   1,141   1,680
Average Recorded Investment, Total 1,141   1,272    
Commercial Term [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment, With no related allowance recorded 1,506   1,506   22
Unpaid Principal Balance, With no related allowance recorded 1,943   1,943   24
Average Recorded Investment, With no related allowance recorded 1,508 24 978 18  
Recorded Investment, with allowance recorded         176
Unpaid Principal Balance, With allowance recorded         196
Related Allowance         97
Average Recorded Investment, With allowance recorded   181 322 187  
Recorded Investment, Total 1,506   1,506   198
Unpaid Principal Balance, Total 1,943   1,943   220
Average Recorded Investment, Total 1,508 205 1,300 205  
Commercial Construction [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment, With no related allowance recorded 447   447   795
Unpaid Principal Balance, With no related allowance recorded 2,833   2,833   795
Average Recorded Investment, With no related allowance recorded 447 924 734 944  
Recorded Investment, with allowance recorded         447
Unpaid Principal Balance, With allowance recorded         2,833
Related Allowance         89
Average Recorded Investment, With allowance recorded   447 112 335  
Recorded Investment, Total 447   447   1,242
Unpaid Principal Balance, Total 2,833   2,833   3,628
Average Recorded Investment, Total 447 1,371 846 1,279  
Consumer: Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment, With no related allowance recorded 616   616   544
Unpaid Principal Balance, With no related allowance recorded 635   635   595
Average Recorded Investment, With no related allowance recorded 584 631 580 657  
Interest Income Recognized, With no related allowance recorded 3 1 7 3  
Recorded Investment, Total 616   616   544
Unpaid Principal Balance, Total 635   635   595
Average Recorded Investment, Total 584 631 580 657  
Interest Income Recognized, Total 3 1 7 3  
Consumer: Other [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment, With no related allowance recorded 112   112   114
Unpaid Principal Balance, With no related allowance recorded 112   112   122
Average Recorded Investment, With no related allowance recorded 94 116 103 101  
Recorded Investment, with allowance recorded 196   196   142
Unpaid Principal Balance, With allowance recorded 196   196   142
Related Allowance 28   28   5
Average Recorded Investment, With allowance recorded 216 106 179 107  
Recorded Investment, Total 308   308   256
Unpaid Principal Balance, Total 308   308   $ 264
Average Recorded Investment, Total $ 310 $ 222 $ 282 $ 208