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Allowance for Credit Losses (Impaired Loans By Loan Portfolio) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded $ 6,014 $ 8,639
Unpaid Principal Balance, With no related allowance recorded 7,210 9,883
Average Recorded Investment, With no related allowance recorded 7,871 7,445
Interest Income Recognized, With no related allowance recorded 109 24
Recorded Investment, with allowance recorded 1,808 491
Unpaid Principal Balance, With allowance recorded 1,932 591
Average Recorded Investment, With allowance recorded 1,143 928
Interest Income Recognized, With allowance recorded 2
Recorded Investment, Total 7,822 9,130
Unpaid Principal Balance, Total 9,142 10,474
Related Allowance, Total 285 157
Average Recorded Investment, Total 9,014 8,373
Interest Income Recognized, Total 111 24
Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 1,462 1,908
Unpaid Principal Balance, With no related allowance recorded 1,804 2,210
Average Recorded Investment, With no related allowance recorded 1,832 1,540
Interest Income Recognized, With no related allowance recorded 18
Recorded Investment, with allowance recorded 73
Unpaid Principal Balance, With allowance recorded 73
Average Recorded Investment, With allowance recorded 44 333
Interest Income Recognized, With allowance recorded 2
Recorded Investment, Total 1,535 1,908
Unpaid Principal Balance, Total 1,877 2,210
Related Allowance, Total 1
Average Recorded Investment, Total 1,876 1,873
Interest Income Recognized, Total 20
Acquired Residential Mortgage With Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded
Unpaid Principal Balance, With no related allowance recorded
Average Recorded Investment, With no related allowance recorded 1 7
Interest Income Recognized, With no related allowance recorded
Recorded Investment, with allowance recorded 7
Unpaid Principal Balance, With allowance recorded 26
Average Recorded Investment, With allowance recorded 4
Interest Income Recognized, With allowance recorded
Recorded Investment, Total 7
Unpaid Principal Balance, Total 26
Related Allowance, Total 3
Average Recorded Investment, Total 1 11
Interest Income Recognized, Total
Commercial Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 1,532 2,809
Unpaid Principal Balance, With no related allowance recorded 1,780 3,207
Average Recorded Investment, With no related allowance recorded 2,388 2,180
Interest Income Recognized, With no related allowance recorded 49 15
Recorded Investment, with allowance recorded 737 19
Unpaid Principal Balance, With allowance recorded 802 93
Average Recorded Investment, With allowance recorded 208 8
Interest Income Recognized, With allowance recorded
Recorded Investment, Total 2,269 2,828
Unpaid Principal Balance, Total 2,582 3,300
Related Allowance, Total 78 19
Average Recorded Investment, Total 2,596 2,188
Interest Income Recognized, Total 49 15
Acquired Commercial Mortgage With Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 514 936
Unpaid Principal Balance, With no related allowance recorded 527 950
Average Recorded Investment, With no related allowance recorded 656 1,205
Interest Income Recognized, With no related allowance recorded 34
Recorded Investment, with allowance recorded
Unpaid Principal Balance, With allowance recorded
Average Recorded Investment, With allowance recorded
Interest Income Recognized, With allowance recorded
Recorded Investment, Total 514 936
Unpaid Principal Balance, Total 527 950
Related Allowance, Total
Average Recorded Investment, Total 656 1,205
Interest Income Recognized, Total 34
Commercial Term [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 1,343 1,743
Unpaid Principal Balance, With no related allowance recorded 1,845 2,253
Average Recorded Investment, With no related allowance recorded 1,701 1,131
Interest Income Recognized, With no related allowance recorded
Recorded Investment, with allowance recorded 957 337
Unpaid Principal Balance, With allowance recorded 1,015 343
Average Recorded Investment, With allowance recorded 820 325
Interest Income Recognized, With allowance recorded
Recorded Investment, Total 2,300 2,080
Unpaid Principal Balance, Total 2,860 2,596
Related Allowance, Total 203 123
Average Recorded Investment, Total 2,521 1,456
Interest Income Recognized, Total
Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 476 514
Unpaid Principal Balance, With no related allowance recorded 514 514
Average Recorded Investment, With no related allowance recorded 491 690
Interest Income Recognized, With no related allowance recorded
Recorded Investment, with allowance recorded
Unpaid Principal Balance, With allowance recorded
Average Recorded Investment, With allowance recorded 89
Interest Income Recognized, With allowance recorded
Recorded Investment, Total 476 514
Unpaid Principal Balance, Total 514 514
Related Allowance, Total
Average Recorded Investment, Total 491 779
Interest Income Recognized, Total
Consumer: Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 531 612
Unpaid Principal Balance, With no related allowance recorded 535 632
Average Recorded Investment, With no related allowance recorded 633 586
Interest Income Recognized, With no related allowance recorded 7 9
Recorded Investment, with allowance recorded
Unpaid Principal Balance, With allowance recorded
Average Recorded Investment, With allowance recorded
Interest Income Recognized, With allowance recorded
Recorded Investment, Total 531 612
Unpaid Principal Balance, Total 535 632
Related Allowance, Total
Average Recorded Investment, Total 633 586
Interest Income Recognized, Total 7 9
Consumer: Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 156 117
Unpaid Principal Balance, With no related allowance recorded 205 117
Average Recorded Investment, With no related allowance recorded 169 106
Interest Income Recognized, With no related allowance recorded 1
Recorded Investment, with allowance recorded 41 128
Unpaid Principal Balance, With allowance recorded 42 129
Average Recorded Investment, With allowance recorded 71 169
Interest Income Recognized, With allowance recorded
Recorded Investment, Total 197 245
Unpaid Principal Balance, Total 247 246
Related Allowance, Total 3 12
Average Recorded Investment, Total 240 275
Interest Income Recognized, Total $ 1