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Loans and Allowance for Credit Losses on Loans (Summary of Impaired Loan Balances and Associated Allowance by Portfolio Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Recorded investment with related allowance recorded | $ 2,841 | $ 4,476
Unpaid principal balance with related allowance recorded | 2,841 | 4,476
Average recorded investment with related allowance recorded | 3,933 | 5,921
Interest income recognized with related allowance recorded | 121 | 138
Recorded investment without related allowance recorded | 1,637 | 2,450
Unpaid principal balance without related allowance recorded | 2,426 | 3,001
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0
Average recorded investment without related allowance recorded | 1,993 | 5,368
Interest income recognized without related allowance recorded | 41 | 55
Recorded investment, total impaired loans | 4,478 | 6,926
Unpaid principal balance, total impaired loans | 5,267 | 7,477
Related allowance, total impaired loans | 463 | 824
Average recorded investment, total impaired loans | 5,926 | 11,289
Interest income recognized, total impaired loans | 162 | 193
Residential real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment with related allowance recorded | 2,395 | 3,471
Unpaid principal balance with related allowance recorded | 2,395 | 3,471
Average recorded investment with related allowance recorded | 2,989 | 3,591
Interest income recognized with related allowance recorded | 110 | 127
Recorded investment without related allowance recorded | 989 | 1,291
Unpaid principal balance without related allowance recorded | 1,116 | 1,415
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0
Average recorded investment without related allowance recorded | 1,258 | 1,524
Interest income recognized without related allowance recorded | 21 | 34
Related allowance, total impaired loans | 364 | 586
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment with related allowance recorded | 128 | 131
Unpaid principal balance with related allowance recorded | 128 | 131
Average recorded investment with related allowance recorded | 130 | 1,969
Interest income recognized with related allowance recorded | 11 | 11
Recorded investment without related allowance recorded | 274 | 799
Unpaid principal balance without related allowance recorded | 433 | 975
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0
Average recorded investment without related allowance recorded | 381 | 2,269
Interest income recognized without related allowance recorded | 13 | 13
Related allowance, total impaired loans | 30 | 23
Commercial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment with related allowance recorded |  | 556
Unpaid principal balance with related allowance recorded |  | 556
Average recorded investment with related allowance recorded | 292 | 111
Recorded investment without related allowance recorded | 319 | 230
Unpaid principal balance without related allowance recorded | 685 | 293
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0
Average recorded investment without related allowance recorded | 238 | 1,379
Interest income recognized without related allowance recorded | 7 | 8
Related allowance, total impaired loans | 0 | 53
Home equity |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment with related allowance recorded | 318 | 318
Unpaid principal balance with related allowance recorded | 318 | 318
Average recorded investment with related allowance recorded | 522 | 250
Recorded investment without related allowance recorded | 55 | 124
Unpaid principal balance without related allowance recorded | 192 | 305
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0
Average recorded investment without related allowance recorded | 115 | 195
Related allowance, total impaired loans | 69 | 162
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without related allowance recorded |  | 6
Unpaid principal balance without related allowance recorded |  | 13
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0
Average recorded investment without related allowance recorded | 1 | 1
Related allowance, total impaired loans | $ 0 | $ 0

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