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Loans and Allowance for Loan Losses (Summary of Impaired Loan Balances and Associated Allowance by Portfolio Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment with related allowance recorded | $ 2,841 | $ 4,476 | $ 9,280
Unpaid principal balance with related allowance recorded | 2,841 | 4,476 | 9,280
Average recorded investment with related allowance recorded | 3,933 | 5,921 | 12,257
Interest income recognized with related allowance recorded | 121 | 138 | 153
Recorded investment without related allowance recorded | 1,637 | 2,450 | 4,310
Unpaid principal balance without related allowance recorded | 2,426 | 3,001 | 6,216
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 |
Average recorded investment without related allowance recorded | 1,993 | 5,368 | 4,709
Interest income recognized without related allowance recorded | 41 | 55 | 62
Recorded investment, total impaired loans | 4,478 | 6,926 | 13,590
Unpaid principal balance, total impaired loans | 5,267 | 7,477 | 15,496
Related allowance, total impaired loans | 463 | 824 | 2,009
Average recorded investment, total impaired loans | 5,926 | 11,289 | 16,966
Interest income recognized, total impaired loans | 162 | 193 | 215
Residential real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment with related allowance recorded | 2,395 | 3,471 | 3,858
Unpaid principal balance with related allowance recorded | 2,395 | 3,471 | 3,858
Average recorded investment with related allowance recorded | 2,989 | 3,591 | 3,177
Interest income recognized with related allowance recorded | 110 | 127 | 131
Recorded investment without related allowance recorded | 989 | 1,291 | 1,313
Unpaid principal balance without related allowance recorded | 1,116 | 1,415 | 1,673
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 |
Average recorded investment without related allowance recorded | 1,258 | 1,524 | 1,345
Interest income recognized without related allowance recorded | 21 | 34 | 15
Related allowance, total impaired loans | 364 | 586 | 568
Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment with related allowance recorded | 128 | 131 | 5,422
Unpaid principal balance with related allowance recorded | 128 | 131 | 5,422
Average recorded investment with related allowance recorded | 130 | 1,969 | 8,900
Interest income recognized with related allowance recorded | 11 | 11 | 22
Recorded investment without related allowance recorded | 274 | 799 | 777
Unpaid principal balance without related allowance recorded | 433 | 975 | 1,084
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 |
Average recorded investment without related allowance recorded | 381 | 2,269 | 1,132
Interest income recognized without related allowance recorded | 13 | 13 | 29
Related allowance, total impaired loans | 30 | 23 | 1,441
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 | 31
Recorded investment without related allowance recorded | 319 | 230 | 1,791
Unpaid principal balance without related allowance recorded | 685 | 293 | 2,964
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 |
Average recorded investment without related allowance recorded | 238 | 1,379 | 1,920
Interest income recognized without related allowance recorded | 7 | 8 | 10
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 | 125
Recorded investment without related allowance recorded | 55 | 124 | 429
Unpaid principal balance without related allowance recorded | 192 | 305 | 495
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 |
Average recorded investment without related allowance recorded | 115 | 195 | 310
Interest income recognized without related allowance recorded |  |  | 8
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 | 2
Related allowance, total impaired loans | 0 | 0 |
HPFC Portfolio Segment |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average recorded investment with related allowance recorded |  |  | 24
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 |
Average recorded investment without related allowance recorded |  |  |
Related allowance, total impaired loans | $ 0 | $ 0 |

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