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Allowance for Loan Losses - Schedule of Allowance for Loan Losses on Basis of Calculation Methodology (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | $ 777 |  | $ 906 |
Historical loss rate | 1,054 |  | 422 |
Qualitative factors | 7,577 |  | 5,956 |
Other | 198 |  |  |
Total | 9,606 | $ 8,669 | 7,284 | $ 7,306
Unallocated [Member] |  |  |  |
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | 0 |  | 0 |
Historical loss rate | 0 |  | 0 |
Qualitative factors | 0 |  | 0 |
Other | 198 |  |  |
Total | 198 | 272 | 0 | 152
Residential Mortgage Loans [Member] | 1-4 Family First Lien Residential Mortgages [Member] |  |  |  |
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | 95 |  | 104 |
Historical loss rate | 66 |  | 65 |
Qualitative factors | 570 |  | 553 |
Total | 731 | 580 | 722 | 766
Residential Mortgage Loans [Member] | Residential Construction Mortgage [Member] |  |  |  |
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | 0 |  | 0 |
Historical loss rate | 0 |  | 0 |
Qualitative factors | 0 |  | 0 |
Total | 0 | 0 | 0 | 0
Commercial Loans [Member] | Real Estate [Member] |  |  |  |
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | 76 |  | 98 |
Historical loss rate | 101 |  | 151 |
Qualitative factors | 4,066 |  | 3,121 |
Total | 4,243 | 4,010 | 3,370 | 3,578
Commercial Loans [Member] | Lines of Credit [Member] |  |  |  |
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | 98 |  | 92 |
Historical loss rate | 100 |  | 18 |
Qualitative factors | 1,020 |  | 692 |
Total | 1,218 | 1,195 | 802 | 730
Commercial Loans [Member] | Other Commercial and Industrial [Member] |  |  |  |
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | 379 |  | 464 |
Historical loss rate | 57 |  | 26 |
Qualitative factors | 1,322 |  | 1,070 |
Total | 1,758 | 1,645 | 1,560 | 1,285
Commercial Loans [Member] | Tax Exempt Loans [Member] |  |  |  |
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | 0 |  | 0 |
Historical loss rate | 0 |  | 0 |
Qualitative factors | 1 |  | 1 |
Other | 0 |  |  |
Total | 1 | 1 | 1 | 1
Consumer Loans [Member] | Home Equity and Junior Liens [Member] |  |  |  |
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | 128 |  | 139 |
Historical loss rate | 146 |  | 13 |
Qualitative factors | 337 |  | 278 |
Other | 0 |  |  |
Total | 611 | 553 | 430 | 409
Consumer Loans [Member] | Other Consumer [Member] |  |  |  |
Allowance For Loan Losses On Basis Of Calculation Methodology Abstract |  |  |  |
Specifically reserved | 1 |  | 9 |
Historical loss rate | 584 |  | 149 |
Qualitative factors | 261 |  | 241 |
Other | 0 |  |  |
Total | $ 846 | $ 413 | $ 399 | $ 385

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