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Fair Value Measurements - Mortgage Servicing Rights - Other (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value Measurements |  |  |  |  |
Impaired loans with a specific allowance | $ 5,618,000 |  | $ 5,618,000 |  | $ 6,385,000
Specific allowance related to impaired loans | 708,000 |  | 708,000 |  | $ 1,194,000
Collateral dependent impaired loans |  |  |  |  |
Fair Value Measurements |  |  |  |  |
Impaired loans with a specific allowance | 2,900,000 | $ 4,200,000 | 2,900,000 | $ 4,200,000 |
Specific allowance related to impaired loans | 398,000 | 891,000 | 398,000 | 891,000 |
Impaired financing receivable charge offs | $ 77,000 | $ 53,000 | $ 204,000 | $ 303,000 |

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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