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Fair Value Measurements - Mortgage Servicing Rights - Other (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Fair Value Measurements |  |  |  |  |
Impaired loans with a specific allowance | $ 22,878,000 |  | $ 22,878,000 |  | $ 25,389,000
Specific allowance related to impaired loans | 4,932,000 |  | 4,932,000 |  | $ 5,113,000
Collateral dependent impaired loans |  |  |  |  |
Fair Value Measurements |  |  |  |  |
Impaired loans with a specific allowance | 31,200,000 | $ 2,900,000 | 31,200,000 | $ 2,900,000 |
Specific allowance related to impaired loans | 4,600,000 | 200,000 | 4,600,000 | 200,000 |
Impaired financing receivable charge offs | $ 33,000 | $ 36,000 | $ 69,000 | $ 129,000 |

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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=121611835&loc=d3e5212-111524 + Details
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