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Fair Value Measurements - Mortgage Servicing Rights - Other (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Fair Value Measurements |  |
Impaired loans with a specific allowance | $ 6,385,000 | $ 7,923,000
Specific allowance related to impaired loans | 1,194,000 | 1,333,000
Collateral dependent impaired loans |  |
Fair Value Measurements |  |
Impaired loans with a specific allowance | 3,800,000 | 4,000,000
Specific allowance related to impaired loans | 867,000 | 870,000
Impaired financing receivable charge offs | $ 370,000 | $ 788,000

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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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- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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