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Fair Value Measurements Fair Value Option, Disclosures (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale (valued under fair value option $29,018 and $35,750) $ 29,018 $ 35,750
Loans held for sale (valued under fair value option $29,018 and $35,750) 29,018 36,053
Fair Value, Option, Loans Held as Assets, Aggregate Difference 585 564
loans held for sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale (valued under fair value option $29,018 and $35,750) $ 28,433 $ 35,186