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Fair Value Measurements Fair Value Option, Disclosures (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Held-for-sale, Fair Value Disclosure $ 19,249 $ 7,908
Loans held for sale (valued under fair value option $19,249 and $7,908) 19,249 11,869
Fair Value, Option, Loans Held as Assets, Aggregate Difference 232 (319)
loans held for sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale (valued under fair value option $19,249 and $7,908) $ 19,017 $ 8,227