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Estimated Fair Values (Fair Value Option) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]          
Gains (Losses) from fair value changes on originated loans held for sale $ 2,400 $ (82) $ 3,600 $ 167  
Loans Held For Sale          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value of originated loans held for sale 107,881   107,881   $ 67,869
Aggregate unpaid principle balance of originated loans held for sale 102,189   102,189   65,697
Difference between fair value and aggregate unpaid principle balance of originated loans held for sale $ 5,692   $ 5,692   $ 2,172