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Servicing Assets (Changes in serving rights at fair value) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Servicing Asset At Fair Value Amount [Roll Forward]    
Fair value $ 50,779 $ 10,716
Servicing from mortgage securitizations or asset transfers 456 302
Changes due to payments on loans (767) (201)
Changes in fair value due to changes in valuation model inputs or assumptions (1,181) (194)
Fair value $ 49,287 $ 10,623