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Servicing Assets (Changes in Serving Rights at Fair Value) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Servicing Asset At Fair Value Amount [Roll Forward]    
Fair value at beginning of period $ 47,295 $ 50,779
Servicing from mortgage securitizations or asset transfers 1,420 456
Changes due to payments on loans (1,507) (767)
Changes in fair value due to changes in valuation model inputs or assumptions 703 (1,181)
Fair value at end of period $ 47,911 $ 49,287