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Servicing Assets (Changes in Serving Rights at Fair Value) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Servicing Asset At Fair Value Amount [Roll Forward]        
Fair value at beginning of period $ 47,911 $ 49,287 $ 47,295 $ 50,779
Servicing from mortgage securitizations or asset transfers 2,023 124 3,443 580
Changes due to payments on loans (1,862) (678) (3,369) (1,445)
Changes in fair value due to changes in valuation model inputs or assumptions (360) (807) 343 (1,988)
Fair value at end of period $ 47,712 $ 47,926 $ 47,712 $ 47,926