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Servicing Assets (Changes in Serving Rights at Fair Value) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Servicing Asset At Fair Value Amount [Roll Forward]      
Fair value $ 50,779 $ 10,716 $ 9,821
Servicing from mortgage securitizations or asset transfers 2,394 1,174 1,481
Additions from servicing portfolio acquired 0 40,463 0
Changes due to payments on loans (4,067) (906) (814)
Changes in fair value due to changes in valuation model inputs or assumptions (1,811) (668) 228
Fair value $ 47,295 $ 50,779 $ 10,716