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Servicing Assets (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Servicing Assets At Fair Value [Line Items]        
Servicing Asset at Fair Value, Amount $ 47,911 $ 49,287 $ 47,295 $ 50,779
Contractually Specified Servicing Fees Amount 759 510    
Conventional Loan [Member]        
Servicing Assets At Fair Value [Line Items]        
Contractually Specified Servicing Fees Amount $ 5,200 $ 4,800