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Mortgage banking activities -subnote (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mortgage banking        
Loss on repurchase of loans presented within the indemnity reserves   $ (0.7)   $ (2.4)
GNMA        
Mortgage banking        
Repurchased Loans     $ 753.0 $ 88.0
Loss for previously advanced interest on delinquent loans $ (10.5)      
GNMA | Bulk loan repurchase        
Mortgage banking        
Repurchased Loans $ 687.9