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Derivative Financial Instruments (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivatives, Fair Value [Line Items]        
Net gains on derivatives $ (8.1) $ 2.3 $ 1.0 $ 3.3
Commitment to Originate Mortgage Loans        
Derivatives, Fair Value [Line Items]        
Interest rate lock agreements, aggregate principal balance 306.0   306.0  
No Commitment to Originate Mortgage Loans        
Derivatives, Fair Value [Line Items]        
Mortgage loans held-for-sale, net 64.9   64.9  
Forward Sales of Mortgage Backed Securities        
Derivatives, Fair Value [Line Items]        
Interest rate lock agreements, aggregate principal balance $ 189.5   $ 189.5