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Derivative Financial Instruments (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivatives, Fair Value [Line Items]        
Net gains (loss) on derivatives $ 1.6 $ 0.5 $ 4.9 $ 1.9
Commitment to Originate Mortgage Loans        
Derivatives, Fair Value [Line Items]        
Interest rate lock agreements, aggregate principal balance 254.7   254.7  
No Commitment to Originate Mortgage Loans        
Derivatives, Fair Value [Line Items]        
Mortgage loans held-for-sale, net 53.0   53.0  
Forward Sales of Mortgage Backed Securities        
Derivatives, Fair Value [Line Items]        
Interest rate lock agreements, aggregate principal balance $ 201.0   $ 201.0