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Derivative Financial Instruments (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivatives, Fair Value [Line Items]        
Net gains on derivatives $ 0.6 $ 1.6 $ 1.6 $ 4.9
Commitment to Originate Mortgage Loans        
Derivatives, Fair Value [Line Items]        
Interest rate lock agreements, aggregate principal balance 305.2   305.2  
No Commitment to Originate Mortgage Loans        
Derivatives, Fair Value [Line Items]        
Mortgage loans held-for-sale, net 103.0   103.0  
Forward Sales of Mortgage Backed Securities        
Derivatives, Fair Value [Line Items]        
Interest rate lock agreements, aggregate principal balance $ 264.5   $ 264.5