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Derivative Financial Instruments - Effects of Derivative Instruments on Statements of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivatives in Hedging Relationships [Member] | Accumulated Other Comprehensive Income (Loss) and Other Interest Expense [Member]        
Derivatives, Fair Value [Line Items]        
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) and recognized in other interest expense   $ 101   $ 413
Derivatives not Designated as Hedging Instruments [Member] | Mortgage Banking, Net [Member]        
Derivatives, Fair Value [Line Items]        
Amount of gain (loss) recognized in mortgage banking, net $ 74 6,191 $ 45,955 18,988
Derivatives not Designated as Hedging Instruments [Member] | Bank Card and Other Fees [Member]        
Derivatives, Fair Value [Line Items]        
Amount of gain (loss) recognized in bank card and other fees $ 234 $ (600) $ (1,502) $ (1,343)