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Derivative Instruments Derivative Instruments (Summary of Cash Flow Hedge Activity) (Details) - Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Summary of Cash Flow Hedge Activity [Line Items]        
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ (4,481) $ 17,760 $ 94,702 $ 46,165
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (4,087) 31,422 121,621 77,559
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax (394) (13,662) (26,919) (31,394)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 4,163 (1,042) 6,050 (2,751)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 5,509 0 9,458 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax (1,346) (1,042) (3,408) (2,751)
Interest Rate Floor [Member]        
Summary of Cash Flow Hedge Activity [Line Items]        
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax (4,481) 17,760 94,702 46,165
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (4,087) 31,422 121,621 77,559
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax (394) (13,662) (26,919) (31,394)
Interest and Fee Income on Loans [Member] | Interest Rate Floor [Member]        
Summary of Cash Flow Hedge Activity [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 4,163 (1,042) 6,050 (2,751)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 5,509 0 9,458 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax $ (1,346) $ (1,042) $ (3,408) $ (2,751)