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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Summary of Cash Flow Hedge Activity [Line Items]        
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ 14,566 $ 25,378 $ 99,183 $ 28,405
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 18,087 35,264 125,708 46,137
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax (3,521) (9,886) (26,525) (17,732)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 2,155 (1,031) 1,887 (1,709)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 3,186 0 3,949 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax (1,031) (1,031) (2,062) (1,709)
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 14,566 25,378 99,183 28,405
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 18,087 35,264 125,708 46,137
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax (3,521) (9,886) (26,525) (17,732)
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 2,155 (1,031) 1,887 (1,709)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 3,186 0 3,949 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax $ (1,031) $ (1,031) $ (2,062) $ (1,709)