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Derivative Instruments Derivative Instruments (Summary of Cash Flow Hedge Activity) (Details) - Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of Cash Flow Hedge Activity [Line Items]      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ 93,497 $ 27,481 $ 8,381
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 120,140 50,327 0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax (26,643) (22,846) 8,381
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 10,319 (3,793) (760)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 15,257 0 0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax (4,938) (3,793) (760)
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 93,497 27,481 8,381
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 120,140 50,327 0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax (26,643) (22,846) 8,381
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 10,319 (3,793) (760)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 15,257 0 0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax $ (4,938) $ (3,793) $ (760)