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Securities (Schedule of Contractual Maturities of Debt Securities Available-for-Sale) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract]    
Due within one year, Amortized Cost $ 69,317  
Due after one year through five years, Amortized Cost 713,669  
Due after five years through ten years, Amortized Cost 2,295,998  
Due after ten years, Amortized Cost 1,918,545  
Debt Securities Available-for-Sale, Amortized Cost 4,997,529 $ 3,703,096
Due within one year, Fair Value 69,895  
Due after one year through five years, Fair Value 752,119  
Due after five years through ten years, Fair Value 2,431,876  
Due after ten years, Fair Value 1,956,244  
Debt Securities Available-for-Sale, Fair Value $ 5,210,134 $ 3,746,142