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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Securities [Abstract]    
Debt Securities Available for Sale, Due in one year or less, Amortized Cost $ 4,523  
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost 42,881  
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost 992,327  
Debt Securities Available for Sale, Due after ten years, Amortized Cost 1,522,269  
Total available for sale debt securities, Amortized Cost 2,562,000  
Debt Securities Available for Sale, Due in one year or less, Fair Value 4,536  
Debt Securities Available for Sale, Due after one year through five years, Fair Value 43,424  
Debt Securities Available for Sale, Due after five years through ten years, Fair Value 964,119  
Debt Securities Available for Sale, Due after ten years, Fair Value 1,504,829  
Total available for sale debt securities, Fair Value 2,516,908  
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost 6,727  
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost 135,187  
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost 691,248  
Debt Securities Held to Maturity, Due after ten years, Amortized Cost 1,667,058  
Securities Held to Maturity, Amortized Cost 2,500,220 $ 2,370,388
Debt Securities Held to Maturity, Due in one year or less, Fair Value 6,740  
Debt Securities Held to Maturity, Due after one year through five years, Fair Value 136,268  
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value 668,507  
Debt Securities Held to Maturity, Due after ten years, Fair Value 1,658,602  
Total held to maturity securities, Fair Value $ 2,470,117 $ 2,375,851