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Investment Securities (Amortized Cost and Estimated Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Held-to-maturity securities    
Amortized Cost $ 2,400 $ 2,400
Estimated Fair Value 2,400 2,400
Carrying Value 2,400 2,400
Available-for-sale securities    
Amortized Cost 4,196,034 4,894,428
Gross unrealized gains 50,165 68,516
Gross unrealized losses (46,827) (50,981)
Total investment securities 4,199,372 4,911,963
Assets/Liabilities Measured at Fair Value    
Available-for-sale securities    
Total investment securities 4,199,372 4,911,963
Carrying Value    
Available-for-sale securities    
Total investment securities 4,199,372 4,911,963
Other securities    
Held-to-maturity securities    
Amortized Cost 2,400 2,400
Estimated Fair Value 2,400 2,400
Carrying Value 2,400 2,400
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized Cost 3,908,809 4,597,590
Gross unrealized gains 30,959 47,960
Gross unrealized losses (46,557) (45,178)
Residential mortgage-backed securities | Assets/Liabilities Measured at Fair Value    
Available-for-sale securities    
Total investment securities 3,893,211 4,600,372
Residential mortgage-backed securities | Carrying Value    
Available-for-sale securities    
Total investment securities 3,893,211 4,600,372
Mortgage-backed securities by Ginnie Mae    
Available-for-sale securities    
Total investment securities 1,147,143 1,503,774
Mortgage-backed securities by Fannie Mae and Freddie Mac    
Available-for-sale securities    
Total investment securities 2,724,839 3,072,535
Mortgage-backed securities by non-government entities    
Available-for-sale securities    
Total investment securities 21,229 24,063
States and political subdivisions    
Available-for-sale securities    
Amortized Cost 259,150 268,763
Gross unrealized gains 18,579 19,131
Gross unrealized losses (25) (5,618)
States and political subdivisions | Assets/Liabilities Measured at Fair Value    
Available-for-sale securities    
Total investment securities 277,704 282,276
States and political subdivisions | Carrying Value    
Available-for-sale securities    
Total investment securities 277,704 282,276
Other    
Available-for-sale securities    
Amortized Cost 28,075 28,075
Gross unrealized gains 627 1,425
Gross unrealized losses (245) (185)
Other | Assets/Liabilities Measured at Fair Value    
Available-for-sale securities    
Total investment securities 28,457 29,315
Other | Carrying Value    
Available-for-sale securities    
Total investment securities $ 28,457 $ 29,315