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Investment Securities AFS and HTM Contractual Maturity Table (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Amortized Cost    
Due in one year or less $ 23,394  
Due after one year through five years 245,147  
Due after five years through ten years 190,071  
Due after ten years 584  
Total debt securities 459,196  
Fair Value    
Due in one year or less 23,632  
Due after one year through five years 256,811  
Due after five years through ten years 196,705  
Due after ten years 604  
Total debt securities 477,752  
Investment securities available for sale, amortized cost 5,368,493 $ 5,368,259
Investment securities available for sale, at fair value $ 5,407,998 5,396,812
Ratio of Fair Value to Amortized Cost 100.70%  
Amortized Cost    
Due in one year or less $ 0  
Due after one year through five years 2,481  
Due after five years through ten years 127,117  
Due after ten years 402,784  
Amortized cost 532,382 404,455
Fair Value    
Due in one year or less 0  
Due after one year through five years 2,513  
Due after five years through ten years 127,465  
Due after ten years 400,476  
Total debt securities $ 530,454 413,067
Ratio of Fair Value to Amortized Cost 99.60%  
Federal National Mortgage Association Certificates and Obligations (FNMA) and Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
Fair Value    
Investment securities available for sale, amortized cost $ 2,207,339 3,534,240
Investment securities available for sale, at fair value 2,251,627 3,563,457
Government National Mortgage Association (GNMA) [Member]    
Fair Value    
Investment securities available for sale, amortized cost 905,728 165,863
Investment securities available for sale, at fair value 902,084 167,332
Private Label [Member]    
Fair Value    
Investment securities available for sale, amortized cost 1,926 2,297
Investment securities available for sale, at fair value 1,917 2,294
GNMA commercial mortgage-related securities [Member]    
Fair Value    
Investment securities available for sale, amortized cost 1,794,286 1,097,913
Investment securities available for sale, at fair value 1,774,562 $ 1,073,893
Equity Securities [Member]    
Fair Value    
Investment securities available for sale, amortized cost 18  
Investment securities available for sale, at fair value $ 56