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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (15,724) $ (44,266)
Unrealized losses on available for sale securities, 12 months or more (28,113) (19,535)
Total unrealized losses on available for sale securities (43,837) (63,801)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,471,455 3,397,143
Fair value of unrealized losses on available for sale securities, 12 months or more 1,304,549 430,377
Total fair value of unrealized losses on available for sale securities $ 2,776,004 $ 3,827,520
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 87 145
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 73 22
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (3,788) $ (13,034)
Unrealized losses on held to maturity securities, 12 months or more (14,897) (351)
Total unrealized losses on held to maturity securities $ (18,685) $ (13,385)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 138 5
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 474,131 $ 496,296
Fair value of unrealized losses on held to maturity securities, 12 months or more 599,484 7,783
Total fair value of unrealized losses on held to maturity securities $ 1,073,615 $ 504,079
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 241 753
US Treasury Securities    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (2)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (2)  
Fair value of unrealized losses on available for sale securities, less than 12 months 1,001  
Fair value of unrealized losses on available for sale securities, 12 months or more 0  
Total fair value of unrealized losses on available for sale securities $ 1,001  
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 1  
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 0  
Obligations of state and political subdivisions (municipal securities)    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (1,195) $ (11,937)
Unrealized losses on held to maturity securities, 12 months or more (2,663) (99)
Total unrealized losses on held to maturity securities (3,858) (12,036)
Fair value of unrealized losses on held to maturity securities, less than 12 months 138,178 414,186
Fair value of unrealized losses on held to maturity securities, 12 months or more 94,432 1,752
Total fair value of unrealized losses on held to maturity securities $ 232,610 $ 415,938
Obligations of state and political subdivisions (municipal securities) | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 195 700
Obligations of state and political subdivisions (municipal securities) | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 108 4
Private Label    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ 0 $ 0
Unrealized losses on available for sale securities, 12 months or more (11) (14)
Total unrealized losses on available for sale securities (11) (14)
Fair value of unrealized losses on available for sale securities, less than 12 months 0 0
Fair value of unrealized losses on available for sale securities, 12 months or more 1,072 1,119
Total fair value of unrealized losses on available for sale securities $ 1,072 $ 1,119
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 0 0
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 1 1
GNMA Commercial Mortgage-Related Securities    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (4,962) $ (16,445)
Unrealized losses on available for sale securities, 12 months or more (21,203) (19,521)
Total unrealized losses on available for sale securities (26,165) (35,966)
Fair value of unrealized losses on available for sale securities, less than 12 months 551,833 1,427,889
Fair value of unrealized losses on available for sale securities, 12 months or more 891,178 429,258
Total fair value of unrealized losses on available for sale securities $ 1,443,011 $ 1,857,147
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 42 74
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 56 21
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (841)  
Unrealized losses on held to maturity securities, 12 months or more (10,967)  
Total unrealized losses on held to maturity securities (11,808)  
Fair value of unrealized losses on held to maturity securities, less than 12 months 94,758  
Fair value of unrealized losses on held to maturity securities, 12 months or more 427,161  
Total fair value of unrealized losses on held to maturity securities $ 521,919  
GNMA Commercial Mortgage-Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 5  
GNMA Commercial Mortgage-Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 19  
Asset backed Securities    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (25)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (25)  
Fair value of unrealized losses on available for sale securities, less than 12 months 52,851  
Fair value of unrealized losses on available for sale securities, 12 months or more 0  
Total fair value of unrealized losses on available for sale securities $ 52,851  
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 5  
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 0  
Other Debt And Other Equity Securities    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (26) $ (21)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (26) (21)
Fair value of unrealized losses on available for sale securities, less than 12 months 174 1,479
Fair value of unrealized losses on available for sale securities, 12 months or more 0 0
Total fair value of unrealized losses on available for sale securities $ 174 $ 1,479
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 1 3
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 0 0
FNMA and FHLMC | Residential Related Securities    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (1,254) $ (2,602)
Unrealized losses on available for sale securities, 12 months or more (306) 0
Total unrealized losses on available for sale securities (1,560) (2,602)
Fair value of unrealized losses on available for sale securities, less than 12 months 177,782 244,252
Fair value of unrealized losses on available for sale securities, 12 months or more 33,842 0
Total fair value of unrealized losses on available for sale securities $ 211,624 $ 244,252
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 16 14
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 2 0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (124) $ (441)
Unrealized losses on held to maturity securities, 12 months or more (280) (252)
Total unrealized losses on held to maturity securities (404) (693)
Fair value of unrealized losses on held to maturity securities, less than 12 months 17,816 17,477
Fair value of unrealized losses on held to maturity securities, 12 months or more 9,910 6,031
Total fair value of unrealized losses on held to maturity securities $ 27,726 $ 23,508
FNMA and FHLMC | Residential Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 12 14
FNMA and FHLMC | Residential Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 4 1
GNMA | Residential Related Securities    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (9,455) $ (25,198)
Unrealized losses on available for sale securities, 12 months or more (6,593) 0
Total unrealized losses on available for sale securities (16,048) (25,198)
Fair value of unrealized losses on available for sale securities, less than 12 months 687,814 1,723,523
Fair value of unrealized losses on available for sale securities, 12 months or more 378,457 0
Total fair value of unrealized losses on available for sale securities $ 1,066,271 $ 1,723,523
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 22 54
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 14 0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (1,628) $ (656)
Unrealized losses on held to maturity securities, 12 months or more (987) 0
Total unrealized losses on held to maturity securities (2,615) (656)
Fair value of unrealized losses on held to maturity securities, less than 12 months 223,379 64,633
Fair value of unrealized losses on held to maturity securities, 12 months or more 67,981 0
Total fair value of unrealized losses on held to maturity securities $ 291,360 $ 64,633
GNMA | Residential Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 29 39
GNMA | Residential Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 7 0