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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Dec. 31, 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 $ (15,099) $ (44,266)
Unrealized losses on available for sale securities, 12 months or more (52,868) (19,535)
Total unrealized losses on available for sale securities (67,967) (63,801)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,593,503 3,397,143
Fair value of unrealized losses on available for sale securities, 12 months or more 1,906,992 430,377
Total fair value of unrealized losses on available for sale securities $ 3,500,495 $ 3,827,520
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 92 145
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 105 22
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (4,491) $ (13,034)
Unrealized losses on held to maturity securities, 12 months or more (21,331) (351)
Total unrealized losses on held to maturity securities (25,822) (13,385)
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 457,289 $ 496,296
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 183 5
Fair value of unrealized losses on held to maturity securities, 12 months or more $ 751,088 $ 7,783
Total fair value of unrealized losses on held to maturity securities $ 1,208,377 $ 504,079
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 202 753
U.S. 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 $ (7)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (7)  
Fair value of unrealized losses on available for sale securities, less than 12 months 996  
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 $ 996  
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 $ (746) $ (11,937)
Unrealized losses on held to maturity securities, 12 months or more (2,431) (99)
Total unrealized losses on held to maturity securities (3,177) (12,036)
Fair value of unrealized losses on held to maturity securities, less than 12 months 122,761 414,186
Fair value of unrealized losses on held to maturity securities, 12 months or more 127,043 1,752
Total fair value of unrealized losses on held to maturity securities $ 249,804 $ 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 157 700
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 132 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 (8) (14)
Total unrealized losses on available for sale securities (8) (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 1,059 1,119
Total fair value of unrealized losses on available for sale securities $ 1,059 $ 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 $ (5,554) $ (16,445)
Unrealized losses on available for sale securities, 12 months or more (28,347) (19,521)
Total unrealized losses on available for sale securities (33,901) (35,966)
Fair value of unrealized losses on available for sale securities, less than 12 months 480,514 1,427,889
Fair value of unrealized losses on available for sale securities, 12 months or more 1,026,642 429,258
Total fair value of unrealized losses on available for sale securities $ 1,507,156 $ 1,857,147
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 33 74
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 70 21
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (299)  
Unrealized losses on held to maturity securities, 12 months or more (15,457)  
Total unrealized losses on held to maturity securities (15,756)  
Fair value of unrealized losses on held to maturity securities, less than 12 months 52,997  
Fair value of unrealized losses on held to maturity securities, 12 months or more 486,891  
Total fair value of unrealized losses on held to maturity securities $ 539,888  
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 2  
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 23  
Asset-backed Securities, Securitized Loans and Receivables [Member]    
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 $ (13)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (13)  
Fair value of unrealized losses on available for sale securities, less than 12 months 12,158  
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 $ 12,158  
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  
Other securities (debt and equity)    
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 1,675 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 $ 1,675 $ 1,479
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 4 3
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 0 0
FNMA / 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 $ (572) $ (2,602)
Unrealized losses on available for sale securities, 12 months or more (2,062) 0
Total unrealized losses on available for sale securities (2,634) (2,602)
Fair value of unrealized losses on available for sale securities, less than 12 months 69,939 244,252
Fair value of unrealized losses on available for sale securities, 12 months or more 142,093 0
Total fair value of unrealized losses on available for sale securities $ 212,032 $ 244,252
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 9 14
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 9 0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (73) $ (441)
Unrealized losses on held to maturity securities, 12 months or more (417) (252)
Total unrealized losses on held to maturity securities (490) (693)
Fair value of unrealized losses on held to maturity securities, less than 12 months 13,143 17,477
Fair value of unrealized losses on held to maturity securities, 12 months or more 16,262 6,031
Total fair value of unrealized losses on held to maturity securities $ 29,405 $ 23,508
FNMA / 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 8 14
FNMA / 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 10 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 $ (8,927) $ (25,198)
Unrealized losses on available for sale securities, 12 months or more (22,451) 0
Total unrealized losses on available for sale securities (31,378) (25,198)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,028,221 1,723,523
Fair value of unrealized losses on available for sale securities, 12 months or more 737,198 0
Total fair value of unrealized losses on available for sale securities $ 1,765,419 $ 1,723,523
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 44 54
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 25 0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (3,373) $ (656)
Unrealized losses on held to maturity securities, 12 months or more (3,026) 0
Total unrealized losses on held to maturity securities (6,399) (656)
Fair value of unrealized losses on held to maturity securities, less than 12 months 268,388 64,633
Fair value of unrealized losses on held to maturity securities, 12 months or more 120,892 0
Total fair value of unrealized losses on held to maturity securities $ 389,280 $ 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 35 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 18 0