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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
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 $ (44,266) $ (27,621)
Unrealized losses on available for sale securities, 12 months or more (19,535) (25,516)
Total unrealized losses on available for sale securities (63,801) (53,137)
Fair value of unrealized losses on available for sale securities, less than 12 months 3,397,143 2,789,260
Fair value of unrealized losses on available for sale securities, 12 months or more 430,377 787,969
Total fair value of unrealized losses on available for sale securities $ 3,827,520 $ 3,577,229
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 145 105
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 22 38
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (13,034) $ (524)
Unrealized losses on held to maturity securities, 12 months or more (351) (769)
Total unrealized losses on held to maturity securities (13,385) (1,293)
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 496,296 $ 81,390
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 5 30
Fair value of unrealized losses on held to maturity securities, 12 months or more $ 7,783 $ 27,157
Total fair value of unrealized losses on held to maturity securities $ 504,079 $ 108,547
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 753 84
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   $ (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   997
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   $ 997
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
Municipal securities    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (11,937) $ (146)
Unrealized losses on held to maturity securities, 12 months or more (99) (193)
Total unrealized losses on held to maturity securities (12,036) (339)
Fair value of unrealized losses on held to maturity securities, less than 12 months 414,186 23,137
Fair value of unrealized losses on held to maturity securities, 12 months or more 1,752 9,254
Total fair value of unrealized losses on held to maturity securities $ 415,938 $ 32,391
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 700 53
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 4 24
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 $ (1)
Unrealized losses on available for sale securities, 12 months or more (14) (13)
Total unrealized losses on available for sale securities (14) (14)
Fair value of unrealized losses on available for sale securities, less than 12 months 0 83
Fair value of unrealized losses on available for sale securities, 12 months or more 1,119 1,565
Total fair value of unrealized losses on available for sale securities $ 1,119 $ 1,648
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 0 1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 1 3
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 $ (16,445) $ (9,610)
Unrealized losses on available for sale securities, 12 months or more (19,521) (18,891)
Total unrealized losses on available for sale securities (35,966) (28,501)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,427,889 1,132,844
Fair value of unrealized losses on available for sale securities, 12 months or more 429,258 448,218
Total fair value of unrealized losses on available for sale securities $ 1,857,147 $ 1,581,062
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 74 40
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 21 21
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 $ (21)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (21)  
Fair value of unrealized losses on available for sale securities, less than 12 months 1,479  
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 $ 1,479  
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 3  
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 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 $ (2,602) $ (1,548)
Unrealized losses on available for sale securities, 12 months or more 0 (6,612)
Total unrealized losses on available for sale securities (2,602) (8,160)
Fair value of unrealized losses on available for sale securities, less than 12 months 244,252 220,852
Fair value of unrealized losses on available for sale securities, 12 months or more 0 338,186
Total fair value of unrealized losses on available for sale securities $ 244,252 $ 559,038
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 14 17
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 0 14
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (441) $ (177)
Unrealized losses on held to maturity securities, 12 months or more (252) (468)
Total unrealized losses on held to maturity securities (693) (645)
Fair value of unrealized losses on held to maturity securities, less than 12 months 17,477 12,754
Fair value of unrealized losses on held to maturity securities, 12 months or more 6,031 11,106
Total fair value of unrealized losses on held to maturity securities $ 23,508 $ 23,860
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 14 10
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 1 3
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 $ (25,198) $ (16,460)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (25,198) (16,460)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,723,523 1,434,484
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 $ 1,723,523 $ 1,434,484
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 54 46
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 0 0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (656) $ (201)
Unrealized losses on held to maturity securities, 12 months or more 0 (108)
Total unrealized losses on held to maturity securities (656) (309)
Fair value of unrealized losses on held to maturity securities, less than 12 months 64,633 45,499
Fair value of unrealized losses on held to maturity securities, 12 months or more 0 6,797
Total fair value of unrealized losses on held to maturity securities $ 64,633 $ 52,296
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 39 21
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 0 3