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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Mar. 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 $ (41,731) $ (44,266)
Unrealized losses on available for sale securities, 12 months or more (17,573) (19,535)
Total unrealized losses on available for sale securities (59,304) (63,801)
Fair value of unrealized losses on available for sale securities, less than 12 months 3,070,774 3,397,143
Fair value of unrealized losses on available for sale securities, 12 months or more 369,824 430,377
Total fair value of unrealized losses on available for sale securities $ 3,440,598 $ 3,827,520
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 145 145
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 20 22
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (15,018) $ (13,034)
Unrealized losses on held to maturity securities, 12 months or more (2,207) (351)
Total unrealized losses on held to maturity securities $ (17,225) $ (13,385)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 7 5
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 680,421 $ 496,296
Fair value of unrealized losses on held to maturity securities, 12 months or more 47,119 7,783
Total fair value of unrealized losses on held to maturity securities $ 727,540 $ 504,079
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 601 753
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 $ (9,407) $ (11,937)
Unrealized losses on held to maturity securities, 12 months or more (72) (99)
Total unrealized losses on held to maturity securities (9,479) (12,036)
Fair value of unrealized losses on held to maturity securities, less than 12 months 342,534 414,186
Fair value of unrealized losses on held to maturity securities, 12 months or more 1,778 1,752
Total fair value of unrealized losses on held to maturity securities $ 344,312 $ 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 538 700
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 4 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 (16) (14)
Total unrealized losses on available for sale securities (16) (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 1,100 1,119
Total fair value of unrealized losses on available for sale securities $ 1,100 $ 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 $ (15,538) $ (16,445)
Unrealized losses on available for sale securities, 12 months or more (17,557) (19,521)
Total unrealized losses on available for sale securities (33,095) (35,966)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,214,494 1,427,889
Fair value of unrealized losses on available for sale securities, 12 months or more 368,724 429,258
Total fair value of unrealized losses on available for sale securities $ 1,583,218 $ 1,857,147
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 73 74
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 19 21
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (4,369)  
Unrealized losses on held to maturity securities, 12 months or more (1,888)  
Total unrealized losses on held to maturity securities (6,257)  
Fair value of unrealized losses on held to maturity securities, less than 12 months 255,424  
Fair value of unrealized losses on held to maturity securities, 12 months or more 39,556  
Total fair value of unrealized losses on held to maturity securities $ 294,980  
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 9  
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 2  
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 $ (11) $ (21)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (11) (21)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,489 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 $ 1,489 $ 1,479
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 3 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 $ (1,117) $ (2,602)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (1,117) (2,602)
Fair value of unrealized losses on available for sale securities, less than 12 months 216,103 244,252
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 $ 216,103 $ 244,252
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 13 14
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 $ (480) $ (441)
Unrealized losses on held to maturity securities, 12 months or more (247) (252)
Total unrealized losses on held to maturity securities (727) (693)
Fair value of unrealized losses on held to maturity securities, less than 12 months 19,969 17,477
Fair value of unrealized losses on held to maturity securities, 12 months or more 5,785 6,031
Total fair value of unrealized losses on held to maturity securities $ 25,754 $ 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 16 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 1 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 $ (25,065) $ (25,198)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (25,065) (25,198)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,638,688 1,723,523
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 $ 1,638,688 $ 1,723,523
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 56 54
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 $ (762) $ (656)
Unrealized losses on held to maturity securities, 12 months or more 0 0
Total unrealized losses on held to maturity securities (762) (656)
Fair value of unrealized losses on held to maturity securities, less than 12 months 62,494 64,633
Fair value of unrealized losses on held to maturity securities, 12 months or more 0 0
Total fair value of unrealized losses on held to maturity securities $ 62,494 $ 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 38 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 0 0