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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
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 $ (32,768) $ (15,099)
Unrealized losses on available for sale securities, 12 months or more (108,825) (52,868)
Total unrealized losses on available for sale securities (141,593) (67,967)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,342,269 1,593,503
Fair value of unrealized losses on available for sale securities, 12 months or more 2,391,452 1,906,992
Total fair value of unrealized losses on available for sale securities $ 3,733,721 $ 3,500,495
Available for sale, number of securities, less than 12 months | security 75 92
Available for sale, number of securities, 12 months or more | security 152 105
Held-to-maturity Securities Continuous Unrealized Loss Position    
Unrealized losses on held to maturity securities, less than 12 months $ (27,976) $ (4,491)
Unrealized losses on held to maturity securities, 12 months or more (49,983) (21,331)
Total unrealized losses on held to maturity securities $ (77,961) $ (25,822)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 316 183
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 1,209,055 $ 457,289
Fair value of unrealized losses on held to maturity securities, 12 months or more 946,637 751,088
Total fair value of unrealized losses on held to maturity securities $ 2,155,692 $ 1,208,377
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 1,350 202
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 $ 0 $ (7)
Unrealized losses on available for sale securities, 12 months or more (4) 0
Total unrealized losses on available for sale securities (4) (7)
Fair value of unrealized losses on available for sale securities, less than 12 months 0 996
Fair value of unrealized losses on available for sale securities, 12 months or more 997 0
Total fair value of unrealized losses on available for sale securities $ 997 $ 996
Available for sale, number of securities, less than 12 months | security 0 1
Available for sale, number of securities, 12 months or more | security 1 0
Obligations of state and political subdivisions (municipal securities)    
Held-to-maturity Securities Continuous Unrealized Loss Position    
Unrealized losses on held to maturity securities, less than 12 months $ (22,552) $ (746)
Unrealized losses on held to maturity securities, 12 months or more (10,779) (2,431)
Total unrealized losses on held to maturity securities (33,332) (3,177)
Fair value of unrealized losses on held to maturity securities, less than 12 months 1,026,504 122,761
Fair value of unrealized losses on held to maturity securities, 12 months or more 187,493 127,043
Total fair value of unrealized losses on held to maturity securities $ 1,213,997 $ 249,804
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, less than 12 months    
Held-to-maturity Securities Continuous Unrealized Loss Position    
Number of held to maturity securities in a continuous unrealized loss position | security 1,288 157
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, 12 months or more    
Held-to-maturity Securities Continuous Unrealized Loss Position    
Number of held to maturity securities in a continuous unrealized loss position | security 228 132
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 (4) (8)
Total unrealized losses on available for sale securities (4) (8)
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 1,018 1,059
Total fair value of unrealized losses on available for sale securities $ 1,018 $ 1,059
Available for sale, number of securities, less than 12 months | security 0 0
Available for sale, number of securities, 12 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 $ (2,397) $ (5,554)
Unrealized losses on available for sale securities, 12 months or more (53,427) (28,347)
Total unrealized losses on available for sale securities (55,824) (33,901)
Fair value of unrealized losses on available for sale securities, less than 12 months 63,846 480,514
Fair value of unrealized losses on available for sale securities, 12 months or more 1,187,406 1,026,642
Total fair value of unrealized losses on available for sale securities $ 1,251,252 $ 1,507,156
Available for sale, number of securities, less than 12 months | security 4 33
Available for sale, number of securities, 12 months or more | security 89 70
Held-to-maturity Securities Continuous Unrealized Loss Position    
Unrealized losses on held to maturity securities, less than 12 months $ (951) $ (299)
Unrealized losses on held to maturity securities, 12 months or more (25,074) (15,457)
Total unrealized losses on held to maturity securities (26,026) (15,756)
Fair value of unrealized losses on held to maturity securities, less than 12 months 28,308 52,997
Fair value of unrealized losses on held to maturity securities, 12 months or more 470,212 486,891
Total fair value of unrealized losses on held to maturity securities $ 498,520 $ 539,888
GNMA Commercial Mortgage-Related Securities | Held to maturity, number of securities, less than 12 months    
Held-to-maturity Securities Continuous Unrealized Loss Position    
Number of held to maturity securities in a continuous unrealized loss position | security 1 2
GNMA Commercial Mortgage-Related Securities | Held to maturity, number of securities, 12 months or more    
Held-to-maturity Securities Continuous Unrealized Loss Position    
Number of held to maturity securities in a continuous unrealized loss position | security 24 23
FFELP 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 $ (101) $ (13)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (101) (13)
Fair value of unrealized losses on available for sale securities, less than 12 months 67,798 12,158
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 $ 67,798 $ 12,158
Available for sale, number of securities, less than 12 months | security 6 1
Available for sale, number of securities, 12 months or more | security 0 0
Other Debt 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   $ (12)
Unrealized losses on available for sale securities, 12 months or more   0
Total unrealized losses on available for sale securities   (12)
Fair value of unrealized losses on available for sale securities, less than 12 months   188
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   $ 188
Available for sale, number of securities, less than 12 months | security   1
Available for sale, number of securities, 12 months or more | security   0
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   $ (14)
Unrealized losses on available for sale securities, 12 months or more   0
Total unrealized losses on available for sale securities   (14)
Fair value of unrealized losses on available for sale securities, less than 12 months   1,487
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   $ 1,487
Available for sale, number of securities, less than 12 months | security   3
Available for sale, number of securities, 12 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 $ (583) $ (572)
Unrealized losses on available for sale securities, 12 months or more (5,549) (2,062)
Total unrealized losses on available for sale securities (6,132) (2,634)
Fair value of unrealized losses on available for sale securities, less than 12 months 60,527 69,939
Fair value of unrealized losses on available for sale securities, 12 months or more 172,119 142,093
Total fair value of unrealized losses on available for sale securities $ 232,646 $ 212,032
Available for sale, number of securities, less than 12 months | security 18 9
Available for sale, number of securities, 12 months or more | security 14 9
Held-to-maturity Securities Continuous Unrealized Loss Position    
Unrealized losses on held to maturity securities, less than 12 months $ (1,798) $ (73)
Unrealized losses on held to maturity securities, 12 months or more (1,469) (417)
Total unrealized losses on held to maturity securities (3,266) (490)
Fair value of unrealized losses on held to maturity securities, less than 12 months 64,876 13,143
Fair value of unrealized losses on held to maturity securities, 12 months or more 25,980 16,262
Total fair value of unrealized losses on held to maturity securities $ 90,856 $ 29,405
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, less than 12 months    
Held-to-maturity Securities Continuous Unrealized Loss Position    
Number of held to maturity securities in a continuous unrealized loss position | security 22 8
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, 12 months or more    
Held-to-maturity Securities Continuous Unrealized Loss Position    
Number of held to maturity securities in a continuous unrealized loss position | security 18 10
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 $ (29,687) $ (8,927)
Unrealized losses on available for sale securities, 12 months or more (49,841) (22,451)
Total unrealized losses on available for sale securities (79,528) (31,378)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,150,098 1,028,221
Fair value of unrealized losses on available for sale securities, 12 months or more 1,029,912 737,198
Total fair value of unrealized losses on available for sale securities $ 2,180,010 $ 1,765,419
Available for sale, number of securities, less than 12 months | security 47 44
Available for sale, number of securities, 12 months or more | security 47 25
Held-to-maturity Securities Continuous Unrealized Loss Position    
Unrealized losses on held to maturity securities, less than 12 months $ (2,676) $ (3,373)
Unrealized losses on held to maturity securities, 12 months or more (12,662) (3,026)
Total unrealized losses on held to maturity securities (15,337) (6,399)
Fair value of unrealized losses on held to maturity securities, less than 12 months 89,367 268,388
Fair value of unrealized losses on held to maturity securities, 12 months or more 262,952 120,892
Total fair value of unrealized losses on held to maturity securities $ 352,319 $ 389,280
GNMA | Residential Related Securities | Held to maturity, number of securities, less than 12 months    
Held-to-maturity Securities Continuous Unrealized Loss Position    
Number of held to maturity securities in a continuous unrealized loss position | security 39 35
GNMA | Residential Related Securities | Held to maturity, number of securities, 12 months or more    
Held-to-maturity Securities Continuous Unrealized Loss Position    
Number of held to maturity securities in a continuous unrealized loss position | security 46 18