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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
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 $ (1,959) $ (5,262)
Unrealized losses on available for sale securities, 12 months or more (68,205) (93,347)
Total unrealized losses on available for sale securities (70,164) (98,610)
Fair value of unrealized losses on available for sale securities, less than 12 months 245,744 613,612
Fair value of unrealized losses on available for sale securities, 12 months or more 3,030,042 3,009,417
Total fair value of unrealized losses on available for sale securities $ 3,275,786 $ 3,623,028
Available for sale, number of securities, less than 12 months | security 28 41
Available for sale, number of securities, 12 months or more | security 182 190
Held-to-maturity Securities Continuous Unrealized Loss Position    
Unrealized losses on held to maturity securities, less than 12 months $ (16) $ (4,053)
Unrealized losses on held to maturity securities, 12 months or more (26,093) (43,780)
Total unrealized losses on held to maturity securities $ (26,109) $ (47,835)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 303 865
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 7,264 $ 390,929
Fair value of unrealized losses on held to maturity securities, 12 months or more 950,613 1,349,063
Total fair value of unrealized losses on held to maturity securities $ 957,877 $ 1,739,992
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 8 298
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
Unrealized losses on available for sale securities, 12 months or more   (1)
Total unrealized losses on available for sale securities   (1)
Fair value of unrealized losses on available for sale securities, less than 12 months   0
Fair value of unrealized losses on available for sale securities, 12 months or more   999
Total fair value of unrealized losses on available for sale securities   $ 999
Available for sale, number of securities, less than 12 months | security   0
Available for sale, number of securities, 12 months or more | security   1
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 $ (13) $ (2,860)
Unrealized losses on held to maturity securities, 12 months or more (1,336) (12,419)
Total unrealized losses on held to maturity securities (1,349) (15,279)
Fair value of unrealized losses on held to maturity securities, less than 12 months 5,599 313,212
Fair value of unrealized losses on held to maturity securities, 12 months or more 136,727 509,374
Total fair value of unrealized losses on held to maturity securities $ 142,326 $ 822,586
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 7 272
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 193 752
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   $ (4)
Unrealized losses on available for sale securities, 12 months or more   0
Total unrealized losses on available for sale securities   (4)
Fair value of unrealized losses on available for sale securities, less than 12 months   1,003
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   $ 1,003
Available for sale, number of securities, less than 12 months | security   1
Available for sale, number of securities, 12 months or more | security   0
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 $ (195) $ (698)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (195) (698)
Fair value of unrealized losses on available for sale securities, less than 12 months 128,657 142,432
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 $ 128,657 $ 142,432
Available for sale, number of securities, less than 12 months | security 10 13
Available for sale, number of securities, 12 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 $ (5) $ (31)
Unrealized losses on available for sale securities, 12 months or more (2,448) (3,479)
Total unrealized losses on available for sale securities (2,453) (3,510)
Fair value of unrealized losses on available for sale securities, less than 12 months 6,468 17,993
Fair value of unrealized losses on available for sale securities, 12 months or more 172,018 189,405
Total fair value of unrealized losses on available for sale securities $ 178,486 $ 207,398
Available for sale, number of securities, less than 12 months | security 9 15
Available for sale, number of securities, 12 months or more | security 17 17
Held-to-maturity Securities Continuous Unrealized Loss Position    
Unrealized losses on held to maturity securities, less than 12 months $ (3) $ (780)
Unrealized losses on held to maturity securities, 12 months or more (598) (1,015)
Total unrealized losses on held to maturity securities (601) (1,795)
Fair value of unrealized losses on held to maturity securities, less than 12 months 1,664 57,896
Fair value of unrealized losses on held to maturity securities, 12 months or more 51,691 28,888
Total fair value of unrealized losses on held to maturity securities $ 53,356 $ 86,784
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 1 13
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 22 22
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 $ (1,760) $ (4,529)
Unrealized losses on available for sale securities, 12 months or more (21,245) (37,355)
Total unrealized losses on available for sale securities (23,004) (41,885)
Fair value of unrealized losses on available for sale securities, less than 12 months 110,619 452,183
Fair value of unrealized losses on available for sale securities, 12 months or more 1,660,128 1,598,159
Total fair value of unrealized losses on available for sale securities $ 1,770,747 $ 2,050,342
Available for sale, number of securities, less than 12 months | security 9 12
Available for sale, number of securities, 12 months or more | security 73 79
Held-to-maturity Securities Continuous Unrealized Loss Position    
Unrealized losses on held to maturity securities, less than 12 months $ 0 $ (414)
Unrealized losses on held to maturity securities, 12 months or more (3,314) (7,767)
Total unrealized losses on held to maturity securities (3,314) (8,181)
Fair value of unrealized losses on held to maturity securities, less than 12 months 0 19,822
Fair value of unrealized losses on held to maturity securities, 12 months or more 283,774 320,387
Total fair value of unrealized losses on held to maturity securities $ 283,774 $ 340,209
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 0 13
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 63 66
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 $ 0 $ 0
Unrealized losses on available for sale securities, 12 months or more (44,512) (52,512)
Total unrealized losses on available for sale securities (44,512) (52,512)
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 1,197,896 1,220,854
Total fair value of unrealized losses on available for sale securities $ 1,197,896 $ 1,220,854
Available for sale, number of securities, less than 12 months | security 0 0
Available for sale, number of securities, 12 months or more | security 92 93
Held-to-maturity Securities Continuous Unrealized Loss Position    
Unrealized losses on held to maturity securities, less than 12 months $ 0 $ 0
Unrealized losses on held to maturity securities, 12 months or more (20,846) (22,579)
Total unrealized losses on held to maturity securities (20,846) (22,579)
Fair value of unrealized losses on held to maturity securities, less than 12 months 0 0
Fair value of unrealized losses on held to maturity securities, 12 months or more 478,421 490,414
Total fair value of unrealized losses on held to maturity securities $ 478,421 $ 490,414
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 0 0
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 25 25