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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (1,982) $ (5,262)
Unrealized losses on available for sale securities, 12 months or more (21,979) (93,347)
Total unrealized losses on available for sale securities (23,962) (98,610)
Fair value of unrealized losses on available for sale securities, less than 12 months 262,504 613,612
Fair value of unrealized losses on available for sale securities, 12 months or more 1,447,194 3,009,417
Total fair value of unrealized losses on available for sale securities $ 1,709,698 $ 3,623,028
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 24 41
Available for sale, number of securities, 12 months or more | security 98 190
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (63) $ (4,053)
Unrealized losses on held to maturity securities, 12 months or more (11,474) (43,780)
Total unrealized losses on held to maturity securities $ (11,537) $ (47,835)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 109 865
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 10,918 $ 390,929
Fair value of unrealized losses on held to maturity securities, 12 months or more 483,712 1,349,063
Total fair value of unrealized losses on held to maturity securities $ 494,630 $ 1,739,992
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 9 298
US Treasury Securities    
Investment securities available for sale    
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    
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)    
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (12) $ (2,860)
Unrealized losses on held to maturity securities, 12 months or more (140) (12,419)
Total unrealized losses on held to maturity securities (152) (15,279)
Fair value of unrealized losses on held to maturity securities, less than 12 months 3,962 313,212
Fair value of unrealized losses on held to maturity securities, 12 months or more 25,109 509,374
Total fair value of unrealized losses on held to maturity securities $ 29,071 $ 822,586
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, less than 12 months    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 8 272
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, 12 months or more    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 50 752
Private-label    
Investment securities available for sale    
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    
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    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (1,380) $ (698)
Unrealized losses on available for sale securities, 12 months or more (155) 0
Total unrealized losses on available for sale securities (1,535) (698)
Fair value of unrealized losses on available for sale securities, less than 12 months 205,710 142,432
Fair value of unrealized losses on available for sale securities, 12 months or more 5,839 0
Total fair value of unrealized losses on available for sale securities $ 211,550 $ 142,432
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 16 13
Available for sale, number of securities, 12 months or more | security 1 0
Asset-backed Securities, Securitized Loans and Receivables [Member]    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ 0  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities 0  
Fair value of unrealized losses on available for sale securities, less than 12 months 3,000  
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 $ 3,000  
Available-for-sale, Number of Securities    
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    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ 0 $ (31)
Unrealized losses on available for sale securities, 12 months or more (817) (3,479)
Total unrealized losses on available for sale securities (817) (3,510)
Fair value of unrealized losses on available for sale securities, less than 12 months 781 17,993
Fair value of unrealized losses on available for sale securities, 12 months or more 121,661 189,405
Total fair value of unrealized losses on available for sale securities $ 122,441 $ 207,398
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 3 15
Available for sale, number of securities, 12 months or more | security 14 17
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ 0 $ (780)
Unrealized losses on held to maturity securities, 12 months or more (145) (1,015)
Total unrealized losses on held to maturity securities (145) (1,795)
Fair value of unrealized losses on held to maturity securities, less than 12 months 0 57,896
Fair value of unrealized losses on held to maturity securities, 12 months or more 18,474 28,888
Total fair value of unrealized losses on held to maturity securities $ 18,474 $ 86,784
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, less than 12 months    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 0 13
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, 12 months or more    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 10 22
GNMA | Residential Related Securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (602) $ (4,529)
Unrealized losses on available for sale securities, 12 months or more (1,446) (37,355)
Total unrealized losses on available for sale securities (2,048) (41,885)
Fair value of unrealized losses on available for sale securities, less than 12 months 53,013 452,183
Fair value of unrealized losses on available for sale securities, 12 months or more 316,714 1,598,159
Total fair value of unrealized losses on available for sale securities $ 369,727 $ 2,050,342
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 2 12
Available for sale, number of securities, 12 months or more | security 13 79
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (51) $ (414)
Unrealized losses on held to maturity securities, 12 months or more (241) (7,767)
Total unrealized losses on held to maturity securities (292) (8,181)
Fair value of unrealized losses on held to maturity securities, less than 12 months 6,956 19,822
Fair value of unrealized losses on held to maturity securities, 12 months or more 35,339 320,387
Total fair value of unrealized losses on held to maturity securities $ 42,295 $ 340,209
GNMA | Residential Related Securities | Held to maturity, number of securities, less than 12 months    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 1 13
GNMA | Residential Related Securities | Held to maturity, number of securities, 12 months or more    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 27 66
GNMA | Commercial mortgage-related securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ 0 $ 0
Unrealized losses on available for sale securities, 12 months or more (19,562) (52,512)
Total unrealized losses on available for sale securities (19,562) (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 1,002,980 1,220,854
Total fair value of unrealized losses on available for sale securities $ 1,002,980 $ 1,220,854
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 0 0
Available for sale, number of securities, 12 months or more | security 70 93
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ 0 $ 0
Unrealized losses on held to maturity securities, 12 months or more (10,948) (22,579)
Total unrealized losses on held to maturity securities (10,948) (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 404,790 490,414
Total fair value of unrealized losses on held to maturity securities $ 404,790 $ 490,414
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months    
Investment securities held to maturity    
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    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 22 25