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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Sep. 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 $ (3,758) $ (5,262)
Unrealized losses on available for sale securities, 12 months or more (11,016) (93,347)
Total unrealized losses on available for sale securities (14,774) (98,610)
Fair value of unrealized losses on available for sale securities, less than 12 months 513,592 613,612
Fair value of unrealized losses on available for sale securities, 12 months or more 819,089 3,009,417
Total fair value of unrealized losses on available for sale securities $ 1,332,681 $ 3,623,028
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 47 41
Available for sale, number of securities, 12 months or more | security 59 190
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (794) $ (4,053)
Unrealized losses on held to maturity securities, 12 months or more (5,009) (43,780)
Total unrealized losses on held to maturity securities $ (5,803) $ (47,835)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 40 865
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 73,718 $ 390,929
Fair value of unrealized losses on held to maturity securities, 12 months or more 402,227 1,349,063
Total fair value of unrealized losses on held to maturity securities $ 475,945 $ 1,739,992
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 31 298
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)(a)    
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 348  
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 348  
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months (705) $ (2,860)
Unrealized losses on held to maturity securities, 12 months or more (28) (12,419)
Total unrealized losses on held to maturity securities (733) (15,279)
Fair value of unrealized losses on held to maturity securities, less than 12 months 34,087 313,212
Fair value of unrealized losses on held to maturity securities, 12 months or more 3,846 509,374
Total fair value of unrealized losses on held to maturity securities $ 37,934 $ 822,586
Obligations of state and political subdivisions (municipal securities)(a) | Held to maturity, number of securities, less than 12 months    
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 1  
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 25 272
Obligations of state and political subdivisions (municipal securities)(a) | Held to maturity, number of securities, 12 months or more    
Available-for-sale, Number of Securities    
Available for sale, number of securities, 12 months or more | security 0  
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 10 752
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 $ (2,853) $ (698)
Unrealized losses on available for sale securities, 12 months or more (270) 0
Total unrealized losses on available for sale securities (3,123) (698)
Fair value of unrealized losses on available for sale securities, less than 12 months 241,852 142,432
Fair value of unrealized losses on available for sale securities, 12 months or more 13,213 0
Total fair value of unrealized losses on available for sale securities $ 255,065 $ 142,432
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 18 13
Available for sale, number of securities, 12 months or more | security 2 0
Other Debt securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (7)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (7)  
Fair value of unrealized losses on available for sale securities, less than 12 months 2,993  
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 $ 2,993  
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 $ (38) $ (31)
Unrealized losses on available for sale securities, 12 months or more (289) (3,479)
Total unrealized losses on available for sale securities (326) (3,510)
Fair value of unrealized losses on available for sale securities, less than 12 months 21,554 17,993
Fair value of unrealized losses on available for sale securities, 12 months or more 65,798 189,405
Total fair value of unrealized losses on available for sale securities $ 87,352 $ 207,398
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 6 15
Available for sale, number of securities, 12 months or more | security 10 17
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (8) $ (780)
Unrealized losses on held to maturity securities, 12 months or more (9) (1,015)
Total unrealized losses on held to maturity securities (17) (1,795)
Fair value of unrealized losses on held to maturity securities, less than 12 months 3,674 57,896
Fair value of unrealized losses on held to maturity securities, 12 months or more 840 28,888
Total fair value of unrealized losses on held to maturity securities $ 4,514 $ 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 3 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 1 22
GNMA | Residential Related Securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (440) $ (4,529)
Unrealized losses on available for sale securities, 12 months or more (881) (37,355)
Total unrealized losses on available for sale securities (1,322) (41,885)
Fair value of unrealized losses on available for sale securities, less than 12 months 67,563 452,183
Fair value of unrealized losses on available for sale securities, 12 months or more 86,930 1,598,159
Total fair value of unrealized losses on available for sale securities $ 154,493 $ 2,050,342
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 4 12
Available for sale, number of securities, 12 months or more | security 3 79
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (25) $ (414)
Unrealized losses on held to maturity securities, 12 months or more (69) (7,767)
Total unrealized losses on held to maturity securities (94) (8,181)
Fair value of unrealized losses on held to maturity securities, less than 12 months 6,490 19,822
Fair value of unrealized losses on held to maturity securities, 12 months or more 6,938 320,387
Total fair value of unrealized losses on held to maturity securities $ 13,429 $ 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 8 66
GNMA | Commercial mortgage-related securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (420) $ 0
Unrealized losses on available for sale securities, 12 months or more (9,576) (52,512)
Total unrealized losses on available for sale securities (9,996) (52,512)
Fair value of unrealized losses on available for sale securities, less than 12 months 179,281 0
Fair value of unrealized losses on available for sale securities, 12 months or more 653,148 1,220,854
Total fair value of unrealized losses on available for sale securities $ 832,429 $ 1,220,854
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 15 0
Available for sale, number of securities, 12 months or more | security 44 93
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (56) $ 0
Unrealized losses on held to maturity securities, 12 months or more (4,903) (22,579)
Total unrealized losses on held to maturity securities (4,959) (22,579)
Fair value of unrealized losses on held to maturity securities, less than 12 months 29,467 0
Fair value of unrealized losses on held to maturity securities, 12 months or more 390,602 490,414
Total fair value of unrealized losses on held to maturity securities $ 420,069 $ 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 2 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 21 25