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Investment Securities - Summary of Unrealized Losses on Held to Maturity Securities (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Investment
Dec. 31, 2018
USD ($)
Investment
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Fair Value of Investments, Less than 12 months $ 299,424 $ 3,851,352
Unrealized Losses, Less than 12 months (1,012) (56,636)
Fair Value of Investments, 12 months or longer 8,939,961 8,092,085
Unrealized Losses, 12 months or longer (148,946) (259,610)
Fair Value of Investments 9,239,385 11,943,437
Unrealized Losses $ (149,958) $ (316,246)
Number of held-to-maturity investments with unrealized loss | Investment 676 1,244
Number of held-to-maturity investments in continuous loss more than 12 months | Investment 659 695
U.S. agency debentures    
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Fair Value of Investments, Less than 12 months $ 86,931 $ 291,432
Unrealized Losses, Less than 12 months (222) (2,915)
Fair Value of Investments, 12 months or longer 278,876 66,624
Unrealized Losses, 12 months or longer (2,728) (1,935)
Fair Value of Investments 365,807 358,056
Unrealized Losses (2,950) (4,850)
Agency-issued mortgage-backed securities    
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Fair Value of Investments, Less than 12 months 0 2,493,156
Unrealized Losses, Less than 12 months 0 (34,956)
Fair Value of Investments, 12 months or longer 4,886,510 3,972,690
Unrealized Losses, 12 months or longer (50,917) (122,811)
Fair Value of Investments 4,886,510 6,465,846
Unrealized Losses (50,917) (157,767)
Residential mortgage-backed securities | Fixed rate | Agency-issued collateralized mortgage obligations    
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Fair Value of Investments, Less than 12 months 0 16,952
Unrealized Losses, Less than 12 months 0 (109)
Fair Value of Investments, 12 months or longer 2,002,038 2,103,980
Unrealized Losses, 12 months or longer (40,414) (62,163)
Fair Value of Investments 2,002,038 2,120,932
Unrealized Losses (40,414) (62,272)
Residential mortgage-backed securities | Variable rate | Agency-issued collateralized mortgage obligations    
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Fair Value of Investments, Less than 12 months 162,374 3,364
Unrealized Losses, Less than 12 months (720) (1)
Fair Value of Investments, 12 months or longer 7,837 8,101
Unrealized Losses, 12 months or longer (7) (13)
Fair Value of Investments 170,211 11,465
Unrealized Losses (727) (14)
Agency-issued commercial mortgage-backed securities    
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Fair Value of Investments, Less than 12 months 48,634 177,697
Unrealized Losses, Less than 12 months (70) (1,580)
Fair Value of Investments, 12 months or longer 1,622,658 1,600,277
Unrealized Losses, 12 months or longer (53,606) (62,794)
Fair Value of Investments 1,671,292 1,777,974
Unrealized Losses (53,676) (64,374)
Municipal bonds and notes    
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Fair Value of Investments, Less than 12 months 1,485 868,751
Unrealized Losses, Less than 12 months 0 (17,075)
Fair Value of Investments, 12 months or longer 142,042 340,413
Unrealized Losses, 12 months or longer (1,274) (9,894)
Fair Value of Investments 143,527 1,209,164
Unrealized Losses $ (1,274) $ (26,969)