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Investment Securities - Securities in Continuous Loss Position (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]    
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months $ (812) $ (83,095)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months 360,665 2,065,491
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer (57,353) (1,711)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 1,642,718 190,357
Unrealized gross losses of AFS securities, continuous unrealized loss position (58,165) (84,806)
Fair value of AFS securities, continuous unrealized loss position 2,003,383 2,255,848
Corporate debt securities
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months (125) (660)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months 24,875 52,434
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer (845) (238)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 24,155 9,763
Unrealized gross losses of AFS securities, continuous unrealized loss position (970) (898)
Fair value of AFS securities, continuous unrealized loss position 49,030 62,197
U.S. agency securities
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months (472) (4,144)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months 316,578 309,109
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer (797) (66)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 109,354 14,091
Unrealized gross losses of AFS securities, continuous unrealized loss position (1,269) (4,210)
Fair value of AFS securities, continuous unrealized loss position 425,932 323,200
Agency pass through mortgage-backed securities
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months (215) (78,291)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months 19,212 1,703,948
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer (55,711) (1,407)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 1,509,209 166,503
Unrealized gross losses of AFS securities, continuous unrealized loss position (55,926) (79,698)
Fair value of AFS securities, continuous unrealized loss position $ 1,528,421 $ 1,870,451