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Investment Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months $ (6,229) $ (812)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months 578,646 360,665
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer (23,128) (57,353)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 1,297,408 1,642,718
Unrealized gross losses of AFS securities, continuous unrealized loss position (29,357) (58,165)
Fair value of AFS securities, continuous unrealized loss position 1,876,054 2,003,383
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 (183) (125)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months 72,862 24,875
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer (3,399) (845)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 46,601 24,155
Unrealized gross losses of AFS securities, continuous unrealized loss position (3,582) (970)
Fair value of AFS securities, continuous unrealized loss position 119,463 49,030
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 (5,010) (472)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months 336,243 316,578
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer (1,452) (797)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 57,344 109,354
Unrealized gross losses of AFS securities, continuous unrealized loss position (6,462) (1,269)
Fair value of AFS securities, continuous unrealized loss position 393,587 425,932
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 (1,036) (215)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months 169,541 19,212
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer (18,277) (55,711)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 1,193,463 1,509,209
Unrealized gross losses of AFS securities, continuous unrealized loss position (19,313) (55,926)
Fair value of AFS securities, continuous unrealized loss position $ 1,363,004 $ 1,528,421