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Investment Securities - Securities in Continuous Loss Position (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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