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Investment Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months | $ (18,442) | $ (1,289)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months | 1,187,758 | 304,197
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer | (3,851) | (10,637)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer | 394,922 | 553,487
Unrealized gross losses of AFS securities, continuous unrealized loss position | (22,293) | (11,926)
Fair value of AFS securities, continuous unrealized loss position | 1,582,680 | 857,684
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 | 0 | 0
Fair value of AFS securities, continuous unrealized loss position, less than 12 months | 0 | 0
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer | (577) | (2,582)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer | 49,423 | 100,467
Unrealized gross losses of AFS securities, continuous unrealized loss position | (577) | (2,582)
Fair value of AFS securities, continuous unrealized loss position | 49,423 | 100,467
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 | (759) | (11)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months | 24,400 | 3,167
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer | (697) | (5,638)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer | 96,195 | 220,613
Unrealized gross losses of AFS securities, continuous unrealized loss position | (1,456) | (5,649)
Fair value of AFS securities, continuous unrealized loss position | 120,595 | 223,780
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 | (17,683) | (1,278)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months | 1,163,358 | 301,030
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer | (2,577) | (2,417)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer | 249,304 | 232,407
Unrealized gross losses of AFS securities, continuous unrealized loss position | (20,260) | (3,695)
Fair value of AFS securities, continuous unrealized loss position | $ 1,412,662 | $ 533,437

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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=82897076&loc=d3e27290-111563 Reference 2: 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=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + 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=82897076&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=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: 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=82897076&loc=d3e27337-111563 + Details
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