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Investment Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Gross Losses | $ (29,854) | $ (18,442)
Less than 12 months, Fair Value | 1,124,253 | 1,187,758
12 months or more, Unrealized Gross Losses | (63,328) | (3,851)
12 months or more, Fair Value | 1,284,504 | 394,922
Total, Unrealized Gross Losses | (93,182) | (22,293)
Total, Fair Value | 2,408,757 | 1,582,680
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Gross Losses | (929) | 0
Less than 12 months, Fair Value | 49,072 | 0
12 months or more, Unrealized Gross Losses | (14) | (577)
12 months or more, Fair Value | 24,988 | 49,423
Total, Unrealized Gross Losses | (943) | (577)
Total, Fair Value | 74,060 | 49,423
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Gross Losses | (24) |
Less than 12 months, Fair Value | 1,374 |
12 months or more, Unrealized Gross Losses | 0 |
12 months or more, Fair Value | 0 |
Total, Unrealized Gross Losses | (24) |
Total, Fair Value | 1,374 |
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Gross Losses | (141) | (759)
Less than 12 months, Fair Value | 37,565 | 24,400
12 months or more, Unrealized Gross Losses | (1,645) | (697)
12 months or more, Fair Value | 76,499 | 96,195
Total, Unrealized Gross Losses | (1,786) | (1,456)
Total, Fair Value | 114,064 | 120,595
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Gross Losses | (12) |
Less than 12 months, Fair Value | 488 |
12 months or more, Unrealized Gross Losses | 0 |
12 months or more, Fair Value | 0 |
Total, Unrealized Gross Losses | (12) |
Total, Fair Value | 488 |
Agency pass-through certificates |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Gross Losses | (28,748) | (17,683)
Less than 12 months, Fair Value | 1,035,754 | 1,163,358
12 months or more, Unrealized Gross Losses | (61,669) | (2,577)
12 months or more, Fair Value | 1,183,017 | 249,304
Total, Unrealized Gross Losses | (90,417) | (20,260)
Total, Fair Value | $ 2,218,771 | $ 1,412,662

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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 No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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