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Investment Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, unrealized gross losses | $ (804) | $ (29,854)
Less than 12 months, fair value | 240,610 | 1,124,253
12 months or more, unrealized gross losses | (2,323) | (63,328)
12 months or more, fair value | 373,143 | 1,284,504
Total, unrealized gross losses | (3,127) | (93,182)
Total, fair value | 613,753 | 2,408,757
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, unrealized gross losses | 0 | (929)
Less than 12 months, fair value | 0 | 49,072
12 months or more, unrealized gross losses | (50) | (14)
12 months or more, fair value | 24,950 | 24,988
Total, unrealized gross losses | (50) | (943)
Total, fair value | 24,950 | 74,060
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 | (656) | (141)
Less than 12 months, fair value | 152,715 | 37,565
12 months or more, unrealized gross losses | (960) | (1,645)
12 months or more, fair value | 77,391 | 76,499
Total, unrealized gross losses | (1,616) | (1,786)
Total, fair value | 230,106 | 114,064
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
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, unrealized gross losses | (148) | (28,748)
Less than 12 months, fair value | 87,895 | 1,035,754
12 months or more, unrealized gross losses | (1,313) | (61,669)
12 months or more, fair value | 270,802 | 1,183,017
Total, unrealized gross losses | (1,461) | (90,417)
Total, fair value | $ 358,697 | $ 2,218,771

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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