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Derivatives and Hedging Activities (Tables) | 12 Months Ended
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Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair value of financial instruments by balance sheet grouping | Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below.
|  | September 30, 2018 |  | September 30, 2017
| Level | Carrying Amount | Estimated Fair Value |  | Carrying Amount | Estimated Fair Value
|  | (In thousands)
Financial assets |  |  |  |  |  |
Cash and cash equivalents | 1 | $ | 268,650 |  | $ | 268,650 |  |  | $ | 313,070 |  | $ | 313,070 |
Available-for-sale securities: |  |  |  |  |  |
Equity securities | 1 | 488 |  | 488 |  |  | 522 |  | 522 |
U.S. government and agency securities | 2 | 207,293 |  | 207,293 |  |  | 211,077 |  | 211,077 |
Municipal bonds | 2 | 22,978 |  | 22,978 |  |  | 26,624 |  | 26,624 |
Corporate debt securities | 2 | 184,695 |  | 184,695 |  |  | 185,298 |  | 185,298 |
Mortgage-backed securities |  |  |  |  |  |
Agency pass-through certificates | 2 | 896,041 |  | 896,041 |  |  | 834,297 |  | 834,297 |
Commercial MBS | 2 | 3,462 |  | 3,462 |  |  | 8,391 |  | 8,391 |
Total available-for-sale securities |  | 1,314,957 |  | 1,314,957 |  |  | 1,266,209 |  | 1,266,209 |
Held-to-maturity securities: |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |
Agency pass-through certificates | 2 | 1,610,420 |  | 1,533,742 |  |  | 1,646,856 |  | 1,635,913 |
Other debt securities |  | 15,000 |  | 15,028 |  |  | — |  | — |
Total held-to-maturity securities |  | 1,625,420 |  | 1,548,770 |  |  | 1,646,856 |  | 1,635,913 |
Loans receivable | 3 | 11,477,081 |  | 11,556,325 |  |  | 10,882,622 |  | 11,247,586 |
FHLB and FRB stock | 2 | 127,190 |  | 127,190 |  |  | 122,990 |  | 122,990 |
Other assets - interest rate contracts | 2 | 12,731 |  | 12,731 |  |  | 1,139 |  | 1,139 |
Other assets - commercial loan hedges | 2 | 3,857 |  | 3,857 |  |  | — |  | — |
Other assets - borrowing hedges | 2 | 22,250 |  | 22,250 |  |  | — |  | — |
Financial liabilities |  |  |  |  |  |
Customer accounts | 2 | 11,387,146 |  | 10,882,862 |  |  | 10,835,008 |  | 10,411,686 |
FHLB advances and other borrowings | 2 | 2,330,000 |  | 2,316,964 |  |  | 2,225,000 |  | 2,266,791 |
Other liabilities - interest rate contracts | 2 | 12,731 |  | 12,731 |  |  | 1,139 |  | 1,139 |
Other liabilities - commercial loan hedges | 2 | — |  | — |  |  | 174 |  | 174 |
Other liabilities - long term borrowing hedges | 2 | — |  | — |  |  | 1,693 |  | 1,693 |
The following table presents the fair value and balance sheet classification of derivatives outstanding.
|  | Asset Derivatives |  | Liability Derivatives
|  | September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
(In thousands) |  | Balance Sheet |  | Fair Value |  | Balance Sheet |  | Fair Value |  | Balance Sheet |  | Fair Value |  | Balance Sheet |  | Fair Value
Interest rate contracts |  | Other assets |  | $ | 12,731 |  |  | Other assets |  | $ | 1,139 |  |  | Other liabilities |  | $ | 12,731 |  |  | Other liabilities |  | $ | 1,139 |
Commercial loan hedges |  | Other assets |  | 3,857 |  |  | Other assets |  | — |  |  | Other liabilities |  | — |  |  | Other liabilities |  | 174 |
Borrowing hedges |  | Other assets |  | 22,250 |  |  | Other assets |  | — |  |  | Other liabilities |  | — |  |  | Other liabilities |  | 1,693 |
|  |  |  | $ | 38,838 |  |  |  |  | $ | 1,139 |  |  |  |  | $ | 12,731 |  |  |  |  | $ | 3,006 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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