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Derivatives and Hedging Activities (Tables) | 6 Months Ended
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Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Fair Value and Balance Sheet Classification | 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.
|  |  |  | March 31, 2017 |  | September 30, 2016
|  | Level in Fair Value Hierarchy |  | Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
|  |  |  | (In thousands)
Financial assets |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 1 |  | $ | 266,397 |  |  | $ | 266,397 |  |  | $ | 450,368 |  |  | $ | 450,368 |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |
Equity securities |  | 1 |  | 522 |  |  | 522 |  |  | 101,824 |  |  | 101,824 |
U.S. government and agency securities |  | 2 |  | 235,618 |  |  | 235,618 |  |  | 259,351 |  |  | 259,351 |
Municipal bonds |  | 2 |  | 26,654 |  |  | 26,654 |  |  | 27,670 |  |  | 27,670 |
Corporate debt securities |  | 2 |  | 209,981 |  |  | 209,981 |  |  | 461,138 |  |  | 461,138 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |
Agency pass-through certificates |  | 2 |  | 863,032 |  |  | 863,032 |  |  | 993,041 |  |  | 993,041 |
Commercial MBS |  | 2 |  | 52,975 |  |  | 52,975 |  |  | 79,870 |  |  | 79,870 |
Total available-for-sale securities |  |  |  | 1,388,782 |  |  | 1,388,782 |  |  | 1,922,894 |  |  | 1,922,894 |
Held-to-maturity securities |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |
Agency pass-through certificates |  | 2 |  | 1,697,650 |  |  | 1,668,548 |  |  | 1,417,599 |  |  | 1,441,556 |
Total held-to-maturity securities |  |  |  | 1,697,650 |  |  | 1,668,548 |  |  | 1,417,599 |  |  | 1,441,556 |
Loans receivable |  | 3 |  | 10,463,022 |  |  | 10,732,868 |  |  | 9,910,920 |  |  | 10,414,794 |
FDIC indemnification asset |  | 3 |  | 11,821 |  |  | 11,342 |  |  | 12,769 |  |  | 12,095 |
FHLB and FRB stock |  | 2 |  | 119,990 |  |  | 119,990 |  |  | 117,205 |  |  | 117,205 |
Other assets - interest rate contracts |  | 2 |  | 4,060 |  |  | 4,060 |  |  | 20,895 |  |  | 20,895 |
Other assets - commercial loan hedges |  | 2 |  | 175 |  |  | 175 |  |  | — |  |  | — |
Other assets - borrowings hedges |  | 2 |  | 319 |  |  | 319 |  |  | — |  |  | — |
Financial liabilities |  |  |  |  |  |  |  |  |  |
Customer accounts |  | 2 |  | 10,630,807 |  |  | 10,104,720 |  |  | 10,600,852 |  |  | 10,184,321 |
FHLB advances |  | 2 |  | 2,150,000 |  |  | 2,212,968 |  |  | 2,080,000 |  |  | 2,184,671 |
Other liabilities - interest rate contracts |  | 2 |  | 4,060 |  |  | 4,060 |  |  | 20,895 |  |  | 20,895 |
Other liabilities - commercial loan hedges |  | 2 |  | — |  |  | — |  |  | 3,312 |  |  | 3,312 |
Other liabilities - borrowings hedges |  | 2 |  | — |  |  | — |  |  | 31,347 |  |  | 31,347 |
The following table presents the fair value and balance sheet classification of derivatives at March 31, 2017 and September 30, 2016:
|  | Asset Derivatives |  | Liability Derivatives
|  | March 31, 2017 |  | September 30, 2016 |  | March 31, 2017 |  | September 30, 2016
|  | Balance Sheet |  |  |  | Balance Sheet |  |  |  | Balance Sheet |  |  |  | Balance Sheet |  |
|  | Location |  | Fair Value |  | Location |  | Fair Value |  | Location |  | Fair Value |  | Location |  | Fair Value
|  | (In thousands)
Interest rate contracts |  | Other assets |  | $ | 4,060 |  |  | Other assets |  | $ | 20,895 |  |  | Other liabilities |  | $ | 4,060 |  |  | Other liabilities |  | $ | 20,895 |
Commercial loan hedges |  | Other assets |  | 175 |  |  | Other assets |  | — |  |  | Other liabilities |  | — |  |  | Other liabilities |  | 3,312 |
Borrowings hedges |  | Other assets |  | 319 |  |  | Other assets |  | — |  |  | Other liabilities |  | — |  |  | Other liabilities |  | 31,347 |
|  |  |  | $ | 4,554 |  |  |  |  | $ | 20,895 |  |  |  |  | $ | 4,060 |  |  |  |  | $ | 55,554 |

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