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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Fair value of assets measured on recurring basis | The following table presents the balance and level in the fair value hierarchy for assets and liabilities that are measured at fair value on a recurring basis.
| September 30, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |
Equity securities | $ | 522 |  |  | $ | — |  |  | $ | — |  |  | $ | 522 |
U.S. government and agency securities | — |  |  | 211,077 |  |  | — |  |  | 211,077 |
Municipal bonds | — |  |  | 26,624 |  |  | — |  |  | 26,624 |
Corporate debt securities | — |  |  | 185,298 |  |  | — |  |  | 185,298 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |
Agency pass-through certificates | — |  |  | 834,297 |  |  | — |  |  | 834,297 |
Commercial MBS | — |  |  | 8,391 |  |  | — |  |  | 8,391 |
Total Available-for-sale securities | 522 |  |  | 1,265,687 |  |  | — |  |  | 1,266,209 |
Interest rate contracts | — |  |  | 1,139 |  |  | — |  |  | 1,139 |
Total Financial Assets | $ | 522 |  |  | $ | 1,266,826 |  |  | $ | — |  |  | $ | 1,267,348 |
Financial Liabilities |  |  |  |  |  |  |
Interest rate contracts | $ | — |  |  | $ | 1,139 |  |  | $ | — |  |  | $ | 1,139 |
Commercial loan hedges | — |  |  | 174 |  |  | — |  |  | 174 |
Long term borrowing hedges | — |  |  | 1,693 |  |  | — |  |  | 1,693 |
Total Financial Liabilities | $ | — |  |  | $ | 3,006 |  |  | $ | — |  |  | $ | 3,006 |
There were no transfers between, into and/or out of Levels 1, 2 or 3 during the year ended September 30, 2017.
| September 30, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |
Equity securities | $ | 101,824 |  |  | $ | — |  |  | $ | — |  |  | $ | 101,824 |
U.S. government and agency securities | — |  |  | 259,351 |  |  | — |  |  | 259,351 |
Municipal bonds | — |  |  | 27,670 |  |  | — |  |  | 27,670 |
Corporate debt securities | — |  |  | 461,138 |  |  | — |  |  | 461,138 |
Mortgage-backed securities |  |  |  |  |  |  |
Agency pass-through certificates | — |  |  | 993,041 |  |  | — |  |  | 993,041 |
Commercial MBS | — |  |  | 79,870 |  |  | — |  |  | 79,870 |
Total Available-for-sale securities | 101,824 |  |  | 1,821,070 |  |  | — |  |  | 1,922,894 |
Interest rate contracts | — |  |  | 20,895 |  |  | — |  |  | 20,895 |
Total Financial Assets | $ | 101,824 |  |  | $ | 1,841,965 |  |  | $ | — |  |  | $ | 1,943,789 |
Financial Liabilities |  |  |  |  |  |  |
Interest rate contracts | $ | — |  |  | $ | 20,895 |  |  | $ | — |  |  | $ | 20,895 |
Commercial loan hedges | — |  |  | 3,312 |  |  | — |  |  | 3,312 |
Long term borrowing hedges | — |  |  | 31,347 |  |  | — |  |  | 31,347 |
Total Financial Liabilities | $ | — |  |  | $ | 55,554 |  |  | $ | — |  |  | $ | 55,554 |
There were no transfers between, into and/or out of Level 1, 2 or 3 during the year ended September 30, 2016.
Aggregated balance of assets measured at estimated fair value on a nonrecurring basis and total losses resulting from those fair value adjustments | The following table presents the recorded balance of assets that were measured at estimated fair value on a nonrecurring basis for the periods presented, and the total gains (losses) resulting from those fair value adjustments for the periods presented. These estimated fair values are shown gross of estimated selling costs:
| September 30, 2017 |  | Three Months Ended September 30, 2017 |  | Twelve Months Ended September 30, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Total Gains (Losses)
| (In thousands) |  |
Impaired loans (1) | $ | — |  |  | $ | — |  |  | $ | 9,088 |  |  | $ | 9,088 |  |  | $ | (250 | ) |  | $ | (1,916 | )
Real estate owned (2) | — |  |  | — |  |  | 12,662 |  |  | 12,662 |  |  | (376 | ) |  | (1,463 | )
Balance at end of period | $ | — |  |  | $ | — |  |  | $ | 21,750 |  |  | $ | 21,750 |  |  | $ | (626 | ) |  | $ | (3,379 | )
___________________
(1) | The gains (losses) represent remeasurements of collateral-dependent impaired loans.
(2) | The gains (losses) represent aggregate writedowns and charge-offs on real estate owned.
| September 30, 2016 |  | Three Months Ended September 30, 2016 |  | Twelve Months Ended September 30, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Total Gains (Losses)
| (In thousands) |  |
Impaired loans (1) | $ | — |  |  | $ | — |  |  | $ | 17,476 |  |  | $ | 17,476 |  |  | $ | (474 | ) |  | $ | (4,236 | )
Real estate owned (2) | — |  |  | — |  |  | 25,190 |  |  | 25,190 |  |  | (1,003 | ) |  | (3,947 | )
Balance at end of period | $ | — |  |  | $ | — |  |  | $ | 42,666 |  |  | $ | 42,666 |  |  | $ | (1,477 | ) |  | $ | (8,183 | )
___________________
(1) | The gains (losses) represent remeasurements of collateral-dependent impaired loans.
(2) | The gains (losses) represent aggregate writedowns and charge-offs on real estate owned.
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, 2017 |  | September 30, 2016
| Level | Carrying Amount | Estimated Fair Value |  | Carrying Amount | Estimated Fair Value
|  | (In thousands)
Financial assets |  |  |  |  |  |
Cash and cash equivalents | 1 | $ | 313,070 |  | $ | 313,070 |  |  | $ | 450,368 |  | $ | 450,368 |
Available-for-sale securities: |  |  |  |  |  |
Equity securities | 1 | 522 |  | 522 |  |  | 101,824 |  | 101,824 |
U.S. government and agency securities | 2 | 211,077 |  | 211,077 |  |  | 259,351 |  | 259,351 |
Municipal bonds | 2 | 26,624 |  | 26,624 |  |  | 27,670 |  | 27,670 |
Corporate debt securities | 2 | 185,298 |  | 185,298 |  |  | 461,138 |  | 461,138 |
Mortgage-backed securities |  |  |  |  |  |
Agency pass-through certificates | 2 | 834,297 |  | 834,297 |  |  | 993,041 |  | 993,041 |
Commercial MBS | 2 | 8,391 |  | 8,391 |  |  | 79,870 |  | 79,870 |
Total available-for-sale securities |  | 1,266,209 |  | 1,266,209 |  |  | 1,922,894 |  | 1,922,894 |
Held-to-maturity securities: |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |
Agency pass-through certificates | 2 | 1,646,856 |  | 1,635,913 |  |  | 1,417,599 |  | 1,441,556 |
Total held-to-maturity securities |  | 1,646,856 |  | 1,635,913 |  |  | 1,417,599 |  | 1,441,556 |
Loans receivable | 3 | 10,882,622 |  | 11,247,586 |  |  | 9,910,920 |  | 10,414,794 |
FDIC indemnification asset | 3 | 8,968 |  | 8,564 |  |  | 12,769 |  | 12,095 |
FHLB and FRB stock | 2 | 122,990 |  | 122,990 |  |  | 117,205 |  | 117,205 |
Other assets - interest rate contracts | 2 | 1,139 |  | 1,139 |  |  | 20,895 |  | 20,895 |
Financial liabilities |  |  |  |  |  |
Customer accounts | 2 | 10,835,008 |  | 10,411,686 |  |  | 10,600,852 |  | 10,184,321 |
FHLB advances and other borrowings | 2 | 2,225,000 |  | 2,266,791 |  |  | 2,080,000 |  | 2,184,671 |
Other liabilities - interest rate contracts | 2 | 1,139 |  | 1,139 |  |  | 20,895 |  | 20,895 |
Other liabilities - commercial loan hedges | 2 | 174 |  | 174 |  |  | 3,312 |  | 3,312 |
Other liabilities - long term borrowing hedges | 2 | 1,693 |  | 1,693 |  |  | 31,347 |  | 31,347 |
The following table presents the fair value and balance sheet classification of derivatives outstanding.
|  | Asset Derivatives |  | Liability Derivatives
|  | September 30, 2017 |  | September 30, 2016 |  | September 30, 2017 |  | September 30, 2016
(In thousands) |  | Balance Sheet |  | Fair Value |  | Balance Sheet |  | Fair Value |  | Balance Sheet |  | Fair Value |  | Balance Sheet |  | Fair Value
Interest rate contracts |  | Other assets |  | $ | 1,139 |  |  | Other assets |  | $ | 20,895 |  |  | Other liabilities |  | $ | 1,139 |  |  | Other liabilities |  | $ | 20,895 |
Commercial loan hedges |  | Other assets |  | — |  |  | Other assets |  | — |  |  | Other liabilities |  | 174 |  |  | Other liabilities |  | 3,312 |
Long term borrowing hedges |  | Other assets |  | — |  |  | Other assets |  | — |  |  | Other liabilities |  | 1,693 |  |  | Other liabilities |  | 31,347 |
|  |  |  | $ | 1,139 |  |  |  |  | $ | 20,895 |  |  |  |  | $ | 3,006 |  |  |  |  | $ | 55,554 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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