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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair value of assets measured on recurring basis
The following tables present 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, 2020
Level 1Level 2Level 3Total
(In thousands)
Available-for-sale securities
U.S. government and agency securities$— $18,824 $— $18,824 
Asset-backed securities— 936,917 936,917 
Municipal bonds— 38,315 — 38,315 
Corporate debt securities— 287,184 — 287,184 
Mortgage-backed securities
Agency pass-through certificates— 968,252 — 968,252 
Total Available-for-sale securities— 2,249,492 — 2,249,492 
  Client swap program hedges— 48,201 — 48,201 
Total Financial Assets$— $2,297,693 $— $2,297,693 
Financial Liabilities
  Client swap program hedges$— $48,201 $— $48,201 
  Commercial loan fair value hedges— 8,492 — 8,492 
  Mortgage loan hedges— 16,061 — 16,061 
  Borrowings cash flow hedges— 17,375 — 17,375 
Total Financial Liabilities$— $90,129 $— $90,129 
There were no transfers between, into and/or out of Levels 1, 2 or 3 during the year ended September 30, 2020.
September 30, 2019
Level 1Level 2Level 3Total
(In thousands)
Available-for-sale securities
U.S. government and agency securities$— $21,088 $— $21,088 
Asset-backed securities— 249,690 — 249,690 
Municipal bonds— 22,642 — 22,642 
Corporate debt securities— 209,763 — 209,763 
Mortgage-backed securities
Agency pass-through certificates— 982,559 — 982,559 
Total Available-for-sale securities— 1,485,742 — 1,485,742 
  Client swap program hedges— 20,381 — 20,381 
  Mortgage loan fair value hedge— 1,608 — 1,608 
Total Financial Assets$— $1,507,731 $— $1,507,731 
Financial Liabilities
  Client swap program hedges$— $20,381 $— $20,381 
  Commercial loan hedges— 4,288 — 4,288 
  Borrowing hedges— 7,877 — 7,877 
Total Financial Liabilities$— $32,546 $— $32,546 
There were no transfers between, into and/or out of Level 1, 2 or 3 during the year ended September 30, 2019.
Aggregated balance of assets measured at estimated fair value on a nonrecurring basis and total losses resulting from those fair value adjustments
The following tables present the aggregated balance of assets that were measured at fair value on a nonrecurring basis for the periods presented, and the total gains (losses) resulting from those fair value adjustments during the respective periods. The estimated fair value measurements are shown gross of estimated selling costs.  

 September 30, 2020Twelve Months Ended September 30, 2020
 Level 1Level  2Level  3TotalTotal Gains (Losses)
 (In thousands)
Loans receivable (1)$— $— $2,277 $2,277 $(4,843)
Real estate owned (2)— — 4,757 4,757 (233)
Balance at end of period$— $— $7,034 $7,034 $(5,076)

(1)The gains (losses) represent re-measurements of collateral-dependent impaired loans.
(2)The gains (losses) represent aggregate write-downs and charge-offs on real estate owned.
 September 30, 2019Twelve Months Ended September 30, 2019
 Level 1Level  2Level  3TotalTotal Gains (Losses)
 (In thousands)
Impaired loans (1)$— $— $6,662 $6,662 $(7,796)
Real estate owned (2)— — 7,307 7,307 119 
Balance at end of period$— $— $13,969 $13,969 $(7,677)

(1)The gains (losses) represent re-measurements of collateral-dependent impaired loans.
(2)The gains (losses) represent aggregate write-downs 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, 2020September 30, 2019
  
LevelCarrying
Amount		Estimated
Fair Value		Carrying
Amount		Estimated
Fair Value
 (In thousands)
Financial assets
Cash and cash equivalents1$1,702,977 $1,702,977 $419,158 $419,158 
Available-for-sale securities:
U.S. government and agency securities218,824 18,824 21,088 21,088 
Asset-backed securities2936,917 936,917 249,690 249,690 
Municipal bonds238,315 38,315 22,642 22,642 
Corporate debt securities2287,184 287,184 209,763 209,763 
Mortgage-backed securities
Agency pass-through certificates2968,252 968,252 982,559 982,559 
Total available-for-sale securities2,249,492 2,249,492 1,485,742 1,485,742 
Held-to-maturity securities:
Mortgage-backed securities
Agency pass-through certificates2698,934 720,516 1,428,480 1,448,088 
Commercial MBS6,904 6,852 15,000 15,007 
Total held-to-maturity securities705,838 727,368 1,443,480 1,463,095 
Loans receivable312,792,317 13,392,089 11,930,575 12,617,600 
FHLB and FRB stock2141,990 141,990 123,990 123,990 
Other assets - client swap program hedges248,201 48,201 20,381 20,381 
Other assets - mortgage loan fair value hedges2— — 1,608 1,608 
Financial liabilities
Time deposits23,973,192 3,963,203 4,906,963 4,937,847 
FHLB advances and other borrowings22,700,000 2,722,509 2,250,000 2,282,887 
Other liabilities - client swap program hedges248,201 48,201 20,381 20,381 
Other liabilities - commercial loan fair value hedges28,492 8,492 4,288 4,288 
Other liabilities - mortgage loan fair value hedges216,061 16,061 — — 
Other liabilities - borrowings cash flow hedges217,375 17,375 7,877 7,877