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Fair Value Measurements (Tables)
3 Months Ended
Dec. 31, 2021
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 of assets and liabilities that are measured at fair value on a recurring basis.
 December 31, 2021
 Level 1Level 2Level 3Total
 (In thousands)
Financial Assets
Available-for-sale securities:
U.S. government and agency securities$— $57,567 $— $57,567 
Asset-backed securities— 959,894 — 959,894 
Municipal bonds— 40,149 — 40,149 
Corporate debt securities— 348,186 — 348,186 
Mortgage-backed securities
Agency pass-through certificates— 540,343 — 540,343 
Total available-for-sale securities— 1,946,139 — 1,946,139 
Client swap program hedges— 5,944 — 5,944 
Mortgage loan fair value hedges— 2,632 — 2,632 
Borrowings cash flow hedges— 48,888 — 48,888 
Total financial assets$— $2,003,603 $— $2,003,603 
Financial Liabilities
Client swap program hedges$— $5,944 $— $5,944 
Commercial loan fair value hedges— 1,951 — 1,951 
Total financial liabilities$— $7,895 $— $7,895 
 September 30, 2021
 Level 1Level 2Level 3Total
 (In thousands)
Financial Assets
Available-for-sale securities:
U.S. government and agency securities$— $61,779 $— $61,779 
Asset-backed securities— 1,078,681 1,078,681 
Municipal bonds— 39,984 — 39,984 
Corporate debt securities— 350,988 — 350,988 
Mortgage-backed securities
Agency pass-through certificates— 606,827 — 606,827 
Total available-for-sale securities— 2,138,259 — 2,138,259 
Client swap program hedges— 10,983 — 10,983 
Borrowings cash flow hedges— 42,442 — 42,442 
Total financial assets$— $2,191,684 $— $2,191,684 
Financial Liabilities
Client swap program hedges$— $10,983 $— $10,983 
Commercial loan fair value hedges— 2,177 — 2,177 
Mortgage loan fair value hedges1,641 1,641 
Total financial liabilities$— $14,801 $— $14,801 
Fair Value of Assets Measured on Nonrecurring Basis
The following tables present the aggregated balance of assets that were measured at fair value on a nonrecurring basis at December 31, 2021 and December 31, 2020, 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.
 
 December 31, 2021Three Months Ended December 31, 2021
 Level 1Level  2Level  3TotalTotal Gains (Losses)
 (In thousands)(In thousands)
Loans (1)$— $— $202 $202 $(89)
Real estate owned (2)— — 1,390 1,390 (504)
Balance at end of period$— $— $1,592 $1,592 $(593)

(1)The gains (losses) represent re-measurements of collateral-dependent loans.
(2)The gains (losses) represent aggregate write-downs and charge-offs on real estate owned.
December 31, 2020Three Months Ended December 31, 2020
Level 1Level  2Level  3TotalTotal Gains (Losses)
(In thousands)(In thousands)
Loans (1)$— $— $— $— $(44)
Real estate owned (2)— — 447 447 (47)
Balance at end of period$— $— $447 $447 $(91)

(1)The gains (losses) represent re-measurements of collateral-dependent 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.
 December 31, 2021September 30, 2021
 Level in Fair Value HierarchyCarrying
Amount
Estimated
Fair Value
Carrying
Amount
Estimated
Fair Value
 ($ in thousands)
Financial assets
Cash and cash equivalents1$1,880,647 $1,880,647 $2,090,809 $2,090,809 
Available-for-sale securities
U.S. government and agency securities257,567 57,567 61,779 61,779 
Asset-backed securities2959,894 959,894 1,078,681 1,078,681 
Municipal bonds240,149 40,149 39,984 39,984 
Corporate debt securities2348,186 348,186 350,988 350,988 
Mortgage-backed securities
Agency pass-through certificates2540,343 540,343 606,827 606,827 
Total available-for-sale securities1,946,139 1,946,139 2,138,259 2,138,259 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates2326,387 335,895 366,025 379,547 
Total held-to-maturity securities326,387 335,895 366,025 379,547 
Loans receivable314,592,202 14,991,699 13,833,570 14,279,725 
FHLB and FRB stock2102,863 102,863 102,863 102,863 
        Other assets - client swap program hedges25,944 5,944 10,983 10,983 
        Other assets - mortgage loan fair value hedges22,632 2,632 — — 
        Other assets - borrowings cash flow hedges248,888 48,888 42,442 42,442 
Financial liabilities
Time deposits23,351,984 3,307,120 3,434,087 3,382,206 
FHLB advances21,720,000 1,672,238 1,720,000 1,692,412 
        Other liabilities - client swap program hedges25,944 5,944 10,983 10,983 
Other liabilities - commercial loan fair value hedges21,951 1,951 2,177 2,177 
Other liabilities - mortgage loan fair value hedges2— — 1,641 1,641 
Reconciliation of Amortized Cost to Fair Value of Available-for-Sale and Held-to-Maturity Securities The following tables provide details about the amortized cost and fair value of available-for-sale and held-to-maturity securities.
 December 31, 2021
 Amortized
Cost
Gross UnrealizedFair
Value
Yield
 GainsLosses
 ($ in thousands)
Available-for-sale securities
U.S. government and agency securities due
1 to 5 years$57,562 $93 $(88)$57,567 0.86 %
Asset-backed securities
1 to 5 years19,280 — (471)18,809 0.83 
5 to 10 years66,245 290 (138)66,397 0.58 
Over 10 years867,872 7,206 (390)874,688 0.97 
Corporate debt securities due
1 to 5 years226,048 6,355 — 232,403 1.59 
5 to 10 years86,475 409 — 86,884 4.64 
Over 10 years28,833 66 — 28,899 1.95 
Municipal bonds due
Within 1 year1,501 10 — 1,511 — 
5 to 10 years5,774 226 — 6,000 0.22 
Over 10 years29,900 2,738 — 32,638 5.85 
Mortgage-backed securities
Agency pass-through certificates525,179 17,984 (2,820)540,343 2.57 
1,914,669 35,377 (3,907)1,946,139 1.72 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates326,387 9,508 — 335,895 3.17 
326,387 9,508 — 335,895 3.17 
$2,241,056 $44,885 $(3,907)$2,282,034 1.91 %
 
 September 30, 2021
 Amortized
Cost
Gross UnrealizedFair
Value
Yield
 GainsLosses
 ($ in thousands)
Available-for-sale securities
U.S. government and agency securities due
1 to 5 years$47,339 $240 $— $47,579 0.44 %
5 to 10 years14,064 136 — 14,200 2.05 
Asset-backed securities
1 to 5 years19,730 — (434)19,296 0.52 
5 to 10 years71,207 412 (97)71,522 0.57 
Over 10 years973,892 14,069 (98)987,863 0.94 
Corporate debt securities due
Within 1 year225,928 7,860 — 233,788 1.57 
1 to 5 years86,802 1,345 — 88,147 4.64 
5 to 10 years28,804 249 — 29,053 1.95 
Municipal bonds due
Within 1 year1,493 17 — 1,510 — 
5 to 10 years5,781 294 — 6,075 0.22 
Over 10 years29,909 2,490 — 32,399 5.85 
Mortgage-backed securities
Agency pass-through certificates585,121 23,717 (2,011)606,827 2.60 
2,090,070 50,829 (2,640)2,138,259 1.69 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates366,025 13,522 — 379,547 3.17 
366,025 13,522 — 379,547 3.17 
$2,456,095 $64,351 $(2,640)$2,517,806 1.89 %
Schedule of Unrealized Losses and Fair Value of Securities The following tables show the gross unrealized losses and fair value of securities as of December 31, 2021 and September 30, 2021, by length of time that individual securities in each category have been in a continuous loss position. There were 36 and 31 securities with an unrealized loss as of December 31, 2021 and September 30, 2021, respectively. The decline in fair value since purchase is attributable to changes in interest rates. Because the Company does not intend to sell these securities and does
not consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to have any credit impairment.
 
December 31, 2021Less than 12 months12 months or moreTotal
 Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
 (In thousands)
Available-for-sale securities
U.S. government and agency securities$(88)$13,970 $— $— $(88)$13,970 
Asset-backed securities(144)71,099 (855)87,409 (999)158,508 
Mortgage-backed securities(755)56,773 (2,065)52,747 (2,820)109,520 
(987)141,842 (2,920)140,156 (3,907)281,998 
Held-to-maturity securities
Mortgage-backed securities— — — — — — 
$(987)$141,842 $(2,920)$140,156 $(3,907)$281,998 

September 30, 2021Less than 12 months12 months or moreTotal
 Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
 (In thousands)
Available-for-sale securities
Asset-backed securities$(15)$4,639 $(614)$70,058 $(629)$74,697 
Mortgage-backed securities(1,569)47,758 (442)32,266 (2,011)80,024 
(1,584)52,397 (1,056)102,324 (2,640)154,721 
Held-to-maturity securities
Mortgage-backed securities— — — — — — 
$(1,584)$52,397 $(1,056)$102,324 $(2,640)$154,721