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Investment Securities (Tables)
 12 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments by Contractual Maturity Date The tables below provide detail regarding the amortized cost and fair value of available-for-sale and held-to-maturity investment securities.
September 30, 2023Amortized
Cost		Gross Unrealized    Fair
Value		Yield
GainsLosses
 ($ in thousands)
Available-for-sale securities
U.S. government and agency securities due
Within 1 year$3,501 $— $(36)$3,465 6.06 %
1 to 5 years18,894 — (563)18,331 4.70 
5 to 10 years87,922 177 — 88,099 5.76 
Over 10 years106,340 831 (13)107,158 5.84 
Asset-backed securities due
1 to 5 years18,579 — (715)17,864 6.06 
5 to 10 years36,875 2 (99)36,778 6.11 
  Over 10 years539,911 578 (7,115)533,374 6.35 
Corporate debt securities due
1 to 5 years151,893 895 (1,787)151,001 5.14 
5 to 10 years113,221 — (21,700)91,521 3.87 
Municipal bonds due
5 to 10 years5,720 — (701)5,019 3.00 
  Over 10 years29,832 361 (550)29,643 5.85 
Mortgage-backed securities
Agency pass-through certificates1,005,928 66 (93,150)912,844 3.39 
2,118,616 2,910 (126,429)1,995,097 4.64 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates423,586 — (68,398)355,188 2.88 
423,586 — (68,398)355,188 2.88 
$2,542,202 $2,910 $(194,827)$2,350,285 4.35 %
 
September 30, 2022Amortized
Cost		Gross UnrealizedFair
Value		Yield
GainsLosses
 ($ in thousands)
Available-for-sale securities
U.S. government and agency securities due
1 to 5 years$40,403 $— $(1,049)$39,354 3.03 %
Asset-backed securities due
1 to 5 years22,527 — (1,141)21,386 3.27 
5 to 10 years82,962 4 (547)82,419 3.53 
Over 10 years668,482 783 (6,069)663,196 3.86 
Corporate debt securities due
Within 1 year75,000 4 (200)74,804 3.74 
1 to 5 years151,411 — (2,748)148,663 3.59 
5 to 10 years114,414 — (24,124)90,290 3.87 
Municipal bonds due
5 to 10 years5,751 — (361)5,390 3.00 
  Over 10 years29,871 400 (699,000)29,572 5.85 
Mortgage-backed securities
Agency pass-through certificates971,916 117 (76,070)895,963 2.81 
2,162,737 1,308 (113,008)2,051,037 3.36 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates463,299 22 (56,461)406,860 2.88 
463,299 22 (56,461)406,860 2.88 
$2,626,036 $1,330 $(169,469)$2,457,897 3.28 %
Schedule of Unrealized Losses and Fair Value of Securities The following tables show the gross unrealized losses and fair value of securities as of September 30, 2023 and September 30, 2022, by length of time that individual securities in each category have been in a continuous loss position. There were 232 and 223 securities with an unrealized loss as of September 30, 2023 and September 30, 2022, respectively. The decline in fair value since purchase is attributable to changes in interest rates. Because the Company does not intend to sell these securities and does not consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be impaired.
September 30, 2023Less than 12 months12 months or moreTotal
 Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value
 (In thousands)
Available-for-sale securities
Corporate debt securities$— $— $(23,487)$167,452 $(23,487)$167,452 
Municipal bonds— — (1,250)14,302 (1,250)14,302 
U.S. government and agency securities(13)14,917 (599)21,795 (612)36,712 
Asset-backed securities(2,142)86,800 (5,788)445,454 (7,930)532,254 
Mortgage-backed securities(2,030)142,235 (91,120)744,010 (93,150)886,245 
(4,185)243,952 (122,244)1,393,013 (126,429)1,636,965 
Held-to-maturity securities
Mortgage-backed securities(15)1,424 (68,383)353,764 (68,398)355,188 
$(4,200)$245,376 $(190,627)$1,746,777 $(194,827)$1,992,153 
September 30, 2022Less than 12 months12 months or moreTotal
 Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value
 (In thousands)
Available-for-sale securities
Corporate debt securities$(27,072)$288,753 $— $— $(27,072)$288,753 
Municipal bonds due(1,061)14,561 — — (1,061)14,561 
U.S. government and agency securities(1,049)39,354 — — (1,049)39,354 
Asset-backed securities(6,374)601,248 (1,383)50,070 (7,757)651,318 
Mortgage-backed securities(63,738)833,683 (12,331)53,533 (76,069)887,216 
(99,294)1,777,599 (13,714)103,603 (113,008)1,881,202 
Held-to-maturity securities
Mortgage-backed securities(56,461)405,166 — — (56,461)405,166 
$(155,755)$2,182,765 $(13,714)$103,603 $(169,469)$2,286,368 
Schedule of Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Fair Value The following tables show the gross unrealized losses and fair value of securities as of September 30, 2023 and September 30, 2022, by length of time that individual securities in each category have been in a continuous loss position. There were 232 and 223 securities with an unrealized loss as of September 30, 2023 and September 30, 2022, respectively. The decline in fair value since purchase is attributable to changes in interest rates. Because the Company does not intend to sell these securities and does not consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be impaired.
September 30, 2023Less than 12 months12 months or moreTotal
 Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value
 (In thousands)
Available-for-sale securities
Corporate debt securities$— $— $(23,487)$167,452 $(23,487)$167,452 
Municipal bonds— — (1,250)14,302 (1,250)14,302 
U.S. government and agency securities(13)14,917 (599)21,795 (612)36,712 
Asset-backed securities(2,142)86,800 (5,788)445,454 (7,930)532,254 
Mortgage-backed securities(2,030)142,235 (91,120)744,010 (93,150)886,245 
(4,185)243,952 (122,244)1,393,013 (126,429)1,636,965 
Held-to-maturity securities
Mortgage-backed securities(15)1,424 (68,383)353,764 (68,398)355,188 
$(4,200)$245,376 $(190,627)$1,746,777 $(194,827)$1,992,153 
September 30, 2022Less than 12 months12 months or moreTotal
 Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value
 (In thousands)
Available-for-sale securities
Corporate debt securities$(27,072)$288,753 $— $— $(27,072)$288,753 
Municipal bonds due(1,061)14,561 — — (1,061)14,561 
U.S. government and agency securities(1,049)39,354 — — (1,049)39,354 
Asset-backed securities(6,374)601,248 (1,383)50,070 (7,757)651,318 
Mortgage-backed securities(63,738)833,683 (12,331)53,533 (76,069)887,216 
(99,294)1,777,599 (13,714)103,603 (113,008)1,881,202 
Held-to-maturity securities
Mortgage-backed securities(56,461)405,166 — — (56,461)405,166 
$(155,755)$2,182,765 $(13,714)$103,603 $(169,469)$2,286,368