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Investment Securities | 12 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | INVESTMENT SECURITIES The tables below provide detail regarding the amortized cost and fair value of available-for-sale and held-to-maturity investment securities.
September 30, 2021 | Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Yield
Gains |  | Losses |
| ($ 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 years | 14,064 |  |  | 136 |  |  | — |  |  | 14,200 |  |  | 2.05 |
Asset-backed securities |  |  |  |  |  |  |  |  |
1 to 5 years | 19,730 |  |  | — |  |  | (434) |  |  | 19,296 |  |  | 0.52 |
5 to 10 years | 71,207 |  |  | 412 |  |  | (97) |  |  | 71,522 |  |  | 0.57 |
Over 10 years | 973,892 |  |  | 14,069 |  |  | (98) |  |  | 987,863 |  |  | 0.94 |
Corporate debt securities due |  |  |  |  |  |  |  |  |
Within 1 year | 225,928 |  |  | 7,860 |  |  | — |  |  | 233,788 |  |  | 1.57 |
1 to 5 years | 86,802 |  |  | 1,345 |  |  | — |  |  | 88,147 |  |  | 4.64 |
5 to 10 years | 28,804 |  |  | 249 |  |  | — |  |  | 29,053 |  |  | 1.95 |
Municipal bonds due |  |  |  |  |  |  |  |  |
Within 1 year | 1,493 |  |  | 17 |  |  | — |  |  | 1,510 |  |  | — |
5 to 10 years | 5,781 |  |  | 294 |  |  | — |  |  | 6,075 |  |  | 0.22 |
Over 10 years | 29,909 |  |  | 2,490 |  |  | — |  |  | 32,399 |  |  | 5.85 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 585,121 |  |  | 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 certificates | 366,025 |  |  | 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 | %
September 30, 2020 | Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Yield
Gains |  | Losses |
| ($ in thousands)
Available-for-sale securities |  |  |  |  |  |  |  |  |
U.S. government and agency securities due |  |  |  |  |  |  |  |  |
5 to 10 years | $ | 18,448 |  |  | $ | 376 |  |  | $ | — |  |  | $ | 18,824 |  |  | 2.05 | %
Asset-backed securities |  |  |  |  |  |  |  |  |
5 to 10 years | 38,289 |  |  | — |  |  | (1,600) |  |  | 36,689 |  |  | 0.83 |
Over 10 years | 906,489 |  |  | 647 |  |  | (6,908) |  |  | 900,228 |  |  | 1.14 |
Corporate debt securities due |  |  |  |  |  |  |  |  |
Within 1 year | 54,209 |  |  | 337 |  |  | (51) |  |  | 54,495 |  |  | 1.22 |
1 to 5 years | 128,289 |  |  | 3,366 |  |  | (428) |  |  | 131,227 |  |  | 1.78 |
5 to 10 years | 97,157 |  |  | 4,305 |  |  | — |  |  | 101,462 |  |  | 1.50 |
Municipal bonds due |  |  |  |  |  |  |  |  |
1 to 5 years | 1,461 |  |  | 36 |  |  | — |  |  | 1,497 |  |  | — |
Over 10 years | 36,044 |  |  | 774 |  |  | — |  |  | 36,818 |  |  | 5.40 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 929,713 |  |  | 39,166 |  |  | (627) |  |  | 968,252 |  |  | 2.82 |
| 2,210,099 |  |  | 49,007 |  |  | (9,614) |  |  | 2,249,492 |  |  | 1.97 |
Held-to-maturity securities |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 698,934 |  |  | 21,582 |  |  | — |  |  | 720,516 |  |  | 3.16 |
Commercial MBS | 6,904 |  |  | — |  |  | (52) |  |  | 6,852 |  |  | 1.02 |
| 705,838 |  |  | 21,582 |  |  | (52) |  |  | 727,368 |  |  | 3.14 |
| $ | 2,915,937 |  |  | $ | 70,589 |  |  | $ | (9,666) |  |  | $ | 2,976,860 |  |  | 2.25 | %
During fiscal year 2020, as permitted in conjunction with the adoption of ASU 2019-04, the Company reclassified $374,680,000 of prepayable debt securities from held-to-maturity to available-for-sale. The Company purchased $530,227,000 of available-for-sale investment securities and no held-to-maturity investment securities during 2021. Sales of available-for-sale securities totaled $1,499,000 and there were no sales of held-to-maturity investment securities in 2021. Substantially all mortgage-backed securities have contractual due dates that exceed 25 years. The Company elected to exclude AIR from the amortized cost basis of debt securities disclosed throughout this footnote. For AFS securities, AIR totaled $3,459,000 and $3,285,000 as of September 30, 2021 and September 30, 2020, respectively. For HTM debt securities, AIR totaled $944,000 and $1,811,000 as of September 30, 2021 and September 30, 2020, respectively. AIR is included in the “interest receivable” line item on the Company’s consolidated statements of financial condition. The following tables show the gross unrealized losses and fair value of securities as of September 30, 2021 and September 30, 2020, by length of time that individual securities in each category have been in a continuous loss position. There were 31 and 51 securities with an unrealized loss as of September 30, 2021 and September 30, 2020, 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, 2021 | Less than 12 months |  | 12 months or more |  | Total
| 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 |
September 30, 2020 | Less than 12 months |  | 12 months or more |  | Total
| Unrealized Gross Losses |  | Fair Value |  | Unrealized Gross Losses |  | Fair Value |  | Unrealized Gross Losses |  | Fair Value
| (In thousands) |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities | $ | (74) |  |  | $ | 45,875 |  |  | $ | (405) |  |  | $ | 24,596 |  |  | $ | (479) |  |  | $ | 70,471 |
Asset-backed securities | (5,481) |  |  | 587,746 |  |  | (3,027) |  |  | 204,369 |  |  | (8,508) |  |  | 792,115 |
Mortgage-backed securities | (278) |  |  | 41,897 |  |  | (349) |  |  | 56,196 |  |  | (627) |  |  | 98,093 |
| (5,833) |  |  | 675,518 |  |  | (3,781) |  |  | 285,161 |  |  | (9,614) |  |  | 960,679 |
Held-to-maturity securities |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | (52) |  |  | 6,853 |  |  | — |  |  | — |  |  | (52) |  |  | 6,853 |
| $ | (5,885) |  |  | $ | 682,371 |  |  | $ | (3,781) |  |  | $ | 285,161 |  |  | $ | (9,666) |  |  | $ | 967,532 |
Substantially all of the Company’s held-to-maturity debt securities are issued by U.S. government agencies or U.S. government-sponsored enterprises. These securities carry the explicit and/or implicit guarantee of the U.S. government and have a long history of zero credit loss. Therefore, the Company did not record an allowance for credit losses for these securities as of September 30, 2021 or September 30, 2020. The Company does not believe that the available-for-sale debt securities that were in an unrealized loss position have any credit loss impairment as of September 30, 2021 or September 30, 2020. The Company does not intend to sell the investment securities that were in an unrealized loss position and it is not more likely than not that the Company will be required to sell the investment securities before recovery of their amortized cost basis, which may be at maturity. Available-for-sale debt securities issued by U.S. government agencies or U.S. government-sponsored enterprises carry the explicit and/or implicit guarantee of the U.S. government and have a long history of zero credit loss. The issuers of the corporate debt securities and municipal bonds held are considered to be of high credit quality (rated AA or higher) and the decline in fair value is due to changes in interest rates and other market conditions. The issuers continue to make timely principal and interest payments on the bonds. The fair value is expected to recover as the bonds approach maturity.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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