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Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Amortized Cost, Available-for-sale securities |  |
Amortized cost | $ 2,090,070 | $ 2,210,099
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains | 50,829 | 49,007
Gross unrealized loss | (2,640) | (9,614)
Fair Value, Available-for-sale securities |  |
Available-for-sale securities, at fair value | $ 2,138,259 | $ 2,249,492
Yield, Available-for-sale securities |  |
Yield | 1.69% | 1.97%
Amortized Cost, Held-to-maturity securities |  |
Held-to-maturity securities, amortized cost | $ 366,025 | $ 705,838
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |
Gross unrealized gains | 13,522 | 21,582
Gross unrealized losses | 0 | (52)
Fair Value, Held-to-maturity securities |  |
Fair value | $ 379,547 | $ 727,368
Yield, Held-to-maturity securities |  |
Without single maturity date |  | 3.14%
Yield | 3.17% |
Investments | $ 2,456,095 | $ 2,915,937
Gross unrealized gains on investments | 64,351 | 70,589
Gross unrealized losses on investments | (2,640) | (9,666)
Total Financial Assets | $ 2,517,806 | $ 2,976,860
Yield on investments | 1.89% | 2.25%
U.S. government and agency securities |  |
Amortized Cost, Available-for-sale securities |  |
1 to 5 years | $ 47,339 |
5 to 10 years | 14,064 | $ 18,448
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, 1 to 5 years | 240 |
Gross unrealized gains, 5 to 10 years | 136 | 376
Gross unrealized losses, 1 to 5 years | 0 |
Gross unrealized losses, 5 to 10 years | 0 | 0
Fair Value, Available-for-sale securities |  |
1 to 5 years | 47,579 |
5 to 10 years | $ 14,200 | $ 18,824
Yield, Available-for-sale securities |  |
1 to 5 years | 0.44% |
5 to 10 years | 2.05% | 2.05%
Asset-backed securities |  |
Amortized Cost, Available-for-sale securities |  |
1 to 5 years | $ 19,730 |
5 to 10 years | 71,207 | $ 38,289
Over 10 years | 973,892 | 906,489
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, 1 to 5 years | 0 |
Gross unrealized gains, 5 to 10 years | 412 | 0
Gross unrealized gains, over 10 years | 14,069 | 647
Gross unrealized losses, 1 to 5 years | (434) |
Gross unrealized losses, 5 to 10 years | (97) | (1,600)
Gross unrealized losses, over 10 years | (98) | (6,908)
Fair Value, Available-for-sale securities |  |
1 to 5 years | 19,296 |
5 to 10 years | 71,522 | 36,689
Over 10 years | $ 987,863 | $ 900,228
Yield, Available-for-sale securities |  |
1 to 5 years | 0.52% |
5 to 10 years | 0.57% | 0.83%
Over 10 years | 0.94% | 1.14%
Corporate debt securities |  |
Amortized Cost, Available-for-sale securities |  |
Within 1 year | $ 225,928 | $ 54,209
1 to 5 years | 86,802 | 128,289
5 to 10 years | 28,804 | 97,157
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, within 1 year | 7,860 | 337
Gross unrealized gains, 1 to 5 years | 1,345 | 3,366
Gross unrealized gains, 5 to 10 years | 249 | 4,305
Gross unrealized losses, within 1 year | 0 | (51)
Gross unrealized losses, 1 to 5 years | 0 | (428)
Gross unrealized losses, 5 to 10 years | 0 | 0
Fair Value, Available-for-sale securities |  |
Within 1 year | 233,788 | 54,495
1 to 5 years | 88,147 | 131,227
5 to 10 years | $ 29,053 | $ 101,462
Yield, Available-for-sale securities |  |
Within 1 year | 1.57% | 1.22%
1 to 5 years | 4.64% | 1.78%
5 to 10 years | 1.95% | 1.50%
Municipal bonds |  |
Amortized Cost, Available-for-sale securities |  |
Within 1 year | $ 1,493 |
1 to 5 years | 5,781 | $ 1,461
Over 10 years | 29,909 | 36,044
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, within 1 year | 17 |
Gross unrealized gains, 1 to 5 years | 294 | 36
Gross unrealized gains, over 10 years | 2,490 | 774
Gross unrealized losses, within 1 year | 0 |
Gross unrealized losses, 1 to 5 years | 0 | 0
Gross unrealized losses, over 10 years | 0 | 0
Fair Value, Available-for-sale securities |  |
Within 1 year | 1,510 |
1 to 5 years | 6,075 | 1,497
Over 10 years | $ 32,399 | $ 36,818
Yield, Available-for-sale securities |  |
Within 1 year | 0.00% |
1 to 5 years | 0.22% | 0.00%
Over 10 years | 5.85% | 5.40%
Agency pass-through certificates |  |
Amortized Cost, Available-for-sale securities |  |
Without single maturity date | $ 585,121 | $ 929,713
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, without single maturity date | 23,717 | 39,166
Gross unrealized losses, without single maturity date | (2,011) | (627)
Fair Value, Available-for-sale securities |  |
Without single maturity date | $ 606,827 | $ 968,252
Yield, Available-for-sale securities |  |
Without single maturity date | 2.60% | 2.82%
Amortized Cost, Held-to-maturity securities |  |
Without single maturity date | $ 366,025 | $ 698,934
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |
Gross unrealized gains, without single maturity date | 13,522 | 21,582
Gross unrealized losses, without single maturity date | 0 | 0
Fair Value, Held-to-maturity securities |  |
Without single maturity date | $ 379,547 | $ 720,516
Yield, Held-to-maturity securities |  |
Without single maturity date | 3.17% | 3.16%
Commercial MBS |  |
Amortized Cost, Held-to-maturity securities |  |
Without single maturity date |  | $ 6,904
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |
Gross unrealized gains, without single maturity date |  | 0
Gross unrealized losses, without single maturity date |  | (52)
Fair Value, Held-to-maturity securities |  |
Without single maturity date |  | $ 6,852
Yield, Held-to-maturity securities |  |
Without single maturity date |  | 1.02%

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