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Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Amortized Cost, Available-for-sale securities |  |
Amortized cost | $ 1,458,071 | $ 1,326,471
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains | 30,461 | 4,685
Gross unrealized loss | (2,790) | (16,199)
Fair Value, Available-for-sale securities |  |
Fair value | $ 1,485,742 | $ 1,314,957
Yield, Available-for-sale securities |  |
Yield | 3.27% | 3.30%
Amortized Cost, Held-to-maturity securities |  |
Amortized cost | $ 1,443,480 | $ 1,625,420
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |
Gross unrealized gains | 19,952 | 333
Gross unrealized losses | (337) | (76,983)
Fair Value, Held-to-maturity securities |  |
Fair value | $ 1,463,095 | 1,548,770
Yield, Held-to-maturity securities |  |
Yield | 3.15% |
Investments | $ 2,901,551 | 2,951,891
Gross unrealized gains on investments | 50,413 | 5,018
Gross unrealized losses on investments | (3,127) | (93,182)
Total Financial Assets | $ 2,948,837 | $ 2,863,727
Yield on investments | 3.21% | 3.22%
U.S. government and agency securities |  |
Amortized Cost, Available-for-sale securities |  |
5 to 10 years | $ 65,287 | $ 60,872
Over 10 years | 207,067 | 148,099
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, 5 to 10 years | 39 | 0
Gross unrealized gains, over 10 years | 1 | 109
Gross unrealized losses, 5 to 10 years | (629) | (1,473)
Gross unrealized losses, over 10 years | (987) | (314)
Fair Value, Available-for-sale securities |  |
5 to 10 years | 64,697 | 59,399
Over 10 years | $ 206,081 | $ 147,894
Yield, Available-for-sale securities |  |
5 to 10 years | 2.43% | 2.55%
Over 10 years | 3.02% | 3.05%
Equity securities |  |
Amortized Cost, Available-for-sale securities |  |
1 to 5 years |  | $ 500
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, 1 to 5 years |  | 0
Gross unrealized losses, 1 to 5 years |  | (12)
Fair Value, Available-for-sale securities |  |
1 to 5 years |  | $ 488
Yield, Available-for-sale securities |  |
1 to 5 years |  | 1.80%
Corporate debt securities |  |
Amortized Cost, Available-for-sale securities |  |
Within 1 year | $ 43,903 |
1 to 5 years | 70,000 | $ 113,762
5 to 10 years | 92,931 | 69,965
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, within 1 year | 411 |
Gross unrealized gains, 1 to 5 years | 689 | 1,875
Gross unrealized gains, 5 to 10 years | 1,879 | 35
Gross unrealized losses, within 1 year | 0 |
Gross unrealized losses, 1 to 5 years | (50) | (13)
Gross unrealized losses, 5 to 10 years | 0 | (929)
Fair Value, Available-for-sale securities |  |
Within 1 year | 44,314 |
1 to 5 years | 70,639 | 115,624
5 to 10 years | $ 94,810 | $ 69,071
Yield, Available-for-sale securities |  |
Within 1 year | 3.65% |
1 to 5 years | 3.29% | 3.59%
5 to 10 years | 3.27% | 3.23%
Municipal bonds |  |
Amortized Cost, Available-for-sale securities |  |
1 to 5 years | $ 1,430 | $ 1,398
Over 10 years | 20,303 | 20,323
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, 1 to 5 years | 14 | 0
Gross unrealized gains, over 10 years | 895 | 1,281
Gross unrealized losses, 1 to 5 years | 0 | (24)
Gross unrealized losses, over 10 years | 0 | 0
Fair Value, Available-for-sale securities |  |
1 to 5 years | 1,444 | 1,374
Over 10 years | $ 21,198 | $ 21,604
Yield, Available-for-sale securities |  |
1 to 5 years | 1.94% | 2.05%
Over 10 years | 6.45% | 6.45%
Agency pass-through certificates |  |
Amortized Cost, Available-for-sale securities |  |
Without single maturity date | $ 957,150 | $ 908,092
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, without single maturity date | 26,533 | 1,383
Gross unrealized losses, without single maturity date | (1,124) | (13,434)
Fair Value, Available-for-sale securities |  |
Without single maturity date | $ 982,559 | $ 896,041
Yield, Available-for-sale securities |  |
Without single maturity date | 3.29% | 3.29%
Amortized Cost, Held-to-maturity securities |  |
Without single maturity date | $ 1,428,480 | $ 1,610,420
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |
Gross unrealized gains, without single maturity date | 19,945 | 305
Gross unrealized losses, without single maturity date | (337) | (76,983)
Fair Value, Held-to-maturity securities |  |
Without single maturity date | $ 1,448,088 | $ 1,533,742
Yield, Held-to-maturity securities |  |
Without single maturity date | 3.15% | 3.16%
Commercial MBS |  |
Amortized Cost, Available-for-sale securities |  |
Without single maturity date |  | $ 3,460
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, without single maturity date |  | 2
Gross unrealized losses, without single maturity date |  | 0
Fair Value, Available-for-sale securities |  |
Without single maturity date |  | $ 3,462
Yield, Available-for-sale securities |  |
Without single maturity date |  | 4.36%
Amortized Cost, Held-to-maturity securities |  |
Without single maturity date | $ 15,000 | $ 15,000
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |
Gross unrealized gains, without single maturity date | 7 | 28
Gross unrealized losses, without single maturity date | 0 | 0
Fair Value, Held-to-maturity securities |  |
Without single maturity date | $ 15,007 | $ 15,028
Yield, Held-to-maturity securities |  |
Without single maturity date | 2.89% | 3.03%

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