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Investment Securities - Investments by Contractual Maturity Date (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Amortized Cost, Available-for-sale securities |  |  |
Amortized Cost | $ 3,016,432 | $ 2,350,864 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains | 37,273 | 19,686 |
Gross unrealized loss | (4,263) | (9,602) |
Fair Value, Available-for-sale securities |  |  |
Fair Value | 3,049,442 | 2,360,948 |
Yield, Available-for-sale securities |  |  |
Yield | 1.99% | 1.70% |
Amortized Cost, Held-to-maturity securities |  |  |
Amortized Cost | 1,548,265 | 1,654,666 |
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |  |
Gross unrealized gains | 4,855 | 3,387 |
Gross unrealized losses | (53,902) | (75,204) |
Fair Value, Held-to-maturity securities |  |  |
Fair Value | 1,499,218 | 1,582,849 |
Yield, Held-to-maturity securities |  |  |
Without a single maturity date | 3.13% |  |
Yield |  | 3.14% |
Investments | 4,564,697 | 4,005,530 |
Gross unrealized gains on investments | 42,128 | 23,073 |
Gross unrealized losses on investments | (58,165) | (84,806) |
Fair value of investments | 4,548,660 | 3,943,797 |
Yield on investments | 2.38% | 2.30% |
Proceeds from available-for-sale securities | 0 | 43,198 | 2,257,913
Gain (loss) on sale of securities |  | 0 | 95,234
Term of contractual due dates of substantially all mortgage-backed securities | 25 years |  |
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer | 1,642,718 | 190,357 |
Obligations of U.S. government |  |  |
Amortized Cost, Available-for-sale securities |  |  |
1 to 5 years | 171,154 | 61,002 |
5 to 10 years | 203,317 | 129,219 |
Over 10 years | 354,828 | 344,571 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, 1 to 5 years | 2,585 | 3,393 |
Gross unrealized gains, 5 to 10 years | 300 | 0 |
Gross unrealized gains, over 10 years | 1,028 | 0 |
Gross unrealized losses, 1 to 5 years | (748) | (252) |
Gross unrealized losses, 5 to 10 years | (102) | (1,547) |
Gross unrealized losses, over 10 years | (419) | (2,411) |
Fair Value, Available-for-sale securities |  |  |
1 to 5 years | 172,991 | 64,143 |
5 to 10 years | 203,515 | 127,672 |
Over 10 years | 355,437 | 342,160 |
Yield, Available-for-sale securities |  |  |
1 to 5 years | 1.26% | 1.98% |
5 to 10 years | 1.45% | 0.86% |
Over 10 years | 1.25% | 0.93% |
Equity Securities |  |  |
Amortized Cost, Available-for-sale securities |  |  |
1 to 5 years | 100,500 | 500 |
5 to 10 years | 0 | 100,000 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, 1 to 5 years | 887 | 11 |
Gross unrealized gains, 5 to 10 years | 0 | 726 |
Gross unrealized losses, 1 to 5 years | 0 | 0 |
Gross unrealized losses, 5 to 10 years | 0 | 0 |
Fair Value, Available-for-sale securities |  |  |
1 to 5 years | 101,387 | 511 |
5 to 10 years | 0 | 100,726 |
Yield, Available-for-sale securities |  |  |
1 to 5 years | 1.90% | 2.17% |
5 to 10 years | 0.00% | 1.80% |
Corporate debt securities |  |  |
Amortized Cost, Available-for-sale securities |  |  |
Within 1 year | 15,000 | 19,500 |
1 to 5 years | 302,540 | 317,190 |
5 to 10 years | 138,201 | 113,060 |
Over 10 years | 50,000 |  |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, within 1 year | 75 | 3 |
Gross unrealized gains, 1 to 5 years | 2,372 | 1,980 |
Gross unrealized gains, 5 to 10 years | 1,789 | 1,180 |
Gross unrealized gains, over 10 years | 0 |  |
Gross unrealized losses, within 1 year | 0 | 0 |
Gross unrealized losses, 1 to 5 years | 0 | (130) |
Gross unrealized losses, 5 to 10 years | (970) | (768) |
Gross unrealized losses, over 10 years | 0 |  |
Fair Value, Available-for-sale securities |  |  |
Within 1 year | 15,075 | 19,503 |
1 to 5 years | 304,912 | 319,040 |
5 to 10 years | 139,020 | 113,472 |
Over 10 years | 50,000 |  |
Yield, Available-for-sale securities |  |  |
Within 1 year | 1.00% | 0.49% |
1 to 5 years | 0.71% | 0.75% |
5 to 10 years | 1.43% | 1.53% |
Over 10 years | 3.00% |  |
Yield, Held-to-maturity securities |  |  |
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer | 24,155 | 9,763 |
Municipal Bonds |  |  |
Amortized Cost, Available-for-sale securities |  |  |
Over 10 years | 20,402 | 20,422 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, over 10 years | 3,279 | 2,123 |
Gross unrealized losses, over 10 years | 0 | 0 |
Fair Value, Available-for-sale securities |  |  |
Over 10 years | 23,681 | 22,545 |
Yield, Available-for-sale securities |  |  |
Over 10 years | 6.45% | 6.45% |
Agency pass through mortgage-backed securities |  |  |
Amortized Cost, Available-for-sale securities |  |  |
Without single maturity date | 1,561,639 | 1,245,400 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, without single maturity date | 24,893 | 10,270 |
Gross unrealized losses, without single maturity date | (2,024) | (4,494) |
Fair Value, Available-for-sale securities |  |  |
Without single maturity date | 1,584,508 | 1,251,176 |
Yield, Available-for-sale securities |  |  |
Without single maturity date | 2.57% | 2.18% |
Amortized Cost, Held-to-maturity securities |  |  |
Without single maturity date | 1,548,265 | 1,654,666 |
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |  |
Gross unrealized gains, without single maturity date | 4,855 | 3,387 |
Gross unrealized losses, without single maturity date | (53,902) | (75,204) |
Fair Value, Held-to-maturity securities |  |  |
Without single maturity date | 1,499,218 | 1,582,849 |
Yield, Held-to-maturity securities |  |  |
Without a single maturity date | 3.13% | 3.14% |
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer | 1,509,209 | 166,503 |
Commercial Mortgage Backed Securities [Member] |  |  |
Amortized Cost, Available-for-sale securities |  |  |
Without single maturity date | 98,851 |  |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, without single maturity date | 65 |  |
Fair Value, Available-for-sale securities |  |  |
Without single maturity date | $ 98,916 |  |
Yield, Available-for-sale securities |  |  |
Without single maturity date | 1.49% |  |

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