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Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Amortized Cost, Available-for-sale securities |  |  |
Amortized Cost | $ 1,909,184,000 | $ 2,365,450,000 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains | 25,422,000 | 28,158,000 |
Gross unrealized loss | (11,712,000) | (13,045,000) |
Fair Value, Available-for-sale securities |  |  |
Available-for-sale securities, at fair value | $ 1,922,894,000 | $ 2,380,563,000 |
Yield, Available-for-sale securities |  |  |
Yield | 2.22% | 1.97% |
Amortized Cost, Held-to-maturity securities |  |  |
Amortized Cost | $ 1,417,599,000 | $ 1,643,216,000 |
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |  |
Gross unrealized gains | 24,171,000 | 10,516,000 |
Gross unrealized losses | (214,000) | (16,312,000) |
Fair Value, Held-to-maturity securities |  |  |
Fair Value | 1,441,556,000 | 1,637,420,000 |
Yield, Held-to-maturity securities |  |  |
Investments | 3,326,783,000 | 4,008,666,000 |
Gross unrealized gains on investments | 49,593,000 | 38,674,000 |
Gross unrealized losses on investments | (11,926,000) | (29,357,000) |
Fair value of investments | $ 3,364,450,000 | $ 4,017,983,000 |
Yield on investments | 2.62% | 2.46% |
Available-for-sale securities purchased | $ (137,591,000) | $ (315,114,000) | $ (1,280,477,000)
Payments to acquire held-to-maturity securities | 0 | 259,489,000 | 0
Proceeds from sales of available-for-sale investment securities | 50,741,000 | 246,826,000 | $ 0
Proceeds from sale of held-to-maturity securities | $ 0 |  |
Term of contractual due dates (in years) | 25 years |  |
U.S. government and agency securities |  |  |
Amortized Cost, Available-for-sale securities |  |  |
Within 1 year | $ 21,284,000 |  |
1 to 5 years | 12,477,000 | 105,065,000 |
5 to 10 years | 48,134,000 | 119,071,000 |
Over 10 years | 182,051,000 | 262,832,000 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, within 1 year | 0 |  |
Gross unrealized gains, 1 to 5 years | 1,027,000 | 1,923,000 |
Gross unrealized gains, 5 to 10 years | 0 | 35,000 |
Gross unrealized gains, over 10 years | 27,000 | 0 |
Gross unrealized losses, within 1 year | (59,000) |  |
Gross unrealized losses, 1 to 5 years | (11,000) | (274,000) |
Gross unrealized losses, 5 to 10 years | (1,589,000) | (1,247,000) |
Gross unrealized losses, over 10 years | (3,990,000) | (4,941,000) |
Fair Value, Available-for-sale securities |  |  |
Within 1 year | 21,225,000 |  |
1 to 5 years | 13,493,000 | 106,714,000 |
5 to 10 years | 46,545,000 | 117,859,000 |
Over 10 years | $ 178,088,000 | $ 257,891,000 |
Yield, Available-for-sale securities |  |  |
Within 1 year | 0.81% |  |
1 to 5 years | 7.94% | 1.74% |
5 to 10 years | 1.14% | 1.54% |
Over 10 years | 1.33% | 1.23% |
Equity Securities |  |  |
Amortized Cost, Available-for-sale securities |  |  |
Within 1 year | $ 0 | $ 500,000 |
1 to 5 years | 100,422,000 | 99,922,000 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, within 1 year | 0 | 17,000 |
Gross unrealized gains, 1 to 5 years | 1,402,000 | 1,513,000 |
Gross unrealized losses, within 1 year | 0 | 0 |
Gross unrealized losses, 1 to 5 years | 0 | 0 |
Fair Value, Available-for-sale securities |  |  |
Within 1 year | 0 | 517,000 |
1 to 5 years | $ 101,824,000 | $ 101,435,000 |
Yield, Available-for-sale securities |  |  |
Within 1 year | 0.00% | 1.80% |
1 to 5 years | 1.90% | 1.90% |
Corporate debt securities |  |  |
Amortized Cost, Available-for-sale securities |  |  |
Within 1 year | $ 278,094,000 | $ 24,787,000 |
1 to 5 years | 63,481,000 | 311,435,000 |
5 to 10 years | 69,955,000 | 100,000,000 |
Over 10 years | 50,000,000 | 69,950,000 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, within 1 year | 325,000 | 191,000 |
Gross unrealized gains, 1 to 5 years | 928,000 | 1,190,000 |
Gross unrealized gains, 5 to 10 years | 0 | 876,000 |
Gross unrealized gains, over 10 years | 938,000 | 953,000 |
Gross unrealized losses, within 1 year | (53,000) | 0 |
Gross unrealized losses, 1 to 5 years | (113,000) | (58,000) |
Gross unrealized losses, 5 to 10 years | (2,417,000) | (3,524,000) |
Gross unrealized losses, over 10 years | 0 | 0 |
Fair Value, Available-for-sale securities |  |  |
Within 1 year | 278,366,000 | 24,978,000 |
1 to 5 years | 64,296,000 | 312,567,000 |
5 to 10 years | 67,538,000 | 97,352,000 |
Over 10 years | $ 50,938,000 | $ 70,903,000 |
Yield, Available-for-sale securities |  |  |
Within 1 year | 1.33% | 0.53% |
1 to 5 years | 2.47% | 0.88% |
5 to 10 years | 1.96% | 1.47% |
Over 10 years | 3.00% | 3.00% |
Municipal bonds |  |  |
Amortized Cost, Available-for-sale securities |  |  |
1 to 5 years | $ 2,315,000 | $ 2,285,000 |
5 to 10 years | 1,335,000 | 1,303,000 |
Over 10 years | 20,363,000 | 20,382,000 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, 1 to 5 years | 2,000 | 8,000 |
Gross unrealized gains, 5 to 10 years | 38,000 | 7,000 |
Gross unrealized gains, over 10 years | 3,617,000 | 3,138,000 |
Gross unrealized losses, 1 to 5 years | 0 | 0 |
Gross unrealized losses, 5 to 10 years | 0 | 0 |
Gross unrealized losses, over 10 years | 0 | 0 |
Fair Value, Available-for-sale securities |  |  |
1 to 5 years | 2,317,000 | 2,293,000 |
5 to 10 years | 1,373,000 | 1,310,000 |
Over 10 years | $ 23,980,000 | $ 23,520,000 |
Yield, Available-for-sale securities |  |  |
1 to 5 years | 1.23% | 1.23% |
5 to 10 years | 2.05% | 2.05% |
Over 10 years | 6.45% | 6.45% |
Agency pass through mortgage-backed securities |  |  |
Amortized Cost, Available-for-sale securities |  |  |
Without single maturity date | $ 978,955,000 | $ 1,144,787,000 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, without single maturity date | 17,118,000 | 18,222,000 |
Gross unrealized losses, without single maturity date | (3,032,000) | (2,491,000) |
Fair Value, Available-for-sale securities |  |  |
Without single maturity date | $ 993,041,000 | $ 1,160,518,000 |
Yield, Available-for-sale securities |  |  |
Without single maturity date | 2.58% | 2.48% |
Amortized Cost, Held-to-maturity securities |  |  |
Without single maturity date | $ 1,417,599,000 | $ 1,643,216,000 |
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |  |
Gross unrealized gains, without single maturity date | 24,171,000 | 10,516,000 |
Gross unrealized losses, without single maturity date | (214,000) | (16,312,000) |
Fair Value, Held-to-maturity securities |  |  |
Without single maturity date | $ 1,441,556,000 | $ 1,637,420,000 |
Yield, Held-to-maturity securities |  |  |
Without a single maturity date | 3.18% | 3.19% |
Commercial MBS |  |  |
Amortized Cost, Available-for-sale securities |  |  |
Without single maturity date | $ 80,318,000 | $ 103,131,000 |
Gross Unrealized Gains / Losses, Available-for-sale securities |  |  |
Gross unrealized gains, without single maturity date | 0 | 85,000 |
Gross unrealized losses, without single maturity date | (448,000) | (510,000) |
Fair Value, Available-for-sale securities |  |  |
Without single maturity date | $ 79,870,000 | $ 102,706,000 |
Yield, Available-for-sale securities |  |  |
Without single maturity date | 1.91% | 1.51% |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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