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Equity (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2010 | Sep. 30, 2009
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital | $ 1,624,817 | $ 1,619,206
Capital to Risk Weighted Assets | 24.68% | 23.39%
Capital Required for Capital Adequacy | 526,765 | 553,761
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00%
Capital Required to be Well Capitalized | 658,456 | 692,201
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%
Tier One Risk Based Capital | 1,543,438 | 1,534,681
Tier One Risk Based Capital to Risk Weighted Assets | 23.44% | 22.17%
Tier One Leverage Capital Required to be Well Capitalized | 395,074 | 415,321
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 6.00% | 6.00%
Core Capital | 1,543,438 | 1,534,681
Core Capital to Adjusted Tangible Assets | 11.82% | 11.67%
Core Capital Required to be Well Capitalized | 652,672 | 657,606
Core Capital Required to be Well Capitalized to Adjusted Tangible Assets | 5.00% | 5.00%
Core Capital to Total Assets | 11.82% | 11.67%
Core Capital Required for Capital Adequacy | 391,603 | 394,563
Core Capital Required for Capital Adequacy to Total Assets | 3.00% | 3.00%
Tangible Capital | 1,543,438 | 1,534,681
Tangible Capital to Tangible Assets | 11.82% | 11.67%
Tangible Capital Required for Capital Adequacy | $ 195,802 | $ 197,282
Tangible Capital Required for Capital Adequacy to Tangible Assets | 1.50% | 1.50%

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