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Stockholders' Equity - Regulatory Capital Requirements (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier one capital required for capital adequacy to risk weighted assets, conservation buffer | 2.50% |
The Company |  |
Common Equity Tier 1 risk-based capital ratio: |  |
Tier one common equity capital | $ 1,690,380 | $ 1,658,985
Tier one common equity capital to risk weighted assets | 17.54% | 18.81%
Tier one common equity capital required for capital adequacy to risk weighted assets | 4.50% | 4.50%
Tier 1 risk-based capital ratio: |  |
Tier one risk based capital | $ 1,690,380 | $ 1,658,985
Tier one risk based capital to risk weighted assets | 17.54% | 18.81%
Tier one risk based capital required for capital adequacy to risk weighted assets | 6.00% | 6.00%
Total risk-based capital ratio: |  |
Capital | $ 1,807,740 | $ 1,769,587
Capital to risk weighted assets | 18.76% | 20.07%
Capital required for capital adequacy to risk weighted assets | 8.00% | 8.00%
Tier 1 leverage ratio: |  |
Tier one leverage capital | $ 1,690,380 | $ 1,658,985
Tier one leverage capital to average assets | 11.60% | 11.71%
Tier one leverage capital required for capital adequacy to average assets | 4.00% | 4.00%
The Bank |  |
Common Equity Tier 1 risk-based capital ratio: |  |
Tier one common equity capital | $ 1,668,828 | $ 1,652,569
Tier one common equity capital to risk weighted assets | 17.32% | 18.73%
Tier one common equity capital required for capital adequacy to risk weighted assets | 4.50% | 4.50%
Tier one common equity capital required to be well capitalized to risk weighted assets | 6.50% | 6.50%
Tier 1 risk-based capital ratio: |  |
Tier one risk based capital | $ 1,668,828 | $ 1,652,569
Tier one risk based capital to risk weighted assets | 17.32% | 18.73%
Tier one risk based capital required for capital adequacy to risk weighted assets | 6.00% | 6.00%
Tier one risk based capital required to be well capitalized to risk weighted assets | 8.00% | 8.00%
Total risk-based capital ratio: |  |
Capital | $ 1,786,188 | $ 1,763,171
Capital to risk weighted assets | 18.54% | 19.98%
Capital required for capital adequacy to risk weighted assets | 8.00% | 8.00%
Capital required to be well capitalized to risk weighted assets | 10.00% | 10.00%
Tier 1 leverage ratio: |  |
Tier one leverage capital | $ 1,668,828 | $ 1,652,569
Tier one leverage capital to average assets | 11.45% | 11.66%
Tier one leverage capital required for capital adequacy to average assets | 4.00% | 4.00%
Tier one leverage capital required to be well capitalized to average assets | 5.00% | 5.00%

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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