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Shareholders' Equity - Regulatory Capital Requirements (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
The Company |  |
Common Equity Tier 1 risk-based capital ratio: |  |
Actual capital | $ 1,710,147 | $ 1,678,475
Actual ratio | 14.30% | 14.71%
Capital adequacy guidelines ratio | 4.50% | 4.50%
Tier 1 risk-based capital ratio: |  |
Actual capital | $ 1,710,147 | $ 1,678,475
Actual ratio | 14.30% | 14.71%
Capital adequacy guidelines ratio | 6.00% | 6.00%
Total risk-based capital ratio: |  |
Actual capital | $ 1,848,581 | $ 1,814,981
Actual ratio | 15.45% | 15.91%
Capital adequacy guidelines ratio | 8.00% | 8.00%
Tier 1 leverage ratio: |  |
Actual capital | $ 1,710,147 | $ 1,678,475
Actual ratio | 10.51% | 10.85%
Capital adequacy guidelines ratio | 4.00% | 4.00%
The Bank |  |
Common Equity Tier 1 risk-based capital ratio: |  |
Actual capital | $ 1,666,426 | $ 1,661,628
Actual ratio | 13.93% | 14.55%
Capital adequacy guidelines ratio | 4.50% | 4.50%
Categorized as well capitalized under prompt corrective action provisions ratio | 6.50% | 6.50%
Tier 1 risk-based capital ratio: |  |
Actual capital | $ 1,666,426 | $ 1,661,628
Actual ratio | 13.93% | 14.55%
Capital adequacy guidelines ratio | 6.00% | 6.00%
Categorized as well capitalized under prompt corrective action provisions ratio | 8.00% | 8.00%
Total risk-based capital ratio: |  |
Actual capital | $ 1,804,860 | $ 1,798,135
Actual ratio | 15.09% | 15.75%
Capital adequacy guidelines ratio | 8.00% | 8.00%
Categorized as well capitalized under prompt corrective action provisions ratio | 10.00% | 10.00%
Tier 1 leverage ratio: |  |
Actual capital | $ 1,666,426 | $ 1,661,628
Actual ratio | 10.24% | 10.74%
Capital adequacy guidelines ratio | 4.00% | 4.00%
Categorized as well capitalized under prompt corrective action provisions ratio | 5.00% | 5.00%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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