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Stockholders' Equity - Regulatory Capital Requirements (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
The Company |  |
Common Equity Tier 1 risk-based capital ratio: |  |
Actual Capital | $ 1,678,475 | $ 1,701,327
Actual Ratio | 14.71% | 15.99%
Capital Adequacy Guidelines Ratio | 4.50% | 4.50%
Tier 1 risk-based capital ratio: |  |
Actual Capital | $ 1,678,475 | $ 1,701,327
Actual Ratio | 14.71% | 15.99%
Capital Adequacy Guidelines Ratio | 6.00% | 6.00%
Total risk-based capital ratio: |  |
Actual Capital | $ 1,814,981 | $ 1,828,935
Actual Ratio | 15.91% | 17.22%
Capital Adequacy Guidelines Ratio | 8.00% | 8.00%
Tier 1 leverage ratio: |  |
Actual Capital | $ 1,678,475 | $ 1,701,327
Actual Ratio | 10.85% | 11.49%
Capital Adequacy Guidelines Ratio | 4.00% | 4.00%
The Bank |  |
Common Equity Tier 1 risk-based capital ratio: |  |
Actual Capital | $ 1,661,628 | $ 1,668,314
Actual Ratio | 14.55% | 15.68%
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 | $ 1,661,628 | $ 1,668,314
Actual Ratio | 14.55% | 15.68%
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 | $ 1,798,135 | $ 1,795,929
Actual Ratio | 15.75% | 16.91%
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 | $ 1,661,628 | $ 1,668,314
Actual Ratio | 10.74% | 11.27%
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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