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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2019
Banking and Thrift [Abstract] |
Regulatory Capital Amounts and Ratios for Company and Bank | The following table summarizes regulatory capital amounts and ratios for the Company and the Bank as of December 31, 2019 and 2018.
|  | Actual |  |  | For Capital Adequacy Purposes |  |  | To Be Well Capitalized under Prompt Corrective Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  |  |  | Ratio |  |  | Amount |  |  |  |  | Ratio |
|  | (Dollars in thousands) |
As of December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,391,771 |  |  |  | 16.01 | % |  | $ | 695,651 |  |  | ≥ |  |  | 8.00 | % |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,376,364 |  |  |  | 15.83 | % |  | $ | 695,471 |  |  | ≥ |  |  | 8.00 | % |  | $ | 869,339 |  |  | ≥ |  |  | 10.00 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,314,152 |  |  |  | 15.11 | % |  | $ | 521,738 |  |  | ≥ |  |  | 6.00 | % |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,298,745 |  |  |  | 14.94 | % |  | $ | 521,604 |  |  | ≥ |  |  | 6.00 | % |  | $ | 695,471 |  |  | ≥ |  |  | 8.00 | %
Common equity Tier 1 capital ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,289,152 |  |  |  | 14.83 | % |  | $ | 391,304 |  |  | ≥ |  |  | 4.50 | % |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,298,745 |  |  |  | 14.94 | % |  | $ | 391,203 |  |  | ≥ |  |  | 4.50 | % |  | $ | 565,070 |  |  | ≥ |  |  | 6.50 | %
Tier 1 Capital (to Average-Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,314,152 |  |  |  | 12.33 | % |  | $ | 426,497 |  |  | ≥ |  |  | 4.00 | % |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,298,745 |  |  |  | 12.19 | % |  | $ | 426,328 |  |  | ≥ |  |  | 4.00 | % |  | $ | 532,909 |  |  | ≥ |  |  | 5.00 | %
As of December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,263,800 |  |  |  | 14.13 | % |  | $ | 715,283 |  |  | ≥ |  |  | 8.00 | % |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,253,219 |  |  |  | 14.03 | % |  | $ | 714,601 |  |  | ≥ |  |  | 8.00 | % |  | $ | 893,251 |  |  | ≥ |  |  | 10.00 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,191,228 |  |  |  | 13.32 | % |  | $ | 536,462 |  |  | ≥ |  |  | 6.00 | % |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,180,647 |  |  |  | 13.22 | % |  | $ | 535,951 |  |  | ≥ |  |  | 6.00 | % |  | $ | 714,601 |  |  | ≥ |  |  | 8.00 | %
Common equity Tier 1 capital ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,166,228 |  |  |  | 13.04 | % |  | $ | 402,347 |  |  | ≥ |  |  | 4.50 | % |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,180,647 |  |  |  | 13.22 | % |  | $ | 401,963 |  |  | ≥ |  |  | 4.50 | % |  | $ | 580,613 |  |  | ≥ |  |  | 6.50 | %
Tier 1 Capital (to Average-Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,191,228 |  |  |  | 10.98 | % |  | $ | 433,834 |  |  | ≥ |  |  | 4.00 | % |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,180,647 |  |  |  | 10.90 | % |  | $ | 433,403 |  |  | ≥ |  |  | 4.00 | % |  | $ | 541,754 |  |  | ≥ |  |  | 5.00 | %

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