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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2015
Banking and Thrift [Abstract] |
Regulatory Capital Amounts and Ratios for Company and Bank | As of December 31, 2015 and 2014, the Company had $25.0 million of trust-preferred securities, which were included in Tier 1 capital for regulatory purposes, respectively. The following table summarizes regulatory capital amounts and ratios for the Company and the Bank as of December 31, 2015 and 2014.
|  | 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, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 914,972 |  |  |  | 18.23 | % |  | $ | 401,532 |  |  | ³ |  |  |  |  | 8.00 | % |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 905,563 |  |  |  | 18.06 | % |  | $ | 401,053 |  |  | ³ |  |  |  |  | 8.00 | % |  | $ | 501,316 |  |  | ³ |  |  |  |  | 10.00 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 852,189 |  |  |  | 16.98 | % |  | $ | 301,149 |  |  | ³ |  |  |  |  | 6.00 | % |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 842,854 |  |  |  | 16.81 | % |  | $ | 300,790 |  |  | ³ |  |  |  |  | 6.00 | % |  | $ | 401,053 |  |  | ³ |  |  |  |  | 8.00 | %
Common equity Tier 1 capital ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 827,547 |  |  |  | 16.49 | % |  | $ | 225,861 |  |  | ³ |  |  |  |  | 4.50 | % |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 842,854 |  |  |  | 16.81 | % |  | $ | 225,592 |  |  | ³ |  |  |  |  | 4.50 | % |  | $ | 325,856 |  |  | ³ |  |  |  |  | 6.50 | %
Tier 1 Capital (to Average-Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 852,189 |  |  |  | 11.22 | % |  | $ | 303,794 |  |  | ³ |  |  |  |  | 4.00 | % |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 842,854 |  |  |  | 11.11 | % |  | $ | 303,527 |  |  | ³ |  |  |  |  | 4.00 | % |  | $ | 379,409 |  |  | ³ |  |  |  |  | 5.00 | %
As of December 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 853,147 |  |  |  | 18.24 | % |  | $ | 374,144 |  |  | ³ |  |  |  |  | 8.00 | % |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 845,951 |  |  |  | 18.11 | % |  | $ | 373,758 |  |  | ³ |  |  |  |  | 8.00 | % |  | $ | 467,197 |  |  | ³ |  |  |  |  | 10.00 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 794,576 |  |  |  | 16.99 | % |  | $ | 187,072 |  |  | ³ |  |  |  |  | 4.00 | % |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 787,439 |  |  |  | 16.85 | % |  | $ | 186,879 |  |  | ³ |  |  |  |  | 4.00 | % |  | $ | 280,318 |  |  | ³ |  |  |  |  | 6.00 | %
Tier 1 Capital (to Average-Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 794,576 |  |  |  | 10.86 | % |  | $ | 292,615 |  |  | ³ |  |  |  |  | 4.00 | % |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 787,439 |  |  |  | 10.77 | % |  | $ | 292,392 |  |  | ³ |  |  |  |  | 4.00 | % |  | $ | 365,490 |  |  | ³ |  |  |  |  | 5.00 | %

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