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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
Banking and Thrift [Abstract] |
Regulatory Capital Amounts and Ratios for Company and Bank | As of December 31, 2017 and 2016, 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, 2017 and 2016.
|  | 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, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,039,060 |  |  |  | 18.01% |  |  | $ | 461,574 |  |  |  | ³ |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,029,126 |  |  |  | 17.86% |  |  | $ | 461,037 |  |  |  | ³ |  |  |  | 8.00% |  |  | $ | 576,296 |  |  | ³ |  |  |  |  | 10.00% |
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 973,169 |  |  |  | 16.87% |  |  | $ | 346,180 |  |  |  | ³ |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 963,235 |  |  |  | 16.71% |  |  | $ | 345,778 |  |  |  | ³ |  |  |  | 6.00% |  |  | $ | 461,037 |  |  | ³ |  |  |  |  | 8.00% |
Common equity Tier 1 capital ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 948,210 |  |  |  | 16.43% |  |  | $ | 259,635 |  |  |  | ³ |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 963,235 |  |  |  | 16.71% |  |  | $ | 259,333 |  |  |  | ³ |  |  |  | 4.50% |  |  | $ | 374,592 |  |  | ³ |  |  |  |  | 6.50% |
Tier 1 Capital (to Average-Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 973,169 |  |  |  | 11.88% |  |  | $ | 327,680 |  |  |  | ³ |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 963,235 |  |  |  | 11.77% |  |  | $ | 327,397 |  |  |  | ³ |  |  |  | 4.00% |  |  | $ | 409,246 |  |  | ³ |  |  |  |  | 5.00% |
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 982,461 |  |  |  | 18.19% |  |  | $ | 432,081 |  |  |  | ³ |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 971,681 |  |  |  | 18.01% |  |  | $ | 431,576 |  |  |  | ³ |  |  |  | 8.00% |  |  | $ | 539,471 |  |  | ³ |  |  |  |  | 10.00% |
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 914,937 |  |  |  | 16.94% |  |  | $ | 324,061 |  |  |  | ³ |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 904,236 |  |  |  | 16.76% |  |  | $ | 323,682 |  |  |  | ³ |  |  |  | 6.00% |  |  | $ | 431,576 |  |  | ³ |  |  |  |  | 8.00% |
Common equity Tier 1 capital ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 890,118 |  |  |  | 16.48% |  |  | $ | 243,046 |  |  |  | ³ |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 904,236 |  |  |  | 16.76% |  |  | $ | 242,762 |  |  |  | ³ |  |  |  | 4.50% |  |  | $ | 350,656 |  |  | ³ |  |  |  |  | 6.50% |
Tier 1 Capital (to Average-Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 914,937 |  |  |  | 11.49% |  |  | $ | 318,552 |  |  |  | ³ |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  | N/A |
Bank |  | $ | 904,236 |  |  |  | 11.36% |  |  | $ | 318,305 |  |  |  | ³ |  |  |  | 4.00% |  |  | $ | 397,882 |  |  | ³ |  |  |  |  | 5.00% |

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