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Capital (Tables) | 12 Months Ended
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Dec. 31, 2017
Regulatory Capital Ratios for Company in Comparison With Minimum Amounts and Ratios Required by Federal Reserve Board of Governors | The following tables present the regulatory capital ratios for the Company at December 31, 2017 and 2016, in comparison with the minimum amounts and ratios required by the FRB for capital adequacy purposes:
|  | Risk-Based Capital |  |  |  |
At December 31, 2017 |  | Common Equity Tier 1 |  |  | Tier 1 |  |  | Total |  |  | Leverage Capital |
(dollars in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Total capital |  | $ | 3,869,129 |  |  |  | 11.36 | % |  | $ | 4,371,969 |  |  |  | 12.84 | % |  | $ | 4,877,208 |  |  |  | 14.32 | % |  | $ | 4,371,969 |  |  |  | 9.58 | %
Minimum for capital adequacy purposes |  |  | 1,532,448 |  |  |  | 4.50 |  |  |  | 2,043,265 |  |  |  | 6.00 |  |  |  | 2,724,353 |  |  |  | 8.00 |  |  |  | 1,826,141 |  |  |  | 4.00 |
Excess |  | $ | 2,336,681 |  |  |  | 6.86 | % |  | $ | 2,328,704 |  |  |  | 6.84 | % |  | $ | 2,152,855 |  |  |  | 6.32 | % |  | $ | 2,545,828 |  |  |  | 5.58 | %
|  | Risk-Based Capital |  |  |  |
At December 31, 2016 |  | Common Equity Tier 1 |  |  | Tier 1 |  |  | Total |  |  | Leverage Capital |
(dollars in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Total capital |  | $ | 3,748,231 |  |  |  | 10.62 | % |  | $ | 3,748,231 |  |  |  | 10.62 | % |  | $ | 4,277,759 |  |  |  | 12.12 | % |  | $ | 3,748,231 |  |  |  | 8.00 | %
Minimum for capital adequacy purposes |  |  | 1,588,699 |  |  |  | 4.50 |  |  |  | 2,118,266 |  |  |  | 6.00 |  |  |  | 2,824,355 |  |  |  | 8.00 |  |  |  | 1,875,062 |  |  |  | 4.00 |
Excess |  | $ | 2,159,532 |  |  |  | 6.12 | % |  | $ | 1,629,965 |  |  |  | 4.62 | % |  | $ | 1,453,404 |  |  |  | 4.12 | % |  | $ | 1,873,169 |  |  |  | 4.00 | %
Actual Capital Amounts and Ratios for Community Bank in Comparison to Minimum Amounts and Ratios Required | The following tables present the actual capital amounts and ratios for the Community Bank at December 31, 2017 and 2016 in comparison to the minimum amounts and ratios required for capital adequacy purposes.
|  | Risk-Based Capital |  |  |  |
At December 31, 2017 |  | Common Equity Tier 1 |  |  | Tier 1 |  |  | Total |  |  | Leverage Capital |
(dollars in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Total capital |  | $ | 4,253,233 |  |  |  | 13.43 | % |  | $ | 4,253,233 |  |  |  | 13.43 | % |  | $ | 4,387,620 |  |  |  | 13.86 | % |  | $ | 4,253,233 |  |  |  | 10.06 | %
Minimum for capital adequacy purposes |  |  | 1,424,795 |  |  |  | 4.50 |  |  |  | 1,899,727 |  |  |  | 6.00 |  |  |  | 2,532,969 |  |  |  | 8.00 |  |  |  | 1,691,041 |  |  |  | 4.00 |
Excess |  | $ | 2,828,438 |  |  |  | 8.93 | % |  | $ | 2,353,506 |  |  |  | 7.43 | % |  | $ | 1,854,651 |  |  |  | 5.86 | % |  | $ | 2,562,192 |  |  |  | 6.06 | %
|  | Risk-Based Capital |  |  |  |
At December 31, 2016 |  | Common Equity Tier 1 |  |  | Tier 1 |  |  | Total |  |  | Leverage Capital |
(dollars in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Total capital |  | $ | 3,686,510 |  |  |  | 11.23 | % |  | $ | 3,686,510 |  |  |  | 11.23 | % |  | $ | 3,843,382 |  |  |  | 11.71 | % |  | $ | 3,686,510 |  |  |  | 8.45 | %
Minimum for capital adequacy purposes |  |  | 1,477,056 |  |  |  | 4.50 |  |  |  | 1,969,408 |  |  |  | 6.00 |  |  |  | 2,625,877 |  |  |  | 8.00 |  |  |  | 1,744,601 |  |  |  | 4.00 |
Excess |  | $ | 2,209,454 |  |  |  | 6.73 | % |  | $ | 1,717,102 |  |  |  | 5.23 | % |  | $ | 1,217,505 |  |  |  | 3.71 | % |  | $ | 1,941,909 |  |  |  | 4.45 | %
Actual Capital Amounts and Ratios for Commercial Bank in Comparison With Minimum Amounts and Ratios Required | The following tables present the actual capital amounts and ratios for the Commercial Bank at December 31, 2017 and 2016 in comparison to the minimum amounts and ratios required for capital adequacy purposes:
|  | Risk-Based Capital |  |  |  |
At December 31, 2017 |  | Common Equity Tier 1 |  |  | Tier 1 |  |  | Total |  |  | Leverage Capital |
(dollars in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Total capital |  | $ | 380,194 |  |  |  | 15.95 | % |  | $ | 380,194 |  |  |  | 15.95 | % |  | $ | 404,643 |  |  |  | 16.97 | % |  | $ | 380,194 |  |  |  | 11.37 | %
Minimum for capital adequacy purposes |  |  | 107,285 |  |  |  | 4.50 |  |  |  | 143,047 |  |  |  | 6.00 |  |  |  | 190,729 |  |  |  | 8.00 |  |  |  | 133,801 |  |  |  | 4.00 |
Excess |  | $ | 272,909 |  |  |  | 11.45 | % |  | $ | 237,147 |  |  |  | 9.95 | % |  | $ | 213,914 |  |  |  | 8.97 | % |  | $ | 246,393 |  |  |  | 7.37 | %
|  | Risk-Based Capital |  |  |  |
At December 31, 2016 |  | Common Equity Tier 1 |  |  | Tier 1 |  |  | Total |  |  | Leverage Capital |
(dollars in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Total capital |  | $ | 370,707 |  |  |  | 14.14 | % |  | $ | 370,707 |  |  |  | 14.14 | % |  | $ | 397,259 |  |  |  | 15.15 | % |  | $ | 370,707 |  |  |  | 10.53 | %
Minimum for capital adequacy purposes |  |  | 117,973 |  |  |  | 4.50 |  |  |  | 157,297 |  |  |  | 6.00 |  |  |  | 209,729 |  |  |  | 8.00 |  |  |  | 140,813 |  |  |  | 4.00 |
Excess |  | $ | 252,734 |  |  |  | 9.64 | % |  | $ | 213,410 |  |  |  | 8.14 | % |  | $ | 187,530 |  |  |  | 7.15 | % |  | $ | 229,894 |  |  |  | 6.53 | %

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