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REGULATORY MATTERS (Tables) | 12 Months Ended
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Dec. 31, 2016
REGULATORY MATTERS [Abstract] |
Capital Ratios and Amounts | As of December 31, 2016, the most recent notification from the OCC categorized the Company and Bank as “well capitalized” under the regulatory framework for prompt corrective action.
|  | Actual |  |  | For capital adequacy purposes |  |  | For capital adequacy purposes plus Capital Conservation Buffer |  |  | To be well-capitalized under prompt corrective action |
(000's omitted) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Community Bank System, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage ratio |  | $ | 858,347 |  |  |  | 10.55 | % |  | $ | 325,438 |  |  |  | 4.00 | % |  |  |  |  |  |  |  | $ | 406,798 |  |  |  | 5.00 | %
Tier 1 risk-based capital |  |  | 858,347 |  |  |  | 18.10 | % |  |  | 284,583 |  |  |  | 6.00 | % |  | $ | 314,228 |  |  |  | 6.625 | % |  |  | 379,445 |  |  |  | 8.00 | %
Total risk-based capital |  |  | 905,996 |  |  |  | 19.10 | % |  |  | 379,445 |  |  |  | 8.00 | % |  |  | 409,089 |  |  |  | 8.625 | % |  |  | 474,306 |  |  |  | 10.00 | %
Common equity tier 1 capital |  |  | 759,199 |  |  |  | 16.01 | % |  |  | 213,438 |  |  |  | 4.50 | % |  |  | 243,082 |  |  |  | 5.125 | % |  |  | 308,299 |  |  |  | 6.50 | %
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage ratio |  | $ | 788,717 |  |  |  | 10.32 | % |  | $ | 305,761 |  |  |  | 4.00 | % |  |  |  |  |  |  |  |  |  | $ | 382,201 |  |  |  | 5.00 | %
Tier 1 risk-based capital |  |  | 788,717 |  |  |  | 17.09 | % |  |  | 276,886 |  |  |  | 6.00 | % |  |  |  |  |  |  |  |  |  |  | 369,181 |  |  |  | 8.00 | %
Total risk-based capital |  |  | 834,539 |  |  |  | 18.08 | % |  |  | 369,181 |  |  |  | 8.00 | % |  |  |  |  |  |  |  |  |  |  | 461,477 |  |  |  | 10.00 | %
Common equity tier 1 capital |  |  | 689,528 |  |  |  | 14.94 | % |  |  | 207,664 |  |  |  | 4.50 | % |  |  |  |  |  |  |  |  |  |  | 299,960 |  |  |  | 6.50 | %
Community Bank, N.A.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage ratio |  | $ | 672,633 |  |  |  | 8.30 | % |  | $ | 324,080 |  |  |  | 4.00 | % |  |  |  |  |  |  |  |  |  | $ | 405,099 |  |  |  | 5.00 | %
Tier 1 risk-based capital |  |  | 672,633 |  |  |  | 14.28 | % |  |  | 282,662 |  |  |  | 6.00 | % |  | $ | 312,106 |  |  |  | 6.625 | % |  |  | 376,883 |  |  |  | 8.00 | %
Total risk-based capital |  |  | 720,282 |  |  |  | 15.29 | % |  |  | 376,883 |  |  |  | 8.00 | % |  |  | 406,327 |  |  |  | 8.625 | % |  |  | 471,104 |  |  |  | 10.00 | %
Common equity tier 1 capital |  |  | 672,578 |  |  |  | 14.28 | % |  |  | 211,997 |  |  |  | 4.50 | % |  |  | 241,441 |  |  |  | 5.125 | % |  |  | 306,217 |  |  |  | 6.50 | %
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage ratio |  | $ | 673,443 |  |  |  | 8.88 | % |  | $ | 303,256 |  |  |  | 4.00 | % |  |  |  |  |  |  |  |  |  | $ | 379,070 |  |  |  | 5.00 | %
Tier 1 risk-based capital |  |  | 673,443 |  |  |  | 14.65 | % |  |  | 275,739 |  |  |  | 6.00 | % |  |  |  |  |  |  |  |  |  |  | 367,652 |  |  |  | 8.00 | %
Total risk-based capital |  |  | 719,265 |  |  |  | 15.65 | % |  |  | 367,652 |  |  |  | 8.00 | % |  |  |  |  |  |  |  |  |  |  | 459,565 |  |  |  | 10.00 | %
Common equity tier 1 capital |  |  | 673,326 |  |  |  | 14.65 | % |  |  | 206,804 |  |  |  | 4.50 | % |  |  |  |  |  |  |  |  |  |  | 298,717 |  |  |  | 6.50 | %

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