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REGULATORY MATTERS (Tables) | 12 Months Ended
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Dec. 31, 2017
REGULATORY MATTERS [Abstract] |
Capital Ratios and Amounts | As of December 31, 2017, 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.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage ratio |  | $ | 995,860 |  |  |  | 10.00 | % |  | $ | 398,183 |  |  |  | 4.00 | % |  |  |  |  |  |  |  | $ | 497,729 |  |  |  | 5.00 | %
Tier 1 risk-based capital |  |  | 995,860 |  |  |  | 16.64 | % |  |  | 358,988 |  |  |  | 6.00 | % |  | $ | 433,777 |  |  |  | 7.25 | % |  |  | 478,651 |  |  |  | 8.00 | %
Total risk-based capital |  |  | 1,043,910 |  |  |  | 17.45 | % |  |  | 478,651 |  |  |  | 8.00 | % |  |  | 553,440 |  |  |  | 9.25 | % |  |  | 598,314 |  |  |  | 10.00 | %
Common equity tier 1 capital |  |  | 876,685 |  |  |  | 14.65 | % |  |  | 269,241 |  |  |  | 4.50 | % |  |  | 344,030 |  |  |  | 5.75 | % |  |  | 388,904 |  |  |  | 6.50 | %
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 | %
Community Bank, N.A.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage ratio |  | $ | 859,538 |  |  |  | 8.71 | % |  | $ | 394,981 |  |  |  | 4.00 | % |  |  |  |  |  |  |  |  |  | $ | 493,726 |  |  |  | 5.00 | %
Tier 1 risk-based capital |  |  | 859,538 |  |  |  | 14.50 | % |  |  | 355,641 |  |  |  | 6.00 | % |  | $ | 429,733 |  |  |  | 7.25 | % |  |  | 474,188 |  |  |  | 8.00 | %
Total risk-based capital |  |  | 907,588 |  |  |  | 15.31 | % |  |  | 474,188 |  |  |  | 8.00 | % |  |  | 548,280 |  |  |  | 9.25 | % |  |  | 592,736 |  |  |  | 10.00 | %
Common equity tier 1 capital |  |  | 859,483 |  |  |  | 14.50 | % |  |  | 266,731 |  |  |  | 4.50 | % |  |  | 340,823 |  |  |  | 5.75 | % |  |  | 385,278 |  |  |  | 6.50 | %
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 | %

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