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ACQUISITIONS, Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 04, 2015 | Jan. 02, 2014 | Dec. 13, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Consideration paid (received) [Abstract] |  |  |  |  |  |
Total net consideration paid (received) |  |  |  | $ (25,505) | $ 924 | $ (291,980)
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Goodwill |  |  |  | $ 463,252 | $ 375,174 | $ 374,991
EBS-RMSCO, Inc. [Member] |  |  |  |  |  |
Consideration paid (received) [Abstract] |  |  |  |  |  |
Cash |  | $ 924 |  |  |  |
Community Bank System, Inc. common stock |  | 0 |  |  |  |
Total net consideration paid (received) |  | 924 |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  | 0 |  |  |  |
Investment securities |  | 0 |  |  |  |
Loans |  | 0 |  |  |  |
Premises and equipment |  | 0 |  |  |  |
Accrued interest receivable |  | 0 |  |  |  |
Other assets |  | 163 |  |  |  |
Core deposit intangibles |  | 0 |  |  |  |
Other intangibles |  | 578 |  |  |  |
Deposits |  | 0 |  |  |  |
Other liabilities |  | 0 |  |  |  |
Total identifiable assets (liabilities), net |  | 741 |  |  |  |
Goodwill |  | $ 183 |  |  |  |
Bank of America Agreement [Member] |  |  |  |  |  |
Consideration paid (received) [Abstract] |  |  |  |  |  |
Cash |  |  | $ (291,980) |  |  |
Community Bank System, Inc. common stock |  |  | 0 |  |  |
Total net consideration paid (received) |  |  | (291,980) |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  |  | 0 |  |  |
Investment securities |  |  | 0 |  |  |
Loans |  |  | 1,106 |  |  |
Premises and equipment |  |  | 2,549 |  |  |
Accrued interest receivable |  |  | 5 |  |  |
Other assets |  |  | (18) |  |  |
Core deposit intangibles |  |  | 2,537 |  |  |
Other intangibles |  |  | 9 |  |  |
Deposits |  |  | (303,456) |  |  |
Other liabilities |  |  | 0 |  |  |
Total identifiable assets (liabilities), net |  |  | (297,268) |  |  |
Goodwill |  |  | $ 5,288 |  |  |
Oneida Financial Corp [Member] |  |  |  |  |  |
Consideration paid (received) [Abstract] |  |  |  |  |  |
Cash | $ 56,266 |  |  |  |  |
Community Bank System, Inc. common stock | 102,202 |  |  |  |  |
Total net consideration paid (received) | 158,468 |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Cash and cash equivalents | 81,772 |  |  |  |  |
Investment securities | 225,729 |  |  |  |  |
Loans | 399,422 |  |  |  |  |
Premises and equipment | 22,212 |  |  |  |  |
Accrued interest receivable | 1,133 |  |  |  |  |
Other assets | 27,452 |  |  |  |  |
Core deposit intangibles | 2,570 |  |  |  |  |
Other intangibles | 9,994 |  |  |  |  |
Deposits | (699,241) |  |  |  |  |
Other liabilities | (653) |  |  |  |  |
Total identifiable assets (liabilities), net | 70,390 |  |  |  |  |
Goodwill | $ 88,078 |  |  |  |  |

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