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ACQUISITIONS, Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 04, 2016 | Dec. 04, 2015 | Jan. 02, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Consideration paid [Abstract] |  |  |  |  |  |
Cash |  |  |  | $ 575 | $ (25,505) | $ 924
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Goodwill |  |  |  | $ 465,142 | $ 463,252 | $ 375,174
EBS-RMSCO, Inc. [Member] |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |
Cash |  |  | $ 924 |  |  |
Community Bank System, Inc. common stock |  |  | 0 |  |  |
Total net consideration paid |  |  | 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 |  |  |
Deposits |  |  | 0 |  |  |
Other liabilities |  |  | 0 |  |  |
Total identifiable assets (liabilities), net |  |  | 741 |  |  |
Goodwill |  |  | 183 |  |  |
EBS-RMSCO, Inc. [Member] | Core Deposits [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  | 0 |  |  |
EBS-RMSCO, Inc. [Member] | Other Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  | $ 578 |  |  |
WJL Agencies Inc [Member] |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |
Cash | $ 575 |  |  |  |  |
Community Bank System, Inc. common stock | 0 |  |  |  |  |
Total net consideration paid | 575 |  |  |  |  |
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 | 0 |  |  |  |  |
Deposits | 0 |  |  |  |  |
Other liabilities | 0 |  |  |  |  |
Total identifiable assets (liabilities), net | 288 |  |  |  |  |
Goodwill | 287 |  |  |  |  |
WJL Agencies Inc [Member] | Core Deposits [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles | 0 |  |  |  |  |
WJL Agencies Inc [Member] | Other Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles | $ 288 |  |  |  |  |
Oneida Financial Corp [Member] |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |
Cash |  | $ 56,266 |  |  |  |
Community Bank System, Inc. common stock |  | 102,202 |  |  |  |
Total net consideration paid |  | 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 |  | 26,529 |  |  |  |
Deposits |  | (699,241) |  |  |  |
Other liabilities |  | (1,333) |  |  |  |
Total identifiable assets (liabilities), net |  | 68,787 |  |  |  |
Goodwill |  | 89,681 |  |  |  |
Oneida Financial Corp [Member] | Core Deposits [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  | 2,570 |  |  |  |
Oneida Financial Corp [Member] | Other Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  | $ 9,994 |  |  |  |

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