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ACQUISITIONS, Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 04, 2016 | Dec. 04, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Consideration paid [Abstract] |  |  |  |  |
Total net consideration paid |  |  | $ 575 | $ 0 |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Goodwill |  |  | $ 465,142 | $ 375,174 | $ 463,252
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, 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, 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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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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