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ACQUISITIONS, Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2017 | Feb. 03, 2017 | Jan. 04, 2017 | Jan. 04, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Consideration paid [Abstract] |  |  |  |  |  |  |
Cash |  |  |  |  | $ 63,517 | $ 575 |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Goodwill |  |  |  |  | 542,986 | $ 465,142 | $ 465,142
BAS [Member] |  |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |  |
Cash |  |  | $ 1,200 |  |  |  |
Community Bank System, Inc. common stock |  |  | 0 |  |  |  |
Total net consideration paid |  |  | 1,200 |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 0 |  |  |  |
Investment securities |  |  | 0 |  |  |  |
Premises and equipment |  |  | 0 |  |  |  |
Accrued interest receivable |  |  | 0 |  |  |  |
Other assets |  |  | 0 |  |  |  |
Other liabilities |  |  | 0 |  |  |  |
Total identifiable assets, net |  |  | 1,200 |  |  |  |
Goodwill |  |  | 0 |  |  |  |
BAS [Member] | Other Intangibles [Member] |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Intangibles |  |  | $ 1,200 |  |  |  |
NRS [Member] |  |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |  |
Cash |  | $ 70,073 |  |  |  |  |
Community Bank System, Inc. common stock |  | 78,483 |  |  |  |  |
Total net consideration paid |  | 148,556 |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents |  | 11,063 |  |  |  |  |
Investment securities |  | 20,294 |  |  |  |  |
Premises and equipment |  | 411 |  |  |  |  |
Accrued interest receivable |  | 75 |  |  |  |  |
Other assets |  | 10,819 |  |  |  |  |
Other liabilities |  | (30,500) |  |  |  |  |
Total identifiable assets, net |  | 72,362 |  |  |  |  |
Goodwill |  | 76,194 |  |  |  |  |
NRS [Member] | Customer Lists [Member] |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Intangibles |  | $ 60,200 |  |  |  |  |
Dryfoos [Member] |  |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |  |
Cash | $ 3,307 |  |  |  |  |  |
Community Bank System, Inc. common stock | 0 |  |  |  |  |  |
Total net consideration paid | 3,307 |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents | 0 |  |  |  |  |  |
Investment securities | 0 |  |  |  |  |  |
Premises and equipment | 0 |  |  |  |  |  |
Accrued interest receivable | 0 |  |  |  |  |  |
Other assets | 0 |  |  |  |  |  |
Other liabilities | 0 |  |  |  |  |  |
Total identifiable assets, net | 1,657 |  |  |  |  |  |
Goodwill | 1,650 |  |  |  |  |  |
Dryfoos [Member] | Other Intangibles [Member] |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Intangibles | $ 1,657 |  |  |  |  |  |
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 |  |  |
Premises and equipment |  |  |  | 0 |  |  |
Accrued interest receivable |  |  |  | 0 |  |  |
Other assets |  |  |  | 0 |  |  |
Other liabilities |  |  |  | 0 |  |  |
Total identifiable assets, net |  |  |  | 288 |  |  |
Goodwill |  |  |  | 287 |  |  |
WJL Agencies Inc [Member] | Other Intangibles [Member] |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Intangibles |  |  |  | $ 288 |  |  |
Total [Member] |  |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |  |
Cash |  |  |  |  | 74,580 |  |
Community Bank System, Inc. common stock |  |  |  |  | 78,483 |  |
Total net consideration paid |  |  |  |  | 153,063 |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 11,063 |  |
Investment securities |  |  |  |  | 20,294 |  |
Premises and equipment |  |  |  |  | 411 |  |
Accrued interest receivable |  |  |  |  | 75 |  |
Other assets |  |  |  |  | 10,819 |  |
Other liabilities |  |  |  |  | (30,500) |  |
Goodwill |  |  |  |  | 77,844 |  |
Total [Member] | Other Intangibles [Member] |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Intangibles |  |  |  |  | 63,057 |  |
Total [Member] | Customer Lists [Member] |  |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |
Total identifiable assets, net |  |  |  |  | $ 75,219 |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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