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ACQUISITIONS, Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 12, 2020 | Sep. 18, 2019 | Jul. 12, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Consideration paid [Abstract] |  |  |  |  |  |
Cash |  | $ 500 | $ 95,034 | $ (34,360) | $ 4,653 | $ 1,737
Community Bank System, Inc. common stock |  |  | 0 |  |  |
Total net consideration paid |  |  | 95,034 |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  |  | 90,381 |  |  |
Investment securities |  |  | 39,770 |  |  |
Loans |  |  | 479,877 |  |  |
Premises and equipment |  |  | 13,970 |  |  |
Accrued interest and fees receivable |  |  | 1,130 |  |  |
Other assets |  |  | 14,109 |  |  |
Deposits |  |  | (568,161) |  |  |
Other liabilities |  |  | (2,922) |  |  |
Other Federal Home Loan Bank borrowings |  |  | (2,420) |  |  |
Subordinated notes payable |  |  | (13,831) |  |  |
Subordinated debt held by unconsolidated subsidiary trusts |  |  | (2,062) |  |  |
Total identifiable assets, net |  |  | 55,064 |  |  |
Goodwill |  |  | 39,970 | 793,708 | $ 773,810 | $ 733,503
Core Deposit Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  | 3,573 |  |  |
Other Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  | 1,650 |  |  |
Kinderhook Bank Corp [Member] |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |
Cash |  |  | 93,384 |  |  |
Community Bank System, Inc. common stock |  |  | 0 |  |  |
Total net consideration paid |  |  | 93,384 |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  |  | 90,381 |  |  |
Investment securities |  |  | 39,770 |  |  |
Loans |  |  | 479,877 |  |  |
Premises and equipment |  |  | 13,970 |  |  |
Accrued interest and fees receivable |  |  | 1,130 |  |  |
Other assets |  |  | 14,109 |  |  |
Deposits |  |  | (568,161) |  |  |
Other liabilities |  |  | (2,922) |  |  |
Other Federal Home Loan Bank borrowings |  |  | (2,420) |  |  |
Subordinated notes payable |  |  | (13,831) |  |  |
Subordinated debt held by unconsolidated subsidiary trusts |  |  | (2,062) |  |  |
Total identifiable assets, net |  |  | 53,414 |  |  |
Goodwill |  |  | 39,970 |  |  |
Kinderhook Bank Corp [Member] | Core Deposit Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  | 3,573 |  |  |
Kinderhook Bank Corp [Member] | Other Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  | 0 |  |  |
Other [Member] |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |
Cash |  |  | 1,650 | 1,753 |  |
Community Bank System, Inc. common stock |  |  | 0 | 0 |  |
Total net consideration paid |  |  | 1,650 | 1,753 |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  |  | 0 | 16 |  |
Investment securities |  |  | 0 | 0 |  |
Loans |  |  | 0 | 0 |  |
Premises and equipment |  |  | 0 | 10 |  |
Accrued interest and fees receivable |  |  | 0 | 0 |  |
Other assets |  |  | 0 | 105 |  |
Deposits |  |  | 0 | 0 |  |
Other liabilities |  |  | 0 | (31) |  |
Other Federal Home Loan Bank borrowings |  |  | 0 | 0 |  |
Subordinated notes payable |  |  | 0 | 0 |  |
Subordinated debt held by unconsolidated subsidiary trusts |  |  | 0 | 0 |  |
Total identifiable assets, net |  |  | 1,650 | 1,443 |  |
Goodwill |  |  | 0 | 310 |  |
Other [Member] | Core Deposit Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  | 0 | 0 |  |
Other [Member] | Other Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  | $ 1,650 | 1,343 |  |
Steuben Trust Corporation [Member] |  |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |  |
Cash | $ 98,600 |  |  | 21,613 |  |
Community Bank System, Inc. common stock |  |  |  | 76,942 |  |
Total net consideration paid |  |  |  | 98,555 |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 55,973 |  |
Investment securities | 180,500 |  |  | 180,497 |  |
Loans | 339,700 |  |  | 339,017 |  |
Premises and equipment |  |  |  | 7,764 |  |
Accrued interest and fees receivable |  |  |  | 2,701 |  |
Other assets |  |  |  | 17,675 |  |
Deposits | 516,300 |  |  | (516,274) |  |
Other liabilities |  |  |  | (5,095) |  |
Other Federal Home Loan Bank borrowings |  |  |  | (6,000) |  |
Subordinated notes payable |  |  |  | 0 |  |
Subordinated debt held by unconsolidated subsidiary trusts |  |  |  | (2,062) |  |
Total identifiable assets, net |  |  |  | 78,320 |  |
Goodwill | $ 20,200 |  |  | 20,235 |  |
Steuben Trust Corporation [Member] | Core Deposit Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  |  | 2,928 |  |
Steuben Trust Corporation [Member] | Other Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles |  |  |  | $ 1,196 |  |

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