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ACQUISITIONS - Estimated Fair Value of Assets Acquired and Liabilities assumed (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 12, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Consideration paid : |  |  |  |
Cash |  | $ 2,900 | $ (34,360) |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Goodwill |  | 794,892 | $ 792,715 | $ 793,708
Steuben Trust Corporation [Member] |  |  |  |
Consideration paid : |  |  |  |
Cash | $ 21,600 |  |  | 21,613
Community Bank System, Inc. common stock |  |  |  | 76,942
Total net consideration paid | 98,600 |  |  | 98,555
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Cash and cash equivalents |  |  |  | 55,973
Investment securities | 180,500 |  |  | 180,497
Loans, net of allowance for credit losses on PCD loans | 339,700 |  |  | 339,017
Premises and equipment, net |  |  |  | 7,764
Accrued interest and fees receivable |  |  |  | 2,701
Other assets |  |  |  | 17,675
Deposits | (516,300) |  |  | (516,274)
Other liabilities |  |  |  | (4,841)
Other Federal Home Loan Bank borrowings |  |  |  | (6,000)
Subordinated debt held by unconsolidated subsidiary trusts |  |  |  | 2,062
Total identifiable assets, net |  |  |  | 78,574
Goodwill | $ 20,000 |  |  | 19,981
Steuben Trust Corporation [Member] | Core deposit intangibles [Member] |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Intangibles |  |  |  | 2,928
Steuben Trust Corporation [Member] | Other intangibles [Member] |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Intangibles |  |  |  | $ 1,196
NuVantage Insurance Corporation [Member] |  |  |  |
Consideration paid : |  |  |  |
Cash |  | 2,900 |  |
Community Bank System, Inc. common stock |  | 0 |  |
Total net consideration paid |  | 2,900 |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Cash and cash equivalents |  | 0 |  |
Investment securities |  | 0 |  |
Loans, net of allowance for credit losses on PCD loans |  | 0 |  |
Premises and equipment, net |  | 199 |  |
Accrued interest and fees receivable |  | 0 |  |
Other assets |  | 0 |  |
Deposits |  | 0 |  |
Other liabilities |  | (174) |  |
Other Federal Home Loan Bank borrowings |  | 0 |  |
Subordinated debt held by unconsolidated subsidiary trusts |  | 0 |  |
Total identifiable assets, net |  | 1,462 |  |
Goodwill |  | 1,438 |  |
NuVantage Insurance Corporation [Member] | Core deposit intangibles [Member] |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Intangibles |  | 0 |  |
NuVantage Insurance Corporation [Member] | Other intangibles [Member] |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Intangibles |  | $ 1,437 |  |

X
- Definition Amount due from customers or clients for goods or services, including accrued interest and fees receivable, 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 No definition available. + Details
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