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ACQUISITIONS, Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Sep. 18, 2019 | Jul. 12, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Consideration paid [Abstract] |  |  |  |  |  |
Cash |  | $ 500 | $ 95,034 | $ (0) | $ 1,200 |
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 | $ 773,473 | $ 733,503 | $ 773,810
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 |  |  |
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] |  | 1,650 |  |  |
Total net consideration paid | [1] |  | 1,650 |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Cash and cash equivalents | [1] |  | 0 |  |  |
Investment securities | [1] |  | 0 |  |  |
Loans | [1] |  | 0 |  |  |
Premises and equipment | [1] |  | 0 |  |  |
Accrued interest and fees receivable | [1] |  | 0 |  |  |
Other assets | [1] |  | 0 |  |  |
Deposits | [1] |  | 0 |  |  |
Other liabilities | [1] |  | 0 |  |  |
Other Federal Home Loan Bank borrowings | [1] |  | 0 |  |  |
Subordinated notes payable | [1] |  | 0 |  |  |
Subordinated debt held by unconsolidated subsidiary trusts | [1] |  | 0 |  |  |
Total identifiable assets, net | [1] |  | 1,650 |  |  |
Goodwill | [1] |  | 0 |  |  |
Other [Member] | Core Deposit Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles | [1] |  | 0 |  |  |
Other [Member] | Other Intangibles [Member] |  |  |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |
Intangibles | [1] |  | $ 1,650 |  |  |
[1] | Includes amounts related to both acquisitions completed by CISI in 2019.

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