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INVESTMENT SECURITIES - Additional information (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) position | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
INVESTMENT SECURITIES |  |  |  |
Gross investment gains |  | $ 118,000 | $ 15,000 | $ 115,000
Gross investment losses |  |  | 454,000 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 93,000 | (347,000) | 76,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | [1] | $ 25,000 | (92,000) | 39,000
Investment Securities: |  |  |  |
Consolidated investment securities portfolio modified, years |  | 3 years 26 days |  |
Proceeds from sales of investment securities - available for sale |  | $ 3,374,000 | 9,466,000 | 8,143,000
Book value of securities available for sale and held to maturity |  | $ 117,076,000 | 115,536,000 |
Available for sale Securities And Held To Maturity Securities In Unrealized Loss Positions | position |  | 54 |  |
Debt and Equity Securities, Gain (Loss) |  | $ 118,000 | $ (439,000) | $ 115,000
U.S. Agency |  |  |  |
Investment Securities: |  |  |  |
Available For Sale Securities Debt Maturities Weighted Average Maturity Term |  | 10 years 2 months 9 days |  |
U.S. Agency mortgage-backed securities |  |  |  |
Investment Securities: |  |  |  |
Available For Sale Securities Debt Maturities Weighted Average Maturity Term |  | 4 years 4 months 10 days |  |
Weighted Average Expected Maturity For Held To Maturity Securities |  | 4 years 7 months 13 days |  |
Corporate bonds [Member] |  |  |  |
Investment Securities: |  |  |  |
Available For Sale Securities Debt Maturities Weighted Average Maturity Term |  | 4 years 18 days |  |
Weighted Average Expected Maturity For Held To Maturity Securities |  | 3 years 2 months 16 days |  |
Municipal |  |  |  |
Investment Securities: |  |  |  |
Available For Sale Securities Debt Maturities Weighted Average Maturity Term |  | 5 years 2 months 9 days |  |
Weighted Average Expected Maturity For Held To Maturity Securities |  | 5 years 11 months 1 day |  |
Standard & Poor's, AAA Rating [Member] |  |  |  |
INVESTMENT SECURITIES |  |  |  |
Portfolio rated |  | 53.40% | 57.50% |
Securities rated below A [Member] |  |  |  |
INVESTMENT SECURITIES |  |  |  |
Portfolio rated |  | 9.10% | 10.00% |
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member] |  |  |  |
Investment Securities: |  |  |  |
Equity Securities, FV-NI |  | $ 366,000,000 |  |
Debt and Equity Securities, Gain (Loss) |  | 13,000,000 |  |
Unrealized Loss on Securities |  | $ 5,000,000 |  |
[1] | Amounts in parentheses indicate credits.

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