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INVESTMENT SECURITIES - Additional information (Details)		12 Months Ended
		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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