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OTHER COMPREHENSIVE INCOME (LOSS), Reclassification (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent [Abstract]                      
Available for sale security gains, net                 $ (41,000) $ 120,000 $ 0
Provision for income taxes $ (1,561,000) $ (1,759,000) $ (1,054,000) $ (889,000) $ (1,003,000) $ (1,066,000) $ (930,000) $ (821,000) (5,263,000) (3,820,000) (3,403,000)
NET INCOME $ 7,227,000 $ 8,007,000 $ 5,338,000 $ 4,531,000 $ 5,043,000 $ 5,196,000 $ 4,846,000 $ 4,405,000 25,103,000 19,490,000 18,034,000
Amount Reclassified from Accumulated Comprehensive Income (Loss) [Member]                      
AOCI Attributable to Parent [Abstract]                      
NET INCOME [1]                 56,000 (195,000) (162,000)
Unrealized Gains and Losses on Available For Sale Securities [Member] | Amount Reclassified from Accumulated Comprehensive Income (Loss) [Member]                      
AOCI Attributable to Parent [Abstract]                      
Available for sale security gains, net [1]                 305,000 24,000 (19,000)
Provision for income taxes [1]                 (65,000) (4,000) 4,000
NET INCOME [1]                 240,000 20,000 (15,000)
Defined Benefit Pension Items [Member] | Amount Reclassified from Accumulated Comprehensive Income (Loss) [Member]                      
AOCI Attributable to Parent [Abstract]                      
Other expenses [1]                 (233,000) (272,000) (186,000)
Provision for income taxes [1]                 49,000 57,000 39,000
NET INCOME [1]                 $ (184,000) $ (215,000) $ (147,000)
[1] Amounts in parentheses indicate debits to net income