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SECURITIES, Held-to-Maturity Securities with Unrealized Losses in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Held-to-maturity Securities with Continuous Unrealized Loss Position, Fair Value [Abstract]      
Less Than 12 Months - Fair Value     $ 2,023
12 Months or More - Fair Value     0
Fair Value     2,023
Held-to-maturity Securities with Unrealized Loss Position, Unrealized Loss [Abstract]      
Less Than 12 Months - Unrecognized Loss     (36)
12 Months or More - Unrecognized Loss     0
Unrecognized Loss     (36)
Unrealized Losses and Other-than-temporary Impairment [Abstract]      
Proceeds from sale of investment securities $ 0 $ 0  
Other than temporary impairment losses $ 0   0
Obligations of States and Political Subdivisions [Member]      
Held-to-maturity Securities with Continuous Unrealized Loss Position, Fair Value [Abstract]      
Less Than 12 Months - Fair Value     2,023
12 Months or More - Fair Value     0
Fair Value     2,023
Held-to-maturity Securities with Unrealized Loss Position, Unrealized Loss [Abstract]      
Less Than 12 Months - Unrecognized Loss     (36)
12 Months or More - Unrecognized Loss     0
Unrecognized Loss     $ (36)