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INVESTMENT SECURITIES - Investment Category of Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value    
Less than 12 Months $ 46,325 $ 16,538
12 Months or More 0 0
Total 46,325 16,538
Unrealized Loss    
Less than 12 Months 1,835 34
12 Months or More 0 0
Total 1,835 34
U.S. government agency obligations    
Fair Value    
Less than 12 Months 3,483  
12 Months or More 0  
Total 3,483  
Unrealized Loss    
Less than 12 Months 17  
12 Months or More 0  
Total 17  
Obligations of states and political subdivisions    
Fair Value    
Less than 12 Months 500  
12 Months or More 0  
Total 500  
Unrealized Loss    
Less than 12 Months 9  
12 Months or More 0  
Total 9  
Mortgage-backed securities    
Fair Value    
Less than 12 Months 42,342 16,538
12 Months or More 0 0
Total 42,342 16,538
Unrealized Loss    
Less than 12 Months 1,809 34
12 Months or More 0 0
Total $ 1,809 $ 34