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FAIR VALUE - Assets and Liabilities Measured At Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets      
Securities available for sale $ 840,429 $ 734,845 $ 734,845
Mortgage banking derivative 14,704 21,764  
Interest rate swap derivative 18,194   21,764
Liabilities      
Mortgage banking derivative 8,826 424  
Interest rate swap derivative 18,206   $ 21,794
Fair Value, Measurements, Recurring [Member]      
Assets      
U.S. Treasury securities 900    
U.S. government sponsored agency securities 34,890 36,487  
Mortgage-backed securities: residential 347,332 279,503  
Mortgage-backed securities: commercial 35,918 36,881  
State and municipal securities 421,389 381,974  
Securities available for sale 840,429 734,845  
Mortgage banking derivative 1,217 1,182  
Interest rate swap derivative 18,194 21,764  
Total assets 859,840 757,791  
Liabilities      
Mortgage banking derivative 4 111  
Interest rate swap derivative 18,206 21,794  
Total liabilities 18,210 21,905  
Level 1 | Fair Value, Measurements, Recurring [Member]      
Assets      
U.S. Treasury securities 900    
U.S. government sponsored agency securities 0 0  
Mortgage-backed securities: residential 0 0  
Mortgage-backed securities: commercial 0 0  
State and municipal securities 0 0  
Securities available for sale 900 0  
Mortgage banking derivative 0 0  
Interest rate swap derivative 0 0  
Total assets 900 0  
Liabilities      
Mortgage banking derivative 0 0  
Interest rate swap derivative 0 0  
Total liabilities 0 0  
Level 2 | Fair Value, Measurements, Recurring [Member]      
Assets      
U.S. Treasury securities 0    
U.S. government sponsored agency securities 34,890 36,487  
Mortgage-backed securities: residential 347,332 279,503  
Mortgage-backed securities: commercial 35,918 36,881  
State and municipal securities 421,249 381,834  
Securities available for sale 839,389 734,705  
Mortgage banking derivative 1,217 1,182  
Interest rate swap derivative 18,194 21,764  
Total assets 858,800 757,651  
Liabilities      
Mortgage banking derivative 4 111  
Interest rate swap derivative 18,206 21,794  
Total liabilities 18,210 21,905  
Level 3 | Fair Value, Measurements, Recurring [Member]      
Assets      
U.S. Treasury securities 0    
U.S. government sponsored agency securities 0 0  
Mortgage-backed securities: residential 0 0  
Mortgage-backed securities: commercial 0 0  
State and municipal securities 140 140  
Securities available for sale 140 140  
Mortgage banking derivative 0 0  
Interest rate swap derivative 0 0  
Total assets 140 140  
Liabilities      
Mortgage banking derivative 0 0  
Interest rate swap derivative 0 0  
Total liabilities $ 0 $ 0