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SECURITIES - Summary of Available For Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Information related to available for sale securities      
Amortized Cost $ 819,540 $ 697,906  
Gross Unrealized Gain 27,380 37,045  
Gross Unrealized Losses (6,491) (106)  
Allowance for credit losses 0 0  
Fair Value 840,429 734,845 $ 734,845
U.S. Treasury securities      
Information related to available for sale securities      
Amortized Cost 900    
Gross Unrealized Gain 0    
Gross Unrealized Losses 0    
Allowance for credit losses 0    
Fair Value 900    
U.S. government sponsored agencies      
Information related to available for sale securities      
Amortized Cost 36,150 36,492  
Gross Unrealized Gain 0 56  
Gross Unrealized Losses (1,260) (61)  
Allowance for credit losses 0 0  
Fair Value 34,890 36,487  
Mortgage-backed securities residential [Member]      
Information related to available for sale securities      
Amortized Cost 344,668 270,231  
Gross Unrealized Gain 6,903 9,289  
Gross Unrealized Losses (4,239) (17)  
Allowance for credit losses 0 0  
Fair Value 347,332 279,503  
Mortgage-backed securities commercial [Member]      
Information related to available for sale securities      
Amortized Cost 35,220 35,877  
Gross Unrealized Gain 700 1,004  
Gross Unrealized Losses (2) 0  
Allowance for credit losses 0 0  
Fair Value 35,918 36,881  
State and Municipal Securities [Member]      
Information related to available for sale securities      
Amortized Cost 402,602 355,306  
Gross Unrealized Gain 19,777 26,696  
Gross Unrealized Losses (990) (28)  
Allowance for credit losses 0 0  
Fair Value $ 421,389 $ 381,974