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SECURITIES - Summary of Available For Sale Securities (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Information related to available for sale securities    
Amortized Cost $ 1,094,338,000  
Amortized Cost   $ 697,906,000
Gross Unrealized Gain 32,759,000 37,045,000
Gross Unrealized Losses (2,862,000) (106,000)
Allowance for Credit Losses 0  
Allowance for Credit Losses   0
Fair Value 1,124,235,000  
Fair Value   734,845,000
U.S. Treasury securities    
Information related to available for sale securities    
Amortized Cost 900,000  
Gross Unrealized Gain 0  
Gross Unrealized Losses 0  
Allowance for Credit Losses 0  
Fair Value 900,000  
U.S. government sponsored agencies    
Information related to available for sale securities    
Amortized Cost 90,120,000  
Amortized Cost   36,492,000
Gross Unrealized Gain 506,000 56,000
Gross Unrealized Losses (254,000) (61,000)
Allowance for Credit Losses 0  
Allowance for Credit Losses   0
Fair Value 90,372,000  
Fair Value   36,487,000
Mortgage-backed securities: residential    
Information related to available for sale securities    
Amortized Cost 442,803,000  
Amortized Cost   270,231,000
Gross Unrealized Gain 6,558,000 9,289,000
Gross Unrealized Losses (2,383,000) (17,000)
Allowance for Credit Losses 0  
Allowance for Credit Losses   0
Fair Value 446,978,000  
Fair Value   279,503,000
Mortgage-backed securities: commercial    
Information related to available for sale securities    
Amortized Cost 29,480,000  
Amortized Cost   35,877,000
Gross Unrealized Gain 641,000 1,004,000
Gross Unrealized Losses 0 0
Allowance for Credit Losses 0  
Allowance for Credit Losses   0
Fair Value 30,121,000  
Fair Value   36,881,000
State and municipal securities    
Information related to available for sale securities    
Amortized Cost 531,035,000  
Amortized Cost   355,306,000
Gross Unrealized Gain 25,054,000 26,696,000
Gross Unrealized Losses (225,000) (28,000)
Allowance for Credit Losses 0  
Allowance for Credit Losses   0
Fair Value $ 555,864,000  
Fair Value   $ 381,974,000