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SECURITIES - Amortized cost and Fair values of held-to-maturity securities transferred from available-for-sale securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Held-to-maturity      
Debt securities held-to-maturity $ 318,730   $ 68,395
Fair Value 321,156   72,441
U.S. government agency      
Held-to-maturity      
Debt securities held-to-maturity 12,341    
Fair Value 12,453    
Mortgage-backed: Agency residential      
Held-to-maturity      
Debt securities held-to-maturity 22,065   13,031
Fair Value 22,418   13,483
Mortgage-backed: Agency commercial      
Held-to-maturity      
Debt securities held-to-maturity 265,657   32,880
Fair Value 266,620   $ 35,084
Debt Securities Transferred      
Held-to-maturity      
Debt securities held-to-maturity 99,271 $ 135,161  
Fair Value 99,275 129,720  
Debt Securities Transferred | U.S. government agency      
Held-to-maturity      
Debt securities held-to-maturity   7,593  
Fair Value   7,323  
Debt Securities Transferred | Mortgage-backed: Agency residential      
Held-to-maturity      
Debt securities held-to-maturity   8,776  
Fair Value   8,536  
Debt Securities Transferred | Mortgage-backed: Agency commercial      
Held-to-maturity      
Debt securities held-to-maturity 99,271 118,792  
Fair Value $ 99,275 $ 113,861