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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
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Held-to-maturity        
Debt securities held-to-maturity $ 336,185     $ 68,395
Fair Value 336,027     72,441
U.S. government agency        
Held-to-maturity        
Debt securities held-to-maturity 12,349      
Fair Value 12,340      
Mortgage-backed: Agency residential        
Held-to-maturity        
Debt securities held-to-maturity 20,555     13,031
Fair Value 20,649     13,483
Mortgage-backed: Agency commercial        
Held-to-maturity        
Debt securities held-to-maturity 287,615     32,880
Fair Value $ 286,563     $ 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