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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
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Held-to-maturity        
Debt securities held-to-maturity $ 438,054 $ 336,185    
Fair Value 416,603 336,027    
U.S. government agency        
Held-to-maturity        
Debt securities held-to-maturity 83,407 12,349    
Fair Value 82,685 12,340    
Mortgage-backed: Agency residential        
Held-to-maturity        
Debt securities held-to-maturity 27,100 20,555    
Fair Value 26,160 20,649    
Mortgage-backed: Agency commercial        
Held-to-maturity        
Debt securities held-to-maturity 313,296 287,615    
Fair Value 293,157 $ 286,563    
Debt Securities Transferred        
Held-to-maturity        
Debt securities held-to-maturity 114,850   $ 99,271 $ 135,161
Fair Value 104,131   99,275 129,720
Debt Securities Transferred | U.S. government agency        
Held-to-maturity        
Debt securities held-to-maturity 78,841     7,593
Fair Value 71,048     7,323
Debt Securities Transferred | Mortgage-backed: Agency residential        
Held-to-maturity        
Debt securities held-to-maturity 8,175     8,776
Fair Value 7,651     8,536
Debt Securities Transferred | Mortgage-backed: Agency commercial        
Held-to-maturity        
Debt securities held-to-maturity 27,834   99,271 118,792
Fair Value $ 25,432   $ 99,275 $ 113,861