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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, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Held-to-maturity          
Debt securities held-to-maturity $ 541,600   $ 336,185    
Fair Value 478,801   336,027    
U.S. government agency          
Held-to-maturity          
Debt securities held-to-maturity 88,424   12,349    
Fair Value 78,696   12,340    
Mortgage-backed: Agency residential          
Held-to-maturity          
Debt securities held-to-maturity 102,728   20,555    
Fair Value 96,258   20,649    
Mortgage-backed: Agency commercial          
Held-to-maturity          
Debt securities held-to-maturity 308,281   287,615    
Fair Value $ 261,799   $ 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