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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
Jun. 30, 2023
Dec. 31, 2022
Mar. 31, 2022
Held-to-maturity      
Debt securities held-to-maturity   $ 541,600  
Fair Value $ 469,921 478,801  
U.S. government agency      
Held-to-maturity      
Debt securities held-to-maturity   88,424  
Fair Value 78,821 78,696  
Mortgage-backed: Agency residential      
Held-to-maturity      
Debt securities held-to-maturity   102,728  
Fair Value 93,682 96,258  
Mortgage-backed: Agency commercial      
Held-to-maturity      
Debt securities held-to-maturity   308,281  
Fair Value $ 257,937 $ 261,799  
Debt Securities Transferred      
Held-to-maturity      
Debt securities held-to-maturity     $ 114,850
Fair Value     104,131
Debt Securities Transferred | U.S. government agency      
Held-to-maturity      
Debt securities held-to-maturity     78,841
Fair Value     71,048
Debt Securities Transferred | Mortgage-backed: Agency residential      
Held-to-maturity      
Debt securities held-to-maturity     8,175
Fair Value     7,651
Debt Securities Transferred | Mortgage-backed: Agency commercial      
Held-to-maturity      
Debt securities held-to-maturity     27,834
Fair Value     $ 25,432