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SECURITIES - Amortized cost and Fair values of securities with maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost    
Amortized Cost $ 952,144 $ 938,360
Fair Value    
Fair Value 853,740 942,168
Amortized Cost    
Debt securities held-to-maturity 546,694 336,185
Fair Value    
Fair Value 481,692 336,027
Mortgage-backed: Agency residential    
Amortized Cost    
Amortized Cost 223,738 178,236
Fair Value    
Fair Value 204,907 179,466
Amortized Cost    
Debt securities held-to-maturity 105,330 20,555
Fair Value    
Fair Value 98,839 20,649
Mortgage-backed: Agency commercial    
Amortized Cost    
Amortized Cost 154,677 164,875
Fair Value    
Fair Value 137,376 164,061
Amortized Cost    
Debt securities held-to-maturity 310,102 287,615
Fair Value    
Fair Value 263,240 $ 286,563
Available-for-sale    
Amortized Cost    
Due in 1 year or less 12,575  
Due after 1 year through 5 years 235,438  
Due after 5 years through 10 years 250,903  
Due after 10 years 74,813  
Amortized Cost 952,144  
Fair Value    
Due in 1 year or less 12,506  
Due after 1 year through 5 years 220,181  
Due after 5 years through 10 years 216,108  
Due after 10 years 62,662  
Fair Value 853,740  
Available-for-sale | Mortgage-backed: Agency residential    
Amortized Cost    
Amortized Cost 223,738  
Fair Value    
Fair Value 204,907  
Available-for-sale | Mortgage-backed: Agency commercial    
Amortized Cost    
Amortized Cost 154,677  
Fair Value    
Fair Value 137,376  
Held-to-maturity    
Amortized Cost    
Due in 1 year or less 2,492  
Due after 1 year through 5 years 25,934  
Due after 5 years through 10 years 79,440  
Due after 10 years 23,396  
Debt securities held-to-maturity 546,694  
Fair Value    
Due in 1 year or less 2,494  
Due after 1 year through 5 years 24,801  
Due after 5 years through 10 years 71,686  
Due after 10 years 20,632  
Fair Value 481,692  
Held-to-maturity | Mortgage-backed: Agency residential    
Amortized Cost    
Debt securities held-to-maturity 105,330  
Fair Value    
Fair Value 98,839  
Held-to-maturity | Mortgage-backed: Agency commercial    
Amortized Cost    
Debt securities held-to-maturity 310,102  
Fair Value    
Fair Value $ 263,240