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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Amortized Cost    
Due in one year or less $ 250,648  
Due from one year to five years 403,206  
Due from five to ten years 67,608  
Due after ten years 3,065  
Mortgage-backed securities 1,397,223  
Amortized Cost 2,121,750 $ 1,708,196
Estimated Fair Value    
Due in one year or less 251,350  
Due from one year to five years 407,836  
Due from five to ten years 67,897  
Due after ten years 2,591  
Mortgage-backed securities 1,401,997  
Estimated Fair Value 2,131,671 1,671,260
Amortized Cost    
Due in one year or less 0  
Due from one year to five years 0  
Due from five to ten years 0  
Due after ten years 33,483  
Mortgage-backed securities 169,098  
Amortized Cost 202,581 164,677
Estimated Fair Value    
Due in one year or less 0  
Due from one year to five years 0  
Due from five to ten years 0  
Due after ten years 28,351  
Mortgage-backed securities 159,261  
Estimated Fair Value $ 187,612 $ 144,028