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SECURITIES - Amortized Cost and Estimated Fair Value of Investments in Debt Securities By Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Available for sale, Amortized Cost    
Due in one year or less $ 139,916  
Due after one year through five years 4,260  
Due after five years through ten years 22,203  
Due after ten years 591,809  
Total available-for-sale investment securities 758,188  
Mortgage-backed Securities 574,279  
Amortized cost 1,332,467 $ 1,387,874
Available for sale Securities, Fair Value    
Due in one year or less 139,935  
Due after one year through five years 4,242  
Due after five years through ten years 21,689  
Due after ten years 556,697  
Subtotal 722,563  
Mortgage-backed Securities and Other Equity Securities 573,731  
Total 1,296,294 1,299,014
Held to Maturity, Amortized Cost    
Due in one year or less 15,969  
Due after one year through five years 4,868  
Due after five years through ten years 140,774  
Due after ten years 1,024,541  
Subtotal 1,186,152  
Mortgage-backed Securities 120,901  
Amortized Cost 1,307,053 1,326,729
Held to Maturity, Fair Value    
Due in one year or less 15,092  
Due after one year through five years 4,739  
Due after five years through ten years 126,474  
Due after ten years 908,434  
Subtotal 1,054,739  
Mortgage-backed Securities 111,423  
Total $ 1,166,162 $ 1,149,156