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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Available for sale, Amortized Cost    
Due in one year or less $ 176,356  
Due after one year through five years 1,797  
Due after five years through ten years 25,600  
Due after ten years 453,785  
Total available-for-sale investment securities 657,538  
MBS: 775,559  
Amortized Cost 1,433,097 $ 1,332,467
Available for sale, Fair Value    
Due in one year or less 176,436  
Due after one year through five years 1,810  
Due after five years through ten years 25,193  
Due after ten years 422,014  
Total available-for-sale investment securities 625,453  
MBS: 782,984  
Total 1,408,437 1,296,294
Held to maturity, Amortized Cost    
Due in one year or less 4,118  
Due after one year through five years 11,920  
Due after five years through ten years 141,206  
Due after ten years 1,015,088  
Total held-to-maturity investment securities 1,172,332  
Mortgage-backed securities 116,071  
Amortized cost 1,288,403 1,307,053
Held to maturity, Fair Value    
Due in one year or less 4,087  
Due after one year through five years 11,695  
Due after five years through ten years 131,105  
Due after ten years 913,482  
Total held-to-maturity investment securities 1,060,369  
Mortgage-backed securities 109,154  
Total $ 1,169,523 $ 1,166,162