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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Available for sale, Amortized Cost    
Due in one year or less $ 174,960  
Due after one year through five years 1,915  
Due after five years through ten years 22,239  
Due after ten years 487,459  
Total available-for-sale investment securities 686,573  
MBS: 767,693  
Amortized Cost 1,454,266 $ 1,332,467
Available for sale, Fair Value    
Due in one year or less 174,962  
Due after one year through five years 1,908  
Due after five years through ten years 21,093  
Due after ten years 444,727  
Total available-for-sale investment securities 642,690  
MBS: 763,254  
Total 1,405,944 1,296,294
Held to maturity, Amortized Cost    
Due in one year or less 19,955  
Due after one year through five years 1,318  
Due after five years through ten years 142,705  
Due after ten years 1,023,559  
Total held-to-maturity investment securities 1,187,537  
Mortgage-backed securities 118,438  
Amortized cost 1,305,975 1,307,053
Held to maturity, Fair Value    
Due in one year or less 19,841  
Due after one year through five years 1,292  
Due after five years through ten years 129,083  
Due after ten years 882,865  
Total held-to-maturity investment securities 1,033,081  
Mortgage-backed securities 107,366  
Total $ 1,140,447 $ 1,166,162