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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, 2025
Dec. 31, 2024
Available for sale, Amortized Cost    
Due in one year or less $ 50,084  
Due after one year through five years 4,991  
Due after five years through ten years 16,007  
Due after ten years 269,427  
Total available-for-sale investment securities 340,509  
MBS: 967,355  
Amortized Cost 1,307,864 $ 1,587,416
Available for sale, Fair Value    
Due in one year or less 50,098  
Due after one year through five years 5,081  
Due after five years through ten years 16,195  
Due after ten years 243,322  
Total available-for-sale investment securities 314,696  
MBS: 977,735  
Total 1,292,431 1,533,894
Held to maturity, Amortized Cost    
Due in one year or less 140  
Due after one year through five years 25,238  
Due after five years through ten years 125,603  
Due after ten years 1,004,112  
Total held-to-maturity investment securities 1,155,093  
Mortgage-backed securities 108,363  
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,263,456 1,279,234
Held to maturity, Fair Value    
Due in one year or less 139  
Due after one year through five years 25,351  
Due after five years through ten years 123,125  
Due after ten years 855,827  
Total held-to-maturity investment securities 1,004,442  
Mortgage-backed securities 101,744  
Total $ 1,106,186 $ 1,113,482