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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Available for sale, Amortized Cost    
Due in one year or less $ 133,820  
Due after one year through five years 6,782  
Due after five years through ten years 24,620  
Due after ten years 437,217  
Total available-for-sale investment securities 602,439  
MBS: 906,713  
Amortized Cost 1,509,152 $ 1,587,416
Available for sale, Fair Value    
Due in one year or less 133,834  
Due after one year through five years 6,662  
Due after five years through ten years 24,053  
Due after ten years 384,183  
Total available-for-sale investment securities 548,732  
MBS: 909,207  
Total 1,457,939 1,533,894
Held to maturity, Amortized Cost    
Due in one year or less 4,133  
Due after one year through five years 16,584  
Due after five years through ten years 130,331  
Due after ten years 1,014,663  
Total held-to-maturity investment securities 1,165,711  
Mortgage-backed securities 112,683  
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,278,394 1,279,234
Held to maturity, Fair Value    
Due in one year or less 4,134  
Due after one year through five years 16,527  
Due after five years through ten years 124,048  
Due after ten years 859,933  
Total held-to-maturity investment securities 1,004,642  
Mortgage-backed securities 104,466  
Total $ 1,109,108 $ 1,113,482