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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, 2025
Dec. 31, 2024
Available for sale, Amortized Cost    
Due in one year or less $ 134,877  
Due after one year through five years 6,715  
Due after five years through ten years 27,902  
Due after ten years 435,353  
Total available-for-sale investment securities 604,847  
MBS: 912,703  
Amortized Cost 1,517,550 $ 1,587,416
Available for sale, Fair Value    
Due in one year or less 134,874  
Due after one year through five years 6,676  
Due after five years through ten years 27,480  
Due after ten years 371,184  
Total available-for-sale investment securities 540,214  
MBS: 916,910  
Total 1,457,124 1,533,894
Held to maturity, Amortized Cost    
Due in one year or less 135  
Due after one year through five years 20,535  
Due after five years through ten years 127,653  
Due after ten years 1,014,090  
Total held-to-maturity investment securities 1,162,413  
Mortgage-backed securities 110,548  
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,272,961 1,279,234
Held to maturity, Fair Value    
Due in one year or less 135  
Due after one year through five years 20,319  
Due after five years through ten years 123,038  
Due after ten years 834,922  
Total held-to-maturity investment securities 978,414  
Mortgage-backed securities 102,963  
Total $ 1,081,377 $ 1,113,482