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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, 2023
Dec. 31, 2022
Available for sale, Amortized Cost    
Due in one year or less $ 224,385  
Due after one year through five years 4,266  
Due after five years through ten years 33,991  
Due after ten years 798,835  
Total available-for-sale investment securities 1,061,477  
MBS: 411,043  
Amortized Cost 1,472,520 $ 1,387,874
Available for sale, Fair Value    
Due in one year or less 224,420  
Due after one year through five years 4,193  
Due after five years through ten years 32,127  
Due after ten years 685,408  
Total available-for-sale investment securities 946,148  
MBS: 389,412  
Total 1,335,560 1,299,014
Held to maturity, Amortized Cost    
Due in one year or less 15,962  
Due after one year through five years 4,861  
Due after five years through ten years 140,605  
Due after ten years 1,024,046  
Total held-to-maturity investment securities 1,185,474  
Mortgage-backed securities 122,412  
Amortized cost 1,307,886 1,326,729
Held to maturity, Fair Value    
Due in one year or less 15,281  
Due after one year through five years 4,684  
Due after five years through ten years 125,451  
Due after ten years 799,170  
Total held-to-maturity investment securities 944,586  
Mortgage-backed securities 107,844  
Total $ 1,052,430 $ 1,149,156