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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, 2023
Dec. 31, 2022
Available for sale, Amortized Cost    
Due in one year or less $ 297,272  
Due after one year through five years 1,563  
Due after five years through ten years 33,196  
Due after ten years 918,365  
Total available-for-sale investment securities 1,250,396  
MBS: 248,739  
Amortized Cost 1,499,135 $ 1,387,874
Available for sale, Fair Value    
Due in one year or less 297,367  
Due after one year through five years 1,601  
Due after five years through ten years 32,564  
Due after ten years 865,508  
Total available-for-sale investment securities 1,197,040  
MBS: 240,182  
Total 1,437,222 1,299,014
Held to maturity, Amortized Cost    
Due in one year or less 125  
Due after one year through five years 20,795  
Due after five years through ten years 135,369  
Due after ten years 1,027,968  
Total held-to-maturity investment securities 1,184,257  
Mortgage-backed securities 124,200  
Amortized cost 1,308,457 1,326,729
Held to maturity, Fair Value    
Due in one year or less 125  
Due after one year through five years 20,037  
Due after five years through ten years 126,811  
Due after ten years 909,781  
Total held-to-maturity investment securities 1,056,754  
Mortgage-backed securities 115,820  
Total $ 1,172,574 $ 1,149,156