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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, 2024
Dec. 31, 2023
Available for sale, Amortized Cost    
Due in one year or less $ 141,441  
Due after one year through five years 1,913  
Due after five years through ten years 22,220  
Due after ten years 582,667  
Total available-for-sale investment securities 748,241  
MBS: 705,802  
Amortized Cost 1,454,043 $ 1,332,467
Available for sale, Fair Value    
Due in one year or less 141,396  
Due after one year through five years 1,916  
Due after five years through ten years 21,278  
Due after ten years 536,850  
Total available-for-sale investment securities 701,440  
MBS: 703,781  
Total 1,405,221 1,296,294
Held to maturity, Amortized Cost    
Due in one year or less 15,973  
Due after one year through five years 5,281  
Due after five years through ten years 142,191  
Due after ten years 1,023,397  
Total held-to-maturity investment securities 1,186,842  
Mortgage-backed securities 120,056  
Amortized cost 1,306,898 1,307,053
Held to maturity, Fair Value    
Due in one year or less 15,772  
Due after one year through five years 5,198  
Due after five years through ten years 129,856  
Due after ten years 892,230  
Total held-to-maturity investment securities 1,043,056  
Mortgage-backed securities 109,130  
Total $ 1,152,186 $ 1,166,162