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Investment Securities - Summary of Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value    
Fair Value $ 311,537 $ 379,814
Total debt securities    
Amortized Cost    
Within one year 4,794  
After one year, but within five years 111,991  
After five years, but within ten years 40,598  
After ten years 202,809  
Amortized Cost 360,192  
Fair Value    
Within one year 4,793  
After one year, but within five years 103,552  
After five years, but within ten years 35,557  
After ten years 166,844  
Fair Value $ 310,746 $ 378,990