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Investment Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Amortized Cost    
Due in one year or less $ 36,745  
Due after one year through five years 122,029  
Due after five years through ten years 174,729  
Due after ten years 410,833  
Amortized Cost 744,336 $ 770,195
Fair Value    
Due in one year or less 37,158  
Due after one year through five years 126,853  
Due after five years through ten years 179,546  
Due after ten years 417,969  
Fair Value 761,526 802,163
Amortized Cost    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 205,748  
Due after ten years 105,326  
Total 311,074 0
Fair Value    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 203,119  
Due after ten years 104,211  
Total $ 307,330 $ 0