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Securities - Schedule of Held-to-Maturity Securities Amortized Cost and Estimated Fair Value (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Amortized Cost    
Due after five years through ten years $ 151,848,000  
Total held-to-maturity debt securities 151,848,000 $ 0
Fair Value    
Due after five years through ten years 154,299,000  
Total held-to-maturity debt securities $ 154,299,000 $ 0