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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale, Amortized Cost    
Due 3 months or less $ 24,979  
Due after 3 months through one year 19,923  
Agency mortgage-backed securities 146,894  
Total 191,796 $ 230,012
Available-for-sale, Estimated Fair Value    
Due 3 months or less 25,049  
Due after 3 months through one year 20,160  
Agency mortgage-backed securities 151,509  
Total $ 196,718 $ 235,774