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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Available-for-sale, Amortized Cost    
Due 3 months or less $ 24,980  
Due after 3 months through one year 59,758  
Due after one year through five years 4,911  
Agency mortgage-backed securities 197,921  
Total 287,570 $ 402,537
Available-for-sale, Estimated Fair Value    
Due 3 months or less 25,061  
Due after 3 months through one year 60,708  
Due after one year through five years 5,060  
Agency mortgage-backed securities 203,609  
Total $ 294,438 $ 404,825