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Investment Securities - Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost    
Due in one year or less $ 3,323  
Due after one year through five years 21,829  
Due after five years through ten years 38,404  
Due after ten years 41,872  
Total 105,428  
Mortgage-backed securities 88,357  
Total available-for-sale securities 193,785 $ 175,123
Fair Value    
Due in one year or less 3,340  
Due after one year through five years 22,071  
Due after five years through ten years 39,570  
Due after ten years 42,937  
Total 107,918  
Mortgage-backed securities 90,112  
Total available-for-sale securities $ 198,030 $ 175,093