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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Amortized Cost of Held-to-maturity Securities    
Amortized Cost, After ten years, Held to maturity $ 6,851  
Amortized Cost, Held to maturity 6,851  
Amortized Cost, Mortgage-backed securities, Held to maturity 669  
Held-to-maturity, Amortized Cost 7,520 $ 7,656
Fair Value of Held-to-maturity Securities    
Fair Value, After ten years, Held to maturity 6,989  
Fair Value, Held to maturity 6,989  
Fair Value, Mortgage-backed securities, Held to maturity 698  
Held to maturity, Fair Value $ 7,687 $ 7,889