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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost of Held-to-maturity Securities
Amortized Cost, Within one year, Held to Maturity	$ 175
Amortized Cost, After five but within ten years, Held to maturity	324
Amortized Cost, After ten years, Held to maturity	6,350
Amortized Cost, Held to maturity	6,849
Amortized Cost, Mortgage-backed securities, Held to maturity	376
Held-to-maturity, Amortized Cost	7,225	$ 7,656
Fair Value of Held-to-maturity Securities
Fair Value, Within one year, Held to Maturity	178
Fair Value, After five but within ten years, Held to maturity	344
Fair Value, After ten years, Held to maturity	6,602
Fair Value, Held to maturity	7,124
Fair Value, Mortgage-backed securities, Held to maturity	389
Held to maturity, Fair Value	$ 7,513	$ 7,889

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