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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
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	523
Amortized Cost, After ten years, Held to maturity	6,150
Amortized Cost, Held to maturity	6,848
Amortized Cost, Mortgage-backed securities, Held to maturity	318
Held-to-maturity, Amortized Cost	7,166	$ 7,225
Fair Value of Held-to-maturity Securities
Fair Value, Within one year, Held to Maturity	177
Fair Value, After five but within ten years, Held to maturity	546
Fair Value, After ten years, Held to maturity	6,339
Fair Value, Held to maturity	7,062
Fair Value, Mortgage-backed securities, Held to maturity	327
Held to maturity, Fair Value	$ 7,389	$ 7,513

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