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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After five but within ten years, Held to maturity	$ 7,331
Amortized Cost, After ten years, Held to maturity	4,145
Amortized Cost, Held to maturity	11,476
Amortized Cost, Mortgage-backed securities, Held to maturity	59,737
Held-to-maturity, Amortized Cost	71,213	$ 7,225
Fair Value of Held-to-maturity Securities
Fair Value, After five but within ten years, Held to maturity	7,334
Fair Value, After ten years, Held to maturity	4,212
Fair Value, Held to maturity	11,546
Fair Value, Mortgage-backed securities, Held to maturity	58,900
Held to maturity, Fair Value	$ 70,446	$ 7,513

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