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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After five but within ten years, Held to maturity	$ 8,098
Amortized Cost, After ten years, Held to maturity	3,168
Amortized Cost, Held to maturity	11,266
Amortized Cost, Mortgage-backed securities, Held to maturity	84,563
Held-to-maturity, Amortized Cost	95,829	$ 71,213
Fair Value of Held-to-maturity Securities
Fair Value, After five but within ten years, Held to maturity	7,657
Fair Value, After ten years, Held to maturity	2,986
Fair Value, Held to maturity	10,643
Fair Value, Mortgage-backed securities, Held to maturity	78,637
Held to maturity, Fair Value	$ 89,280	$ 70,446

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