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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After one but within five years, Held to maturity	$ 569
Amortized Cost, After five but within ten years, Held to maturity	9,451
Amortized Cost, After ten years, Held to maturity	1,190
Amortized Cost, Held to maturity	11,210
Amortized Cost, Mortgage-backed securities, Held to maturity	75,036
Held-to-maturity, Amortized Cost	86,246	$ 91,179
Fair Value of Held-to-maturity Securities
Fair Value, After one but within five years, Held to maturity	510
Fair Value, After five but within ten years, Held to maturity	8,420
Fair Value, After ten years, Held to maturity	976
Fair Value, Held to maturity	9,906
Fair Value, Mortgage-backed securities, Held to maturity	58,902
Held to maturity, Fair Value	$ 68,808	$ 76,563

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