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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After one but within five years, Held to maturity	$ 1,192
Amortized Cost, After five but within ten years, Held to maturity	9,991
Amortized Cost, Held to maturity	11,183
Amortized Cost, Mortgage-backed securities, Held to maturity	70,415
Held-to-maturity, Amortized Cost	81,598	$ 84,851
Fair Value of Held-to-maturity Securities
Fair Value, After one but within five years, Held to maturity	1,097
Fair Value, After five but within ten years, Held to maturity	9,213
Fair Value, Held to maturity	10,310
Fair Value, Mortgage-backed securities, Held to maturity	57,914
Held to maturity, Fair Value	$ 68,224	$ 71,698

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