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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After one but within five years, Held to maturity	$ 1,189
Amortized Cost, After five but within ten years, Held to maturity	9,657
Amortized Cost, Held to maturity	10,846
Amortized Cost, Mortgage-backed securities, Held to maturity	67,338
Held to maturity, Amortized Cost	78,184	$ 84,851
Fair Value of Held-to-maturity Securities
Fair Value, After one but within five years, Held to maturity	1,069
Fair Value, After five but within ten years, Held to maturity	8,674
Fair Value, Held to maturity	9,743
Fair Value, Mortgage-backed securities, Held to maturity	55,409
Held to maturity, Fair Value	$ 65,152	$ 71,698

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