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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After one but within five years, Held to maturity	$ 1,188
Amortized Cost, After five but within ten years, Held to maturity	9,650
Amortized Cost, Held to maturity	10,838
Amortized Cost, Mortgage-backed securities, Held to maturity	65,851
Held to maturity, Amortized Cost	76,689	$ 78,184
Fair Value of Held-to-maturity Securities
Fair Value, After one but within five years, Held to maturity	1,078
Fair Value, After five but within ten years, Held to maturity	8,641
Fair Value, Held to maturity	9,719
Fair Value, Mortgage-backed securities, Held to maturity	55,056
Held to maturity, Fair Value	$ 64,775	$ 65,152

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