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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After one but within five years, Held to maturity	$ 1,186
Amortized Cost, After five but within ten years, Held to maturity	9,643
Amortized Cost, Held to maturity	10,829
Amortized Cost, Mortgage-backed securities, Held to maturity	64,308
Held to maturity, Amortized Cost	75,137	$ 78,184
Fair Value of Held-to-maturity Securities
Fair Value, After one but within five years, Held to maturity	1,096
Fair Value, After five but within ten years, Held to maturity	8,830
Fair Value, Held to maturity	9,926
Fair Value, Mortgage-backed securities, Held to maturity	54,327
Held to maturity, Fair Value	$ 64,253	$ 65,152

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