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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After one but within five years, Held to maturity	$ 3,212
Amortized Cost, After five but within ten years, Held to maturity	7,609
Amortized Cost, Held to maturity	10,821
Amortized Cost, Mortgage-backed securities, Held to maturity	62,465
Held to maturity, Amortized Cost	73,286	$ 78,184
Fair Value of Held-to-maturity Securities
Fair Value, After one but within five years, Held to maturity	2,939
Fair Value, After five but within ten years, Held to maturity	7,231
Fair Value, Held to maturity	10,170
Fair Value, Mortgage-backed securities, Held to maturity	53,375
Held to maturity, Fair Value	$ 63,545	$ 65,152

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