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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After one but within five years, Held to maturity	$ 1,194
Amortized Cost, After five but within ten years, Held to maturity	9,998
Amortized Cost, Held to maturity	11,192
Amortized Cost, Mortgage-backed securities, Held to maturity	72,114
Held-to-maturity, Amortized Cost	83,306	$ 84,851
Fair Value of Held-to-maturity Securities
Fair Value, After one but within five years, Held to maturity	1,124
Fair Value, After five but within ten years, Held to maturity	9,360
Fair Value, Held to maturity	10,484
Fair Value, Mortgage-backed securities, Held to maturity	59,505
Held to maturity, Fair Value	$ 69,989	$ 71,698

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