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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After five but within ten years, Held to maturity	$ 8,877
Amortized Cost, After ten years, Held to maturity	2,351
Amortized Cost, Held to maturity	11,228
Amortized Cost, Mortgage-backed securities, Held to maturity	78,477
Held-to-maturity, Amortized Cost	89,705	$ 91,179
Fair Value of Held-to-maturity Securities
Fair Value, After five but within ten years, Held to maturity	8,355
Fair Value, After ten years, Held to maturity	2,207
Fair Value, Held to maturity	10,562
Fair Value, Mortgage-backed securities, Held to maturity	66,511
Held to maturity, Fair Value	$ 77,073	$ 76,563

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