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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After five but within ten years, Held to maturity	$ 8,869
Amortized Cost, After ten years, Held to maturity	2,350
Amortized Cost, Held to maturity	11,219
Amortized Cost, Mortgage-backed securities, Held to maturity	76,992
Held-to-maturity, Amortized Cost	88,211	$ 91,179
Fair Value of Held-to-maturity Securities
Fair Value, After five but within ten years, Held to maturity	8,263
Fair Value, After ten years, Held to maturity	2,169
Fair Value, Held to maturity	10,432
Fair Value, Mortgage-backed securities, Held to maturity	63,581
Held to maturity, Fair Value	$ 74,013	$ 76,563

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