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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After five but within ten years, Held to maturity	$ 8,294
Amortized Cost, After ten years, Held to maturity	2,953
Amortized Cost, Held to maturity	11,247
Amortized Cost, Mortgage-backed securities, Held to maturity	81,524
Held-to-maturity, Amortized Cost	92,771	$ 71,213
Fair Value of Held-to-maturity Securities
Fair Value, After five but within ten years, Held to maturity	7,410
Fair Value, After ten years, Held to maturity	2,551
Fair Value, Held to maturity	9,961
Fair Value, Mortgage-backed securities, Held to maturity	68,551
Held to maturity, Fair Value	$ 78,512	$ 70,446

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