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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After ten years, Held to maturity	$ 6,850
Amortized Cost, Held to maturity	6,850
Amortized Cost, Mortgage-backed securities, Held to maturity	551
Held-to-maturity, Amortized Cost	7,401	$ 7,656
Fair Value of Held-to-maturity Securities
Fair Value, After ten years, Held to maturity	7,144
Fair Value, Held to maturity	7,144
Fair Value, Mortgage-backed securities, Held to maturity	573
Held to maturity, Fair Value	$ 7,717	$ 7,889

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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