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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After five but within ten years, Held to maturity	$ 324
Amortized Cost, After ten years, Held to maturity	6,526
Amortized Cost, Held to maturity	6,850
Amortized Cost, Mortgage-backed securities, Held to maturity	447
Held-to-maturity, Amortized Cost	7,297	$ 7,656
Fair Value of Held-to-maturity Securities
Fair Value, After five but within ten years, Held to maturity	346
Fair Value, After ten years, Held to maturity	6,802
Fair Value, Held to maturity	7,148
Fair Value, Mortgage-backed securities, Held to maturity	463
Held to maturity, Fair Value	$ 7,611	$ 7,889

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