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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After ten years, Held to maturity | $ 6,856 |
Amortized Cost, Held to maturity | 6,856 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 1,695 |
Held-to-maturity, Amortized Cost | 8,551 | $ 9,274
Fair Value of Held-to-maturity Securities |  |
Fair Value, After ten years, Held to maturity | 6,673 |
Fair Value, Held to maturity | 6,673 |
Fair Value, Mortgage-backed securities, Held to maturity | 1,762 |
Held to maturity, Fair Value | $ 8,435 | $ 9,547

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