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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Amortized Cost, After ten years, Held to maturity $ 6,865  
Amortized Cost, Held to maturity 6,865  
Amortized Cost, Mortgage-backed securities, Held to maturity 5,244  
Total Amortized Cost, Held to maturity 12,109 $ 14,665
Fair Value, After ten years, Held to maturity 7,035  
Fair Value, Held to maturity 7,035  
Fair Value, Mortgage-backed securities, Held to maturity 5,571  
Held to maturity, Fair Value $ 12,606 $ 15,215