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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details 3) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, After one but within five years, Held to maturity	$ 503
Amortized Cost, After ten years, Held to maturity	6,866
Amortized Cost, Held to maturity	7,369
Amortized Cost, Mortgage-backed securities, Held to maturity	5,738
Total Amortized Cost, Held to maturity	13,107	$ 14,665
Fair Value, After one but within five years, Held to maturity	515
Fair Value, After ten years, Held to maturity	6,929
Fair Value, Held to maturity	7,444
Fair Value, Mortgage-backed securities, Held to maturity	6,138
Held to maturity, Fair Value	$ 13,582	$ 15,215

X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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