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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Within one year, Held to Maturity
Amortized Cost, After one but within five years, Held to maturity	158
Amortized Cost, After five but within ten years, Held to maturity	343
Amortized Cost, After ten years, Held to maturity	6,870
Amortized Cost, Held to maturity	7,371
Amortized Cost, Mortgage-backed securities, Held to maturity	8,544
Total Amortized Cost, Held to maturity	15,915	17,295
Fair Value, Within one year, Held to Maturity
Fair Value, After one but within five years, Held to maturity	160
Fair Value, After five but within ten years, Held to maturity	350
Fair Value, After ten years, Held to maturity	6,504
Fair Value, Held to maturity	7,014
Fair Value, Mortgage-backed securities, Held to maturity	9,058
Held to maturity, Fair Value	$ 16,072	$ 17,175

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

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Amount of held-to-maturity debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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