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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	Dec. 31, 2013	Dec. 31, 2012
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	157
Amortized Cost, After five but within ten years, Held to Maturity	342
Amortized Cost, After ten years, Held to Maturity	6,873
Amortized Cost, Held to Maturity	7,372
Amortized Cost, Mortgage-backed securities, Held to Maturity	9,923
Total Amortized Cost, Held to Maturity	17,295	15,902
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	6,096
Fair Value, Held to maturity	6,606
Fair Value, Mortgage-backed securities, Held to Maturity	10,569
Total Fair Value, Held to Maturity	$ 17,175	$ 16,774

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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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