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Investment securities (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Due within 1 year Amortized Cost	$ 18,701
After 1 year but within 5 years Amortized Cost	15,058
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	33,759	34,113
Due within 1 year Fair Value	18,709
After 1 year but within 5 years Fair Value	14,925
Held-to-maturity Securities, Debt Maturities, Fair Value	$ 33,634	$ 34,149

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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 second fiscal year through the fifth fiscal year following the latest fiscal year.

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