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Investment securities (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Due within 1 year Amortized Cost	$ 34,326us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
After 1 year but within 5 years Amortized Cost	19,854us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	54,180us-gaap_HeldToMaturitySecurities	33,759us-gaap_HeldToMaturitySecurities
Due within 1 year Fair Value	34,376us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
After 1 year but within 5 years Fair Value	18,919us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Held-to-maturity Securities, Debt Maturities, Fair Value	$ 53,295us-gaap_HeldToMaturitySecuritiesFairValue	$ 33,634us-gaap_HeldToMaturitySecuritiesFairValue

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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