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Investment securities (Details 5) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Due within 1 year Amortized Cost | $ 18,960 |
After 1 year but within 5 years Amortized Cost | 15,153 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount | 34,113 |
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value | 19,014 |
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value | 15,135 |
Held-to-maturity Securities, Debt Maturities, Fair Value | $ 34,149 | $ 26,637

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
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