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Investments (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income |  |  |
Total realized gains (losses) on trading portfolio | $ (11,943) | $ 2,350 | $ 27,692
Total change in unrealized gains (losses) on trading portfolio | 9,443 | (18,410) | 1,754
Net gains (losses) recognized on trading securities | (2,500) | (16,060) | 24,357
Change in Portfolio TS [Member] |  |  |
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income |  |  |
Total realized gains (losses) on trading portfolio |  |  | 21,947
Total change in unrealized gains (losses) on trading portfolio |  |  | 2,410
Debt securities [Member] |  |  |
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income |  |  |
Total realized gains (losses) on trading portfolio |  | (3,206) | 3,041
Total change in unrealized gains (losses) on trading portfolio | 195 | 8,472 | (7,850)
Equity securities [Member] |  |  |
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income |  |  |
Total realized gains (losses) on trading portfolio | (12,286) | 5,816 | 18,906
Total change in unrealized gains (losses) on trading portfolio | 9,158 | (26,762) | 10,519
Derivatives (non-hedging instruments) [Member] |  |  |
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income |  |  |
Total realized gains (losses) on trading portfolio | 343 | (260) |
Total change in unrealized gains (losses) on trading portfolio | 145 | 25 | (259)
Other investments [Member] |  |  |
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income |  |  |
Total change in unrealized gains (losses) on trading portfolio | $ (55) | $ (145) |

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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 22 -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. + Details
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- Definition The sum of the realized and unrealized net gain (loss) on trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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