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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
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 $ (1,705) $ 2,960 $ (9,154) $ 6,612
Total unrealized gains (losses) on trading portfolio (5,788) (9,640) 3,399 (7,052)
Net gains (losses) recognized on trading securities (7,493) (6,679) (5,755) (440)
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    523    (3,617)
Total unrealized gains (losses) on trading portfolio 100 2,741 137 8,260
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 (1,836) 2,682 (9,429) 10,867
Total unrealized gains (losses) on trading portfolio (5,817) (11,699) 3,172 (14,894)
Non-hedging derivative (liability) [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 131 (245) 275 (638)
Total unrealized gains (losses) on trading portfolio (30) (681) 117 (418)
Other Investments [Member]
       
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income        
Total unrealized gains (losses) on trading portfolio $ (41)   $ (27)