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Income Taxes (Reconciliation of Federal Statutory Income Tax Rate to Effective Rate) (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
U.S. statutory tax rate 35.00% 35.00% 35.00%
State and local income taxes, net of federal income taxes 4.40% 4.80% 5.10%
Non-deductibility of losses on securities 0.00% 1.60% 0.00%
Reserve adjustments (0.10%) (0.20%) (0.90%)
Non-taxable gains on securities (1.20%) 0.00% (6.00%)
Foreign operations tax differential (2.40%) (4.00%) (4.60%)
Other (0.20%) 0.30% 0.50%
Effective income tax rate 35.50% 37.50% 29.10%