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Regulatory Matters (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Cash dividends paid $ 45.0 $ 27.8 $ 11.5
Amount available to be paid as dividends without prior regulatory approval 136.7    
Reserve balances required to be maintained at the Federal Reserve Bank $ 160.2 $ 122.2  
Minimum ratio of qualifying total capital to risk-weighted assets 8.00%    
Tier 1 minimum ratio of qualifying total capital to risk-weighted assets 4.00%    
Tier 1 capital to total assets 10.00% 9.40%  
Ratios required for the banks to be well capitalized, Total Capital to Risk-Weighted Assets 10.00%    
Ratios required for the banks to be well capitalized, Tier1 Capital to Risk-Weighted Assets 6.00%    
Ratios required for the banks to be well capitalized, Tier 1 Leverage Ratio 5.00%    
Strong Bank Holding Companies [Member]
     
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Tier 1 capital to total assets 3.00%    
Other Banking Holding Companies [Member]
     
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Tier 1 capital to total assets 4.00%