Investment Securities (Int Inc - Taxable/Non-Taxable Invest Sec) (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Interest Income, Securities, Operating, Taxable $ 33,427 $ 31,421
Interest Income, Securities, Operating, Tax Exempt 5,222 4,284
Interest Income, Operating $ 38,649 $ 35,705