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Investment Securities (Narrative) (Details)
$ in Thousands
Jun. 30, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Investment Securities [Abstract]    
Securities pledged as collateral $ 846,900  
Number of security positions, unrealized loss position | security 243 122
Number of security positions, unrealized loss position for more than 12 months | security 32 51
Fair value, continuous unrealized loss position for more than 12 months $ 142,815 $ 207,942
Securities available for sale, 12 months or longer, Unrealized Losses $ 4,060 $ 5,699
Number of security positions, unrealized loss position for less than 12 months | security 211 71
Securities, less than 12 months, Fair Value $ 365,757 $ 69,888
Securities, less than 12 months, Unrealized Losses $ 5,596 $ 236