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Investment Securities (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
security
Sep. 30, 2015
USD ($)
security
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
security
Investment Securities [Abstract]        
Securities pledged as collateral $ 810,600 $ 810,600    
Securities transferred from available for sale to held to maturity (at fair value)   $ 165,238 $ 12,802  
Unrealized holding losses included in accumulated other comprehensive income and in the carrying value of the held to maturity securities $ 1,100      
Number of security positions, unrealized loss position | security 82 82   122
Number of security positions, unrealized loss position for more than 12 months | security 10 10   51
Fair value, continuous unrealized loss position for more than 12 months $ 36,408 $ 36,408   $ 207,942
Securities available for sale, 12 months or longer, Unrealized Losses $ 123 $ 123   $ 5,699
Number of security positions, unrealized loss position for less than 12 months | security 72 72   71
Securities, less than 12 months, Fair Value $ 126,105 $ 126,105   $ 69,888
Securities, less than 12 months, Unrealized Losses $ 973 $ 973   $ 236