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Investment Securities (Narrative) (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Investment Securities [Abstract]    
Securities pledged as collateral $ 908,800  
Number of security positions, unrealized loss position | security 45 152
Number of security positions, unrealized loss position for more than 12 months | security 13 10
Securities, 12 months or longer, Fair Value $ 31,294 $ 35,864
Securities, 12 months or longer, Unrealized Losses $ 113 $ 513
Number of security positions, unrealized loss position for less than 12 months | security 32 142
Securities, less than 12 months, Fair Value $ 37,246 $ 400,299
Securities, less than 12 months, Unrealized Losses $ 58 $ 5,593