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Investment Securities (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
security
Sep. 30, 2014
security
Sep. 30, 2013
Dec. 31, 2013
security
Investment Securities [Abstract]        
Securities pledged as collateral $ 785,900,000 $ 785,900,000   $ 763,100,000
Securities transferred from available for sale to held to maturity (at fair value) 12,800,000 12,802,000 227,330,000  
State and municipal debt securities transferred from available for sale to held to maturity 12,800,000 12,802,000 227,330,000  
Unrealized holding losses included in accumulated other comprehensive income and in the carrying value of the held to maturity securities   51,000    
Number of security positions, unrealized loss position 122 122   331
Number of security positions, unrealized loss position for more than 12 months 55 55    
Fair value, continuous unrealized loss position for more than 12 months 221,284,000 221,284,000   50,928,000
Securities available for sale, 12 months or longer, Unrealized Losses 7,988,000 7,988,000   2,818,000
Number of security positions, unrealized loss position for less than 12 months 67 67    
Securities, less than 12 months, Fair Value 136,413,000 136,413,000   407,299,000
Securities, less than 12 months, Unrealized Losses $ 801,000 $ 801,000   $ 15,246,000