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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2012
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value $ 26,307 $ 182,255
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 35 8,361
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 74,910 80,051
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 15,920 25,488
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 60,482  
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 249  
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 2,402  
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 323  
U.S. Treasury [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 17,000  
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 0  
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 0  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 0  
U.S. Government Agencies [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 0 62,962
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 0 3,154
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 18,639 13,996
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 440 2,067
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 16,929  
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 137  
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 0  
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 0  
Residential Mortgage-backed Agencies [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 0 60,781
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 0 1,801
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 24,823 46,570
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 730 3,022
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 25,726  
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 32  
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 0  
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 0  
Commercial Mortgage-backed Agencies [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 9,307 21,889
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 35 1,134
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 0 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 0 0
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 8,110  
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 40  
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 0  
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 0  
Collateralized Mortgage Obligations [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value   21,201
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses   1,149
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value   3,051
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses   13
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 9,717  
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 40  
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 0  
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 0  
Obligations of States and Political Subdivisions [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 0 15,422
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 0 1,123
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 12,663 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 343 0
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 0 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 0 0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 2,402 (2,301)
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 323 (559)
Collateralized Debt Obligations [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 0 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 0 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 18,785 16,434
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses $ 14,407 $ 20,386