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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Securities
Dec. 31, 2012
Amortized Cost $ 390,622,000 $ 550,143,000
Net Unrealized Gains (Losses) 2,257,000 3,926,000
Held-to-maturity Securities 392,879,000 554,069,000
Unrecognized Holding Gains 24,102,000 40,615,000
Unrecognized Holding Losses 0 (23,000)
Fair Value 416,981,000 594,661,000
Held To Maturity Securities Average Duration 2 years 2 months  
Number of held to maturity securities transferred to available-for-sale 16  
Securities reclassified from the HTM category to AFS carrying value 39,600,000  
Securities reclassified from the HTM category to AFS net unrecognized gain 1,400,000  
Foreign Government [Member]
    
Amortized Cost 5,292,000 5,292,000
Net Unrealized Gains (Losses) 131,000 212,000
Held-to-maturity Securities 5,423,000 5,504,000
Unrecognized Holding Gains 168,000 367,000
Unrecognized Holding Losses 0 0
Fair Value 5,591,000 5,871,000
Obligations of States and Political Subdivisions [Member]
    
Amortized Cost 348,109,000 491,180,000
Net Unrealized Gains (Losses) 4,013,000 6,769,000
Held-to-maturity Securities 352,122,000 497,949,000
Unrecognized Holding Gains 17,634,000 28,996,000
Unrecognized Holding Losses 0 (23,000)
Fair Value 369,756,000 526,922,000
Corporate Securities [Member]
    
Amortized Cost 28,174,000 38,285,000
Net Unrealized Gains (Losses) (346,000) (812,000)
Held-to-maturity Securities 27,828,000 37,473,000
Unrecognized Holding Gains 2,446,000 4,648,000
Unrecognized Holding Losses 0 0
Fair Value 30,274,000 42,121,000
Asset-backed Securities [Member]
    
Amortized Cost 3,413,000 6,980,000
Net Unrealized Gains (Losses) (655,000) (1,052,000)
Held-to-maturity Securities 2,758,000 5,928,000
Unrecognized Holding Gains 657,000 1,170,000
Unrecognized Holding Losses 0 0
Fair Value 3,415,000 7,098,000
Commercial Mortgage Backed Securities [Member]
    
Amortized Cost 5,634,000 8,406,000
Net Unrealized Gains (Losses) (886,000) (1,191,000)
Held-to-maturity Securities 4,748,000 7,215,000
Unrecognized Holding Gains 3,197,000 5,434,000
Unrecognized Holding Losses 0 0
Fair Value $ 7,945,000 $ 12,649,000