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Fair Value (Investment securities available-for-sale classified as level 3) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost of investment securities available-for-sale $ 1,249,769 $ 1,575,043
Investment securities available-for-sale, at fair value 1,273,879 1,588,425
Available for sale - Weighted Average Yield 2.96% 2.89%
Fair Value, Inputs, Level 3 [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities available-for-sale, at fair value $ 0 $ 19,680