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Securities Purchased Under Agreements to Resell and Investment (Gross realize gains and losses by category) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]  
Sale Price $ 139,152
Book Value 134,785
Available-for-sale Securities, Gross Realized Gains 4,366
Available-for-sale Securities, Gross Realized Losses 0
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Sale Price 115,159
Book Value 110,792
Available-for-sale Securities, Gross Realized Gains 4,366
Available-for-sale Securities, Gross Realized Losses 0
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Sale Price 23,993
Book Value 23,993
Available-for-sale Securities, Gross Realized Gains 0
Available-for-sale Securities, Gross Realized Losses $ 0