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Investments - Below investment grade securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities    
Available-for-sale investment securities $ 422,073 $ 443,224
Unrealized Gain (Loss) 2,701 (3,884)
Private label residential mortgage backed securities
   
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 3,957 4,344
Unrealized Gain (Loss) 1,254  
Below investment grade | Private label residential mortgage backed securities
   
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost $ 3,144