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Commitments and Contingent Liabilities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]    
Inherent risks associated with off balance sheet commitments $ 1.4 $ 1.4
Commitments to Extend Credit [Member]
   
Loss Contingencies [Line Items]    
Amount of commitment 1,300.0  
Standby Letters of Credit [Member]
   
Loss Contingencies [Line Items]    
Amount of commitment $ 68.4  
Maximum [Member]
   
Loss Contingencies [Line Items]    
Expiry period of standby letter of credit, maximum (in years) 2 years