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Fair Value Measurements - Fair Value Measurement on Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair value measurements of assets on a recurring basis    
Investment securities available for sale $ 652,477 $ 163,134
Recurring
   
Fair value measurements of assets on a recurring basis    
Total 652,477 163,134
Recurring | U.S. Treasury and U.S. Government-sponsored agencies
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 14,228 6,039
Recurring | Municipal securities
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 145,202 49,060
Recurring | U.S. Government-sponsored agencies
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 488,068 108,035
Recurring | Corporate Debt Securities [Member]
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 3,003  
Recurring | Equity Funds [Member]
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 1,976  
Recurring | Level 1
   
Fair value measurements of assets on a recurring basis    
Total 1,976 0
Recurring | Level 1 | U.S. Treasury and U.S. Government-sponsored agencies
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 0 0
Recurring | Level 1 | Municipal securities
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 0 0
Recurring | Level 1 | U.S. Government-sponsored agencies
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 0 0
Recurring | Level 1 | Corporate Debt Securities [Member]
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 0  
Recurring | Level 1 | Equity Funds [Member]
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 1,976  
Recurring | Level 2
   
Fair value measurements of assets on a recurring basis    
Total 650,501 163,134
Recurring | Level 2 | U.S. Treasury and U.S. Government-sponsored agencies
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 14,228 6,039
Recurring | Level 2 | Municipal securities
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 145,202 49,060
Recurring | Level 2 | U.S. Government-sponsored agencies
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 488,068 108,035
Recurring | Level 2 | Corporate Debt Securities [Member]
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 3,003  
Recurring | Level 2 | Equity Funds [Member]
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 0  
Recurring | Level 3
   
Fair value measurements of assets on a recurring basis    
Total 0 0
Recurring | Level 3 | U.S. Treasury and U.S. Government-sponsored agencies
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 0 0
Recurring | Level 3 | Municipal securities
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 0 0
Recurring | Level 3 | U.S. Government-sponsored agencies
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 0 0
Recurring | Level 3 | Corporate Debt Securities [Member]
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale 0  
Recurring | Level 3 | Equity Funds [Member]
   
Fair value measurements of assets on a recurring basis    
Investment securities available for sale $ 0