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Premises and Equipment (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Premises and equipment        
Total $ 180,732,000 $ 180,732,000 $ 137,824,000  
Less accumulated depreciation (65,149,000) (65,149,000) (43,574,000)  
Net premises and equipment 115,583,000 115,583,000 94,250,000  
Depreciation expense charged to operations   8,700,000 7,800,000 7,000,000
Increase in OREO due to reclassification of assets held for future branch sites 347,000      
Impairment charge 306,000      
Amortization expense   1,300,000 928,000 633,000
Land
       
Premises and equipment        
Total 30,522,000 30,522,000 24,331,000  
Buildings and leasehold improvements
       
Premises and equipment        
Total 98,500,000 98,500,000 72,257,000  
Buildings and leasehold improvements | Minimum
       
Premises and equipment        
Useful Life   15 years    
Buildings and leasehold improvements | Maximum
       
Premises and equipment        
Useful Life   40 years    
Equipment and furnishings
       
Premises and equipment        
Total 50,538,000 50,538,000 40,558,000  
Equipment and furnishings | Minimum
       
Premises and equipment        
Useful Life   3 years    
Equipment and furnishings | Maximum
       
Premises and equipment        
Useful Life   10 years    
Construction in process
       
Premises and equipment        
Total 1,172,000 1,172,000 678,000  
Computer software
       
Premises and equipment        
Useful Life   36 months    
Total $ 8,900,000 $ 8,900,000 $ 6,300,000