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INVESTMENT SECURITIES (Details 2) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2013
Dec. 31, 2012
Available for Sale, Amortized Cost        
Due in one year or less     $ 70,174,000  
Due after one year through five years     136,515,000  
Due after five years through ten years     119,674,000  
Due after ten years     131,595,000  
Mortgage-backed securities     1,057,457,000  
Other     742,000  
Total     1,516,157,000  
Available for Sale, Estimated Fair Value        
Due in one year or less     70,587,000  
Due after one year through five years     138,509,000  
Due after five years through ten years     116,767,000  
Due after ten years     122,556,000  
Mortgage-backed securities     1,052,691,000  
Other     838,000  
Total     1,501,948,000 1,536,745,000
Held to Maturity, Amortized Cost        
Mortgage-backed securities     255,663,000  
Held to Maturity, Estimated Fair Value        
Mortgage-backed securities     245,519,000  
Available for sale        
Gross proceeds from sale of available for sale investment securities 127,400,000 130,076,000    
Gross realized gains on the sales of the available for sale investment securities 1,700,000      
Gross realized losses on the sales of the available for sale investment securities   900,000    
Investment securities pledged to party with no right to sell or repledge the collateral     901,300,000 905,500,000
Investment securities pledged to party with right to sell or repledge the collateral     $ 0 $ 0