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Securities (Details 3) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Available-for-sale securities      
Impairment losses recognized in earnings on other-than-temporarily impaired securities $ 0    
Non-credit-related losses other-than-temporary impairment on available-for-sale securities 492,000 2,432,000  
Credit related other-than-temporary impairment recognized in earnings      
Fair value of total securities available-for-sale 7,738,051,000   9,205,989,000
Securities held-to-maturity:      
Credit Impairment losses recognized in earnings on other-than-temporarily impaired securities 0 0  
Total debt securities
     
Credit related other-than-temporary impairment recognized in earnings      
Balance, beginning of period 16,486,000 17,531,000  
Reduction for securities sold or redeemed (12,761,000)    
Reduction for increase in expected cash flows on securities for which OTTI was previously recognized (49,000) (162,000)  
Balance, end of period 3,676,000 17,369,000  
Fair value of total securities available-for-sale 7,735,022,000   9,204,288,000
Non-agency CMOs
     
Credit related other-than-temporary impairment recognized in earnings      
Fair value of total securities available-for-sale 50,776,000   61,513,000
Variable rate non-agency CMOs
     
Credit related other-than-temporary impairment recognized in earnings      
Fair value of total securities available-for-sale 37,400,000    
Other-than-temporarily impaired securities 9,300,000    
Fixed rate non-agency CMOs
     
Credit related other-than-temporary impairment recognized in earnings      
Fair value of total securities available-for-sale 13,400,000    
Other-than-temporarily impaired securities $ 0