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Securities (Details 3) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Available-for-sale securities          
Impairment losses recognized in earnings on other-than-temporarily impaired securities $ 178,000 $ 294,000 $ 178,000 $ 458,000  
Non-credit-related losses other-than-temporary impairment on available-for-sale securities 3,951,000 3,838,000 3,951,000 3,838,000  
Credit related other-than-temporary impairment recognized in earnings          
Fair value of total securities available-for-sale 6,865,881,000   6,865,881,000   7,571,901,000
Non-agency CMOs
         
Available-for-sale securities          
Impairment losses recognized in earnings on other-than-temporarily impaired securities 200,000 300,000 200,000 500,000  
Credit related other-than-temporary impairment recognized in earnings          
Fair value of total securities available-for-sale 65,466,000   65,466,000   69,001,000
Other-than-temporarily impaired securities 19,300,000   19,300,000   9,200,000
Variable rate non-agency CMOs
         
Available-for-sale securities          
Impairment losses recognized in earnings on other-than-temporarily impaired securities 200,000 300,000 200,000 500,000  
Credit related other-than-temporary impairment recognized in earnings          
Fair value of total securities available-for-sale 44,300,000   44,300,000    
Fixed rate non-agency CMOs
         
Credit related other-than-temporary impairment recognized in earnings          
Fair value of total securities available-for-sale 21,200,000   21,200,000    
Total debt securities
         
Credit related other-than-temporary impairment recognized in earnings          
Balance, beginning of period 17,369,000 17,550,000 17,531,000 17,923,000  
Subsequent credit-related impairment 178,000 294,000 178,000 458,000  
Reduction for securities sold   (455,000)   (455,000)  
Reduction for net increase in expected cash flows on securities for which OTTI was previously recognized (181,000) (96,000) (343,000) (633,000)  
Balance, end of period 17,366,000 17,293,000 17,366,000 17,293,000  
Fair value of total securities available-for-sale $ 6,864,375,000   $ 6,864,375,000   $ 7,570,674,000