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Securities (Details 3) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Available-for-sale securities      
Impairment losses recognized in earnings on other-than-temporarily impaired securities $ 291,000 $ 651,000 $ 2,031,000
Non-credit-related losses other-than-temporary impairment on available-for-sale securities 988,000 4,198,000 7,482,000
Credit related other-than-temporary impairment recognized in earnings      
Fair value of total securities available-for-sale 9,205,989,000 7,571,901,000  
Non-agency CMOs
     
Available-for-sale securities      
Impairment losses recognized in earnings on other-than-temporarily impaired securities 291,000 651,000 1,738,000
Credit related other-than-temporary impairment recognized in earnings      
Fair value of total securities available-for-sale 61,513,000 69,001,000  
Variable rate non-agency CMOs
     
Available-for-sale securities      
Impairment losses recognized in earnings on other-than-temporarily impaired securities 300,000 700,000 1,700,000
Credit related other-than-temporary impairment recognized in earnings      
Fair value of total securities available-for-sale 45,300,000    
Other-than-temporarily impaired securities 16,200,000    
Fixed rate non-agency CMOs
     
Credit related other-than-temporary impairment recognized in earnings      
Fair value of total securities available-for-sale 16,200,000    
Perpetual preferred stock
     
Available-for-sale securities      
Impairment losses recognized in earnings on other-than-temporarily impaired securities     293,000
Total debt securities
     
Credit related other-than-temporary impairment recognized in earnings      
Balance, beginning of period 17,531,000 17,923,000  
Subsequent credit-related impairment 291,000 651,000  
Reduction for securities sold or redeemed (537,000) (455,000)  
Reduction for increase in expected cash flows on securities for which OTTI was previously recognized (799,000) (588,000)  
Balance, end of period 16,486,000 17,531,000  
Fair value of total securities available-for-sale $ 9,204,288,000 $ 7,570,674,000