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Stockholders' Equity and Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stockholders' Equity and Other Comprehensive Income [Abstract]      
Beginning balance, OTTI Related Net Unrealized (Loss) Gain $ (4,593) $ (8,009)  
Beginning balance, HTM related Net Unrealized Gain 11,144 11,937  
Beginning balance, All Other Net Unrealized Gain 47,316 25,410  
Beginning balance, Defined Benefit Pension and Post-retirement Plans (46,843) (41,798)  
Beginning balance, Total Accumulated OCI 7,024 (12,460)  
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax 1,093 3,416 (5,629)
Changes in HTM Related Net Unrealized Gain (6,522) (793)  
Changes in All Other Net Unrealized Gain 48,809 21,906  
Changes in Defined Benefit Pension and Post-retirement Plans (8,110) (5,045) 4,032
Changes in Total Accumulated OCI 35,270 19,484  
Ending balance, OTTI Related Net Unrealized (Loss) Gain (3,500) (4,593) (8,009)
Ending balance, HTM related Net Unrealized Gain 4,622 11,144 11,937
Ending balance, All Other Net Unrealized Gain 96,125 47,316 25,410
Ending balance, Defined Benefit Pension and Post-retirement Plans (54,953) (46,843) (41,798)
Ending balance, Total Accumulated OCI $ 42,294 $ 7,024 $ (12,460)