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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Comprehensive Income Note[Abstract]    
Beginning balance, OTTI Related Net Unrealized Loss $ (3,500)  
Beginning balance, HTM related Net Unrealized Gain 4,622  
Beginning balance, All Other Net Unrealized Gain 96,125  
Beginning balance, Defined Benefit Pension and Post-retirement Plans (54,953)  
Beginning balance, Total Accumulated OCI 42,294  
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income 238 117
Changes in HTM Related Net Unrealized Gain (585)  
Changes in All Other Net Unrealized Gain 10,109  
Changes in Defined Benefit Pension and Post-retirement Plans 928 742
Changes in Total Accumulated OCI 10,690 (4,248)
Ending balance, OTTI Related Net Unrealized Loss (3,262)  
Ending balance, HTM related Net Unrealized Gain 4,037  
Ending balance, All Other Net Unrealized Gain 106,234  
Ending balance, Defined Benefit Pension and Post-retirement Plans (54,025)  
Ending balance, Total Accumulated OCI $ 52,984