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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [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 75 272 313 389
Changes in HTM Related Net Unrealized Gain     (898)  
Changes in All Other Net Unrealized Gain     14,938  
Changes in Defined Benefit Pension and Post-retirement Plans 929 743 1,857 1,485
Other comprehensive income 5,520 18,368 16,210 14,120
Ending balance, OTTI Related Net Unrealized Loss (3,187)   (3,187)  
Ending balance, HTM related Net Unrealized Gain 3,724   3,724  
Ending balance, All Other Net Unrealized Gain 111,063   111,063  
Ending balance, Defined Benefit Pension and Post-retirement Plans (53,096)   (53,096)  
Ending balance, Total Accumulated OCI $ 58,504   $ 58,504