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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Stockholders' Equity Note [Abstract]      
Beginning balance, OTTI Related Net Unrealized Loss $ (3,500) $ (4,593)  
Beginning balance, HTM related Net Unrealized Gain 4,622 11,144  
Beginning balance, All Other Net Unrealized Gain 96,125 47,316  
Beginning balance, Defined Benefit Pension and Post-retirement Plans (54,953) (46,843)  
Beginning balance, Total Accumulated OCI 42,294 7,024  
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income 1,842 1,093  
Changes in HTM Related Net Unrealized Gain (2,028) (6,522)  
Unrealized holding gains during the period 25,266 48,809  
Changes in defined benefit pension and post- retirement plans (13,334) (8,110) (5,045)
Other comprehensive income 11,746 35,270  
Ending balance, OTTI Related Net Unrealized Loss (1,658) (3,500) (4,593)
Ending balance, HTM related Net Unrealized Gain 2,594 4,622 11,144
Ending balance, All Other Net Unrealized Gain 121,391 96,125 47,316
Ending balance, Defined Benefit Pension and Post-retirement Plans (68,287) (54,953) (46,843)
Ending balance, Total Accumulated OCI $ 54,040 $ 42,294 $ 7,024