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Stockholders' Equity and Comprehensive Income Stockholders' Equity and Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance December,       $ 54,040         $ 54,040     $ 24,851
Amount reclassified from AOCI, HTM                 (1,025) (1,581) (1,484)  
Amounts reclassified from AOCI,All other                 (15,301) (6,118) (1,821)  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax                 41,635 (13,334) (8,110)  
Other comprehensive (loss) income 7,768 (2,195) (62,643) 27,881 (30,971) 26,507 5,520 10,690        
Accumulated Other-than-Temporary Impairment [Member]
                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance December,       (1,658)       (3,500) (1,658) (3,500)   (1,599)
OCI before reclassifications                 50 1,660    
Amount reclassified from AOCI                 9 182 321  
Other comprehensive (loss) income                 59 1,842    
Accumulated Defined Benefit Plans Adjustment [Member]
                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance December,       (68,287)       (54,953) (68,287) (54,953)   (26,652)
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans                 38,775 (17,268) (10,919)  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax                 2,860 3,934    
Accumulated other comprehensive income (loss) [Member]
                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance December,       54,040       42,294 54,040 42,294   24,851
OCI before reclassifications                 (15,732) 15,329    
Amount reclassified from AOCI                 (13,457) (3,583)    
Other comprehensive (loss) income                 (29,189) 11,746 35,270  
Held-to-maturity Securities [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance December,       2,594       4,622 2,594 4,622   1,467
OCI before reclassifications                 (102) (447)    
Other comprehensive (loss) income                 (1,127) (2,028)    
Available-for-sale Securities [Member]
                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance December,       121,391       96,125 121,391 96,125   51,635
OCI before reclassifications                 (54,455) 31,384    
Other comprehensive (loss) income                 (69,756) 25,266    
Investments [Member]
                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance December,       122,327       97,247 122,327 97,247   51,503
OCI before reclassifications                 (54,507) 32,597    
Amount reclassified from AOCI                 (16,317) (7,517)    
Other comprehensive (loss) income                 $ (70,824) $ 25,080