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Other Comprehensive Income (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net gain on securities transactions $ 0 $ 96
Income tax expense (8,368) (8,736)
Net of tax 23,508 20,973
Reclassification adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net of tax 37 198
Reclassification adjustment [Member] | Unrealized gains on securities available for sale [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net gain on securities transactions 0 96
Income tax expense 0 (39)
Net of tax 0 57
Reclassification adjustment [Member] | Post-retirement obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Compensation and employee benefits (1) 61 236
Income tax expense (24) (95)
Net of tax $ 37 $ 141