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Other Comprehensive Income (Loss) (Reclassifications Out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income tax expense $ (11,969) $ (9,281) $ (30,788) $ (26,798)
Net income 26,575 22,906 74,466 65,235
Net of tax 36 115 105 456
Unrealized gains on securities available for sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Compensation and employee benefits, amortization of actuarial losses (gains) 0 (43) 0 54
Income tax expense 0 17 0 (22)
Net of tax 0 (26) 0 32
Post-retirement obligations [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Compensation and employee benefits, amortization of actuarial losses (gains) 61 236 183 708
Income tax expense (25) (95) (78) (284)
Net of tax 36 141 105 424
Reclassification adjustment [Member] | Unrealized gains on securities available for sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net gain on securities transactions 0 (43) 0 54
Income tax expense 0 17 0 (22)
Net income $ 0 $ (26) $ 0 $ 32