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Other Comprehensive Income (Loss) (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Tax expense $ (8,248) $ (6,760) $ (15,637) $ (13,656)
Available-for-sale securities:        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total before tax 0 240 0 472
Tax benefit 0 (96) 0 (189)
Net of tax 0 144 0 283
Net retirement plan actuarial (gain) loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total before tax [1],[2] (397) (326) (754) (669)
Tax benefit 159 131 302 268
Net of tax (238) (195) (452) (401)
Net retirement plan prior service cost        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total before tax [1],[2] 15 (8) (8) (38)
Tax benefit (6) 3 3 15
Net of tax 9 (5) (5) (23)
Employee Benefit Plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total before tax [1] (382) (334) (762) (707)
Tax benefit [1] 153 134 305 283
Net of tax [1] (229) (200) (457) (424)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Available-for-sale securities:        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain on securities transactions [1] 0 240 0 472
Tax expense [1] 0 (96) 0 (189)
Net of tax [1] $ 0 $ 144 $ 0 $ 283
[1] Amounts in parentheses indicated debits in income statement.
[2] The accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit cost (See Note 10 - “Employee Benefit Plan”).