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Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain on securities transactions $ (27,842) $ (25,207) $ (54,071) $ (48,344)
Tax expense (5,751) (8,248) (11,512) (15,637)
Other operating expense 12,435 9,970 23,043 19,928
Available-for-sale securities:        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net of tax 128 0 222 0
Net retirement plan actuarial (gain) loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Other operating expense (442) (397) (860) (754)
Net retirement plan prior service cost        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Other operating expense (4) 15 (8) (8)
Employee Benefit Plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain on securities transactions (446) (382) (868) (762)
Tax benefit 109 153 213 305
Net of tax (337) (229) (655) (457)
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 (170) 0 (294) 0
Tax expense (42) 0 (72) 0
Net of tax $ 128 $ 0 $ 222 $ 0