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Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on securities transactions $ 26,229 $ 23,137
Tax expense (5,761) (7,388)
Unrealized gains and losses on available-for-sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net of tax 94 0
Net retirement plan actuarial (gain) loss    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax (417) (357)
Net retirement plan prior service cost    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax (4) (23)
Employee Benefit Plans    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax (421) (380)
Tax benefit 103 152
Net of tax (318) (228)
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains and losses on available-for-sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on securities transactions 124 0
Tax expense (30) 0
Net of tax $ 94 $ 0