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Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain on securities transactions $ 25,715 $ 26,361 $ 76,549 $ 80,432
Tax (expense) benefit (5,478) (5,427) (15,816) (16,939)
Other operating expense (11,298) (12,493) (35,451) (36,908)
Net of tax 20,206 20,902 60,638 63,397
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 133 30 404 324
Tax (expense) benefit (32) (7) (99) (79)
Net of tax 101 23 305 245
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan actuarial loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Other operating expense (411) (430) (1,232) (1,289)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan prior service cost        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Other operating expense (4) (4) (11) (12)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee benefit plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain on securities transactions (415) (434) (1,243) (1,301)
Tax (expense) benefit 102 106 305 319
Net of tax $ (313) $ (328) $ (938) $ (982)