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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain on securities transactions $ 24,167 $ 27,842 $ 50,834 $ 54,071
Tax expense (4,743) (5,751) (10,338) (11,512)
Other operating expense (12,126) (12,435) (23,049) (23,043)
Net of tax (19,392) (22,059) (40,432) (42,495)
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 271 170 271 294
Tax expense (67) (42) (67) (72)
Net of tax 204 128 204 222
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan actuarial (gain) loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Other operating expense (400) (442) (821) (860)
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 (3) (4) (7) (8)
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 (403) (446) (828) (868)
Tax expense 99 109 203 213
Net of tax $ 304 $ 337 $ 625 $ 655