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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax $ 912,172 $ 875,297
Income tax benefit (expense) 37,209 7,840
Ending balance, net of tax 784,241 858,597
Unrealized Gains (Losses) on Securities    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax 84,716 116,078
Other comprehensive (loss) income before reclassifications (201,045) (48,979)
Reclassification adjustments included in net income 1,786 (1,587)
Income tax benefit (expense) 41,844 10,619
Net current-period other comprehensive (loss) income, net of tax (157,415) (39,947)
Ending balance, net of tax (72,699) 76,131
Unrealized Gains (Losses) on Derivatives    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (1,257) (17,091)
Other comprehensive (loss) income before reclassifications 20,546 11,023
Reclassification adjustments included in net income 1,322 1,568
Income tax benefit (expense) (4,593) (2,644)
Net current-period other comprehensive (loss) income, net of tax 17,275 9,947
Ending balance, net of tax 16,018 (7,144)
Net Gain (Loss)    
AOCI Attributable to Parent, Net of Tax    
Reclassification adjustments included in net income [1] 206 641
Total    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax 59,705 69,080
Other comprehensive (loss) income before reclassifications (180,499) (37,956)
Reclassification adjustments included in net income 3,314 622
Income tax benefit (expense) 37,209 7,840
Net current-period other comprehensive (loss) income, net of tax (139,976) (29,494)
Ending balance, net of tax (80,271) 39,586
Retirement Plans    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (23,754) (29,907)
Other comprehensive (loss) income before reclassifications 0 0
Reclassification adjustments included in net income 206 641
Income tax benefit (expense) (42) (135)
Net current-period other comprehensive (loss) income, net of tax 164 506
Ending balance, net of tax $ (23,590) $ (29,401)
[1] These AOCI components are included in the computation of net periodic pension cost (income) presented in “Note 8 – Employee Benefit Plans.”