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Accumulated Other Comprehensive Income (Loss) - Summary of Changes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 1,875,645	$ 1,786,437
Other comprehensive income (loss) before reclassifications	(37,804)	29,326
Amounts reclassified from accumulated other comprehensive income	(1,222)	(3,544)
Total other comprehensive income (loss), net of tax	(39,026)	25,782
Ending balance	1,805,856	1,777,960
Total
Accumulated Other Comprehensive Income (Loss)
Beginning balance	74,836	27,874
Ending balance	35,810	53,656
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Beginning balance	87,988	38,872
Other comprehensive income (loss) before reclassifications	(37,850)	30,364
Amounts reclassified from accumulated other comprehensive income	(1,421)	(3,643)
Total other comprehensive income (loss), net of tax	(39,271)	26,721
Ending balance	48,717	65,593
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(1,594)	(1,141)
Other comprehensive income (loss) before reclassifications	46	(1,038)
Amounts reclassified from accumulated other comprehensive income	199	99
Total other comprehensive income (loss), net of tax	245	(939)
Ending balance	(1,349)	(2,080)
Unrealized Gains (Losses) on Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(11,558)	(9,857)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss), net of tax	0	0
Ending balance	$ (11,558)	$ (9,857)

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