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Accumulated Other Comprehensive Income (Loss) - Changes in Balances of Each Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 1,786,437	$ 1,408,260
Other comprehensive income before reclassifications	29,326	20,681
Amounts reclassified from accumulated other comprehensive income	(3,544)	(854)
Total other comprehensive income (loss), net of tax	25,782	19,827
Ending balance	1,777,960	1,455,848
Total
Accumulated Other Comprehensive Income (Loss)
Beginning balance	27,874	(21,422)
Ending balance	53,656	(1,595)
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Beginning balance	38,872	(6,343)
Other comprehensive income before reclassifications	30,364	20,990
Amounts reclassified from accumulated other comprehensive income	(3,643)	(901)
Total other comprehensive income (loss), net of tax	26,721	20,089
Ending balance	65,593	13,746
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(1,141)	(559)
Other comprehensive income before reclassifications	(1,038)	(309)
Amounts reclassified from accumulated other comprehensive income	99	47
Total other comprehensive income (loss), net of tax	(939)	(262)
Ending balance	(2,080)	(821)
Unrealized Gains (Losses) on Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(9,857)	(14,520)
Other comprehensive income 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	$ (9,857)	$ (14,520)

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