Accumulated Other Comprehensive Income (Loss) - Summary of Changes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 1,912,571	$ 1,875,645	$ 1,786,437
Other comprehensive income before reclassifications	(293,798)	(16,132)
Amounts reclassified from accumulated other comprehensive income	(466)	(3,591)
Period change	(294,264)	(19,723)	46,962
Ending balance	2,034,770	1,912,571	1,875,645
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	55,113	74,836	27,874
Period change	(294,264)	(19,723)	46,962
Ending balance	(239,151)	55,113	74,836
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	59,774	87,988
Other comprehensive income before reclassifications	(293,326)	(23,732)
Amounts reclassified from accumulated other comprehensive income	(943)	(4,482)
Period change	(294,269)	(28,214)
Ending balance	(234,495)	59,774	87,988
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(660)	(1,594)
Other comprehensive income before reclassifications	378	109
Amounts reclassified from accumulated other comprehensive income	412	825
Period change	790	934
Ending balance	130	(660)	(1,594)
Unrealized Gains (Losses) on Defined Benefit Plans
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(4,001)	(11,558)
Other comprehensive income before reclassifications	(850)	7,491
Amounts reclassified from accumulated other comprehensive income	65	66
Period change	(785)	7,557
Ending balance	$ (4,786)	$ (4,001)	$ (11,558)