CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net change in unrealized losses, tax expense (benefit)	$ (87,132)	$ (21,972)
Reclassification adjustment for gains, tax expense	0	79
Amortization of unrealized gain on securities reclassified to held-to-maturity, tax expense	9	5
Change in unfunded pension liability related to unrealized loss, prior service cost and transition obligation, tax benefit	(9)	(5)
Reclassification adjustment related to derivatives, tax expense	0	0
Amortization of unrealized gain on terminated cash flow hedges, tax benefit	(13)	35
Equity method investment tax expense (benefit)	$ 0	$ 86