CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 96,413	$ 120,512	$ 213,141	$ 236,222
Unrealized gains and losses on available for sale securities
Net losses arising during the period	(52,269)	(1,471)	(91,161)	(11,907)
Less reclassification adjustment for net (gains) losses included in net income	0	76	(10)	120
Total	(52,269)	(1,395)	(91,171)	(11,787)
Unrealized gains and losses on derivatives (cash flow hedges)
Net (losses) gains on derivatives arising during the period	(23)	(147)	195	27
Less reclassification adjustment for net (gains) losses included in net income	(80)	534	306	1,185
Total	(103)	387	501	1,212
Defined benefit pension plan
Amortization of actuarial net loss	133	278	265	558
Other comprehensive (loss) income, net	(52,239)	(730)	(90,405)	(10,017)
Total comprehensive income	$ 44,174	$ 119,782	$ 122,736	$ 226,205