CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 146,551	$ 116,728
Unrealized gains and losses on available for sale securities
Net gains (losses) arising during the period	17,170	(38,892)
Less reclassification adjustment for net gains included in net income	0	(10)
Total	17,170	(38,902)
Unrealized gains and losses on derivatives (cash flow hedges)
Net gains on derivatives arising during the period	2,798	218
Less reclassification adjustment for net losses included in net income	379	386
Total	3,177	604
Defined benefit pension and postretirement benefit plans
Amortization of actuarial net loss	8	132
Other comprehensive income, net	20,355	(38,166)
Total comprehensive income	$ 166,906	$ 78,562