CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 115,710	$ 87,268
Unrealized gains and losses on available for sale securities
Net (losses) gains arising during the period	(10,436)	26,068
Less reclassification adjustment for net losses included in net income	44	27
Total	(10,392)	26,095
Unrealized gains and losses on derivatives (cash flow hedges)
Net gains (losses) on derivatives arising during the period	174	(1,057)
Less reclassification adjustment for net losses included in net income	651	438
Total	825	(619)
Defined benefit pension plan
Amortization of actuarial net loss	280	172
Total other comprehensive (loss) income	(9,287)	25,648
Total comprehensive income	$ 106,423	$ 112,916