Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Condensed Consolidated Statements of Comprehensive (Loss) Income
Net (loss) income	$ (84,935)	$ 41,460	$ (60,825)	$ 85,827
Unrealized gains on available for sale securities:
Unrealized holding gains arising during period	6,208	22,766	46,658	37,061
Tax effect	(1,366)	(5,008)	(10,265)	(8,153)
Reclassification adjustment for losses included in net income		118		3,116
Tax effect		(26)		(686)
Net of tax amount	4,842	17,850	36,393	31,338
Unrealized losses on derivative financial instruments qualifying as cash flow hedges:
Unrealized holding losses arising during period	(4,359)	(11,275)	(34,315)	(13,943)
Tax effect	959	2,480	7,549	3,067
Reclassification adjustment for (gains) included in interest expense	1,964	(350)	2,686	(343)
Tax effect	(432)	77	(591)	75
Net of tax amount	(1,868)	(9,068)	(24,671)	(11,144)
Change in pension plan and retiree medical plan obligation:
Reclassification adjustment for changes included in net income		7,767		7,888
Tax effect		(1,709)		(1,735)
Net of tax amount		6,058		6,153
Other comprehensive income, net of tax	2,974	14,840	11,722	26,347
Comprehensive (loss) income	$ (81,961)	$ 56,300	$ (49,103)	$ 112,174