Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 24,110	$ 44,367
Unrealized gains on available for sale securities:
Unrealized holding gains arising during period	40,450	20,291
Tax effect	(8,899)	(4,464)
Reclassification adjustment for losses included in net income		(2,998)
Tax effect		659
Net of tax amount	31,551	13,488
Unrealized losses on derivative financial instruments qualifying as cash flow hedges:
Unrealized holding losses arising during period	(28,512)	(2,651)
Tax effect	6,272	583
Reclassification adjustment for losses included in interest expense	(722)	(10)
Tax effect	159	2
Net of tax amount	(22,803)	(2,076)
Change in pension plan obligation:
Reclassification adjustment for changes included in net income		121
Tax effect		(26)
Net of tax amount		95
Other comprehensive income, net of tax	8,748	11,507
Comprehensive income	$ 32,858	$ 55,874