Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Stockholders' Equity Note [Abstract]

Accumulated Other Comprehensive Income (Loss) [Table Text Block]

A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):

	Unrealized Gain (Loss) on
	Available for Sale Securities		Employee Benefit Plans		Total
Balance, Dec. 31, 2018	$	(70,999)	$	(1,586)	$	(72,585)
Net change in unrealized gain (loss)	228,156		—		228,156
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(1,105)		—		(1,105)
Other comprehensive income, before income taxes	227,051		—		227,051
Federal and state income taxes1	55,897		—		55,897
Other comprehensive income, net of income taxes	171,154		—		171,154
Balance, June 30, 2019	$	100,155	$	(1,586)	$	98,569
Balance, Dec. 31, 2019	$	104,996	$	(73)	$	104,923
Net change in unrealized gain (loss)	354,765		—		354,765
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(5,580)		—		(5,580)
Other comprehensive income, before income taxes	349,185		—		349,185
Federal and state income taxes1	83,792		—		83,792
Other comprehensive income, net of income taxes	265,393		—		265,393
Balance, June 30, 2020	$	370,389	$	(73)	$	370,316

¹ Calculated using a 25 percent blended federal and state statutory tax rate.