Shareholders' Equity (Tables)

9 Months Ended

Sep. 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)	274,441		—		274,441
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(1,110)		—		(1,110)
Other comprehensive income, before income taxes	273,331		—		273,331
Federal and state income taxes1	66,993		—		66,993
Other comprehensive income, net of income taxes	206,338		—		206,338
Balance, September 30, 2019	$	135,339	$	(1,586)	$	133,753
Balance, Dec. 31, 2019	$	104,996	$	(73)	$	104,923
Net change in unrealized gain (loss)	347,985		—		347,985
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(5,571)		—		(5,571)
Other comprehensive income, before income taxes	342,414		—		342,414
Federal and state income taxes1	82,167		—		82,167
Other comprehensive income, net of income taxes	260,247		—		260,247
Balance, September 30, 2020	$	365,243	$	(73)	$	365,170

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