Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

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, 2019	$	104,996	$	(73)	$	104,923
Net change in unrealized gain (loss)	297,843		—		297,843
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(3)		—		(3)
Other comprehensive income, before income taxes	297,840		—		297,840
Federal and state income taxes	71,471		—		71,471
Other comprehensive income, net of income taxes	226,369		—		226,369
Balance, March 31, 2020	$	331,365	$	(73)	$	331,292
Balance, Dec. 31, 2020	$	335,032	$	836	$	335,868
Net change in unrealized gain (loss)	(150,131)		—		(150,131)
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(467)		—		(467)
Other comprehensive income, before income taxes	(150,598)		—		(150,598)
Federal and state income taxes	(36,139)		—		(36,139)
Other comprehensive income (loss), net of income taxes	(114,459)		—		(114,459)
Balance, March 31, 2021	$	220,573	$	836	$	221,409