Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 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)	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 taxes	82,167		—		82,167
Other comprehensive income, net of income taxes	260,247		—		260,247
Balance, September 30, 2020	$	365,243	$	(73)	$	365,170
Balance, Dec. 31, 2020	$	335,032	$	836	$	335,868
Net change in unrealized gain (loss)	(216,176)		—		(216,176)
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(3,152)		—		(3,152)
Other comprehensive income, before income taxes	(219,328)		—		(219,328)
Federal and state income taxes	(52,632)		—		(52,632)
Other comprehensive income (loss), net of income taxes	(166,696)		—		(166,696)
Balance, September 30, 2021	$	168,336	$	836	$	169,172