Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2023

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		Investment Securities Transferred from AFS		Employee Benefit Plans		Total
Balance, Dec. 31, 2021	$	69,775	$	—	$	2,596	$	72,371
Net change in unrealized gain (loss)	(881,577)		—		—		(881,577)
Transfer of net unrealized loss from AFS to investment securities	267,509		(267,509)		—		—
Reclassification adjustments included in earnings:
Interest revenue, Investment securities	—		2,455		—		2,455
Gain on available for sale securities, net	(2,125)		—		—		(2,125)
Other comprehensive loss, before income taxes	(616,193)		(265,054)		—		(881,247)
Federal and state income taxes	(144,215)		(62,033)		—		(206,248)
Other comprehensive loss, net of income taxes	(471,978)		(203,021)		—		(674,999)
Balance, June 30, 2022	$	(402,203)	$	(203,021)	$	2,596	$	(602,628)
Balance, Dec. 31, 2022	$	(664,618)	$	(172,337)	$	—	$	(836,955)
Net change in unrealized gain (loss)	(36,363)		—		—		(36,363)
Reclassification adjustments included in earnings:
Interest revenue, Investment securities	—		32,084		—		32,084
Loss on available for sale securities, net	3,010		—		—		3,010
Other comprehensive income (loss), before income taxes	(33,353)		32,084		—		(1,269)
Federal and state income taxes	(8,839)		7,287		—		(1,552)
Other comprehensive income (loss), net of income taxes	(24,514)		24,797		—		283
Balance, June 30, 2023	$	(689,132)	$	(147,540)	$	—	$	(836,672)