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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 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 SecuritiesInvestment Securities Transferred from AFSEmployee Benefit PlansTotal
Balance, Dec. 31, 2021$69,775 $— $2,596 $72,371 
Net change in unrealized gain (loss)
(1,293,661)— — (1,293,661)
Transfer of net unrealized loss from AFS to investment securities267,509 (267,509)— — 
Reclassification adjustments included in earnings:
Interest revenue, Investment securities— 24,130 — 24,130 
Operating expense, Personnel— — (3,483)(3,483)
Gain on available for sale securities, net
(3,017)— — (3,017)
Other comprehensive loss, before income taxes(1,029,169)(243,379)(3,483)(1,276,031)
Federal and state income taxes(240,868)(56,960)(887)(298,715)
Other comprehensive loss, net of income taxes(788,301)(186,419)(2,596)(977,316)
Balance, September 30, 2022$(718,526)$(186,419)$— $(904,945)
Balance, Dec. 31, 2022$(664,618)$(172,337)$— $(836,955)
Net change in unrealized gain (loss)
(171,977)— — (171,977)
Reclassification adjustments included in earnings:
Interest revenue, Investment securities— 46,996 — 46,996 
Loss on available for sale securities, net3,010 — — 3,010 
Other comprehensive income (loss), before income taxes(168,967)46,996 — (121,971)
Federal and state income taxes(40,735)10,794 — (29,941)
Other comprehensive income (loss), net of income taxes(128,232)36,202 — (92,030)
Balance, September 30, 2023$(792,850)$(136,135)$— $(928,985)