Resale and Repurchase Agreements (Tables)

12 Months Ended

Dec. 31, 2023

Offsetting [Abstract]

Offsetting, Resale and Repurchase Agreements [Table Text Block]

							Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset on the Balance Sheet		Net Amounts Presented on the Balance Sheet		Financial Instruments Available for Offset		Securities Collateral Received/Pledged		Unsecured amount
December 31, 2023
Total resale agreements, subject to master netting arrangements	$	450,000	$	—	$	450,000	$	—	$	(450,000)	$	—
Total repurchase agreements, subject to master netting arrangements	2,647,510		—		2,647,510		—		(2,647,510)		—
December 31, 2022
Total resale agreements, subject to master netting arrangements	$	1,025,000	$	(200,000)	$	825,000	$	—	$	(825,000)	$	—
Total repurchase agreements, subject to master netting arrangements	2,881,874		(200,000)		2,681,874		—		(2,681,874)		—

Schedule of Underlying Assets of Repurchase Agreements [Table Text Block]

The table below shows the remaining contractual maturities of repurchase agreements outstanding at December 31, 2023 and 2022, in addition to the various types of marketable securities that have been pledged by the Company as collateral for these borrowings.

	Remaining Contractual Maturity of the Agreements
(In thousands)	Overnight and continuous		Up to 90 days		Greater than 90 days		Total
December 31, 2023
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	170,293	$	—	$	—	$	170,293
Government-sponsored enterprise obligations	8,749		—		—		8,749
Agency mortgage-backed securities	1,833,840		27,264		17,200		1,878,304
Non-agency mortgage-backed securities	10,566		—		—		10,566
Asset-backed securities	516,726		9,606		20,000		546,332
Other debt securities	33,265		—		—		33,265
Total repurchase agreements, gross amount recognized	$	2,573,439	$	36,870	$	37,200	$	2,647,509
December 31, 2022
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	488,053	$	26,928	$	12,460	$	527,441
Agency mortgage-backed securities	1,792,314		21,744		204,500		2,018,558
Non-agency mortgage-backed securities	40,950		—		—		40,950
Asset-backed securities	293,001		—		—		293,001
Other debt securities	1,924		—		—		1,924
Total repurchase agreements, gross amount recognized	$	2,616,242	$	48,672	$	216,960	$	2,881,874