Resale and Repurchase Agreements (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021
Total resale agreements, subject to master netting arrangements	$	2,025,000	$	(400,000)	$	1,625,000	$	—	$	(1,625,000)	$	—
Total repurchase agreements, subject to master netting arrangements	3,379,582		(400,000)		2,979,582		—		(2,979,582)		—
December 31, 2020
Total resale agreements, subject to master netting arrangements	$	1,050,000	$	(200,000)	$	850,000	$	—	$	(850,000)	$	—
Total repurchase agreements, subject to master netting arrangements	2,256,113		(200,000)		2,056,113		—		(2,056,113)		—

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, 2021 and 2020, 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, 2021
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	600,866	$	33,373	$	9,259	$	643,498
Agency mortgage-backed securities	1,844,652		3,908		400,250		2,248,810
Non-agency mortgage-backed securities	32,299		—		—		32,299
Asset-backed securities	422,525		—		—		422,525
Other debt securities	32,450		—		—		32,450
Total repurchase agreements, gross amount recognized	$	2,932,792	$	37,281	$	409,509	$	3,379,582
December 31, 2020
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	150,305	$	—	$	—	$	150,305
Agency mortgage-backed securities	1,598,614		34,018		220,849		1,853,481
Non-agency mortgage-backed securities	62,742		—		—		62,742
Asset-backed securities	155,917		—		—		155,917
Other debt securities	33,668		—		—		33,668
Total repurchase agreements, gross amount recognized	$	2,001,246	$	34,018	$	220,849	$	2,256,113