Resale and Repurchase Agreements (Tables)

3 Months Ended

Mar. 31, 2019

Resale and Repurchase Agreements [Abstract]

Resale and Repurchase Agreements [Table Text Block]

								Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet			Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset		Securities Collateral Received/Pledged			Net Amount
March 31, 2019
Total resale agreements, subject to master netting arrangements	$	1,000,000	$	(300,000	)	$	700,000	$	—	$	(700,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	1,760,376		(300,000		)	1,460,376		—		(1,460,376		)	—
December 31, 2018
Total resale agreements, subject to master netting arrangements	$	1,150,000	$	(450,000	)	$	700,000	$	—	$	(700,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	2,393,219		(450,000		)	1,943,219		—		(1,943,219		)	—

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

	Remaining Contractual Maturity of the Agreements
(In thousands)	Overnight and continuous		Up to 90 days		Greater than 90 days		Total
March 31, 2019
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	280,854	$	101,727	$	—	$	382,581
Government-sponsored enterprise obligations	47,900		—		—		47,900
Agency mortgage-backed securities	702,596		75,702		211,750		990,048
Non-agency mortgage-backed securities	135,495		—		—		135,495
Asset-backed securities	67,987		40,000		—		107,987
Other debt securities	96,365		—		—		96,365
Total repurchase agreements, gross amount recognized	$	1,331,197	$	217,429	$	211,750	$	1,760,376
December 31, 2018
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	387,541	$	150,000	$	100,000	$	637,541
Government-sponsored enterprise obligations	18,466		—		—		18,466
Agency mortgage-backed securities	882,744		31,774		213,752		1,128,270
Non-agency mortgage-backed securities	187,740		—		—		187,740
Asset-backed securities	322,680		—		—		322,680
Other debt securities	98,522		—		—		98,522
Total repurchase agreements, gross amount recognized	$	1,897,693	$	181,774	$	313,752	$	2,393,219