Resale and Repurchase Agreements (Tables)

6 Months Ended

Jun. 30, 2017

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
June 30, 2017
Total resale agreements, subject to master netting arrangements	$	1,325,000	$	(700,000	)	$	625,000	$	—	$	(625,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	1,702,934		(700,000		)	1,002,934		—		(1,002,934		)	—
December 31, 2016
Total resale agreements, subject to master netting arrangements	$	1,275,000	$	(550,000	)	$	725,000	$	—	$	(725,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	2,221,065		(550,000		)	1,671,065		—		(1,671,065		)	—

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
June 30, 2017
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	330,173	$	1,728	$	450,000	$	781,901
Government-sponsored enterprise obligations	180,496		—		—		180,496
Agency mortgage-backed securities	379,441		70,325		200,000		649,766
Asset-backed securities	10,771		80,000		—		90,771
Total repurchase agreements, gross amount recognized	$	900,881	$	152,053	$	650,000	$	1,702,934
December 31, 2016
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	294,600	$	—	$	300,000	$	594,600
Government-sponsored enterprise obligations	147,694		—		3,237		150,931
Agency mortgage-backed securities	693,851		24,380		252,473		970,704
Asset-backed securities	474,830		30,000		—		504,830
Total repurchase agreements, gross amount recognized	$	1,610,975	$	54,380	$	555,710	$	2,221,065