Resale and Repurchase Agreements (Tables)

9 Months Ended

Sep. 30, 2016

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
September 30, 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	1,746,251		(550,000		)	1,196,251		—		(1,196,251		)	—
December 31, 2015
Total resale agreements, subject to master netting arrangements	$	1,425,000	$	(550,000	)	$	875,000	$	—	$	(875,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	1,956,582		(550,000		)	1,406,582		—		(1,406,582		)	—

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
September 30, 2016
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	228,435	$	—	$	300,000	$	528,435
Government-sponsored enterprise obligations	185,224		—		2,728		187,952
Agency mortgage-backed securities	367,145		2,908		252,982		623,035
Asset-backed securities	306,829		100,000		—		406,829
Total repurchase agreements, gross amount recognized	$	1,087,633	$	102,908	$	555,710	$	1,746,251
December 31, 2015
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	210,346	$	—	$	300,000	$	510,346
Government-sponsored enterprise obligations	356,970		—		24,096		381,066
Agency mortgage-backed securities	579,974		2,292		225,904		808,170
Asset-backed securities	212,000		45,000		—		257,000
Total repurchase agreements, gross amount recognized	$	1,359,290	$	47,292	$	550,000	$	1,956,582