Resale and Repurchase Agreements (Tables)

3 Months Ended

Mar. 31, 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
March 31, 2016
Total resale agreements, subject to master netting arrangements	$	1,375,000	$	(550,000	)	$	825,000	$	—	$	(825,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	1,503,503		(550,000		)	953,503		—		(953,503		)	—
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
March 31, 2016
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	253,016	$	315	$	300,000	$	553,331
Government-sponsored enterprise obligations	288,370		24,095		—		312,465
Agency mortgage-backed securities	336,448		28,917		200,000		565,365
Asset-backed securities	7,342		65,000		—		72,342
Total repurchase agreements, gross amount recognized	$	885,176	$	118,327	$	500,000	$	1,503,503
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