Securities Financing Activities (Tables)

12 Months Ended

Dec. 31, 2015

Transfers and Servicing [Abstract]

Schedule of assets and liabilities subject to enforceable master netting arrangements

The Company offsets the assets and liabilities under netting arrangements for the balance sheet presentation of securities purchased under agreements to resell and securities sold under agreements to repurchase provided certain criteria are met that permit balance sheet netting.

	Gross Amounts Recognized		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amount Presented in the Consolidated Balance Sheets		Financial Instruments Collateral Received/ Pledged (1)		Cash Collateral Received/ Pledged (1)		Net Amount
	(In Thousands)
December 31, 2015
Securities purchased under agreement to resell:
Subject to a master netting arrangement	$	5,282,661	$	5,003,555	$	279,106	$	279,106	$	—	$	—
Securities sold under agreements to repurchase:
Subject to a master netting arrangement	$	5,080,164	$	5,003,555	$	76,609	$	76,609	$	—	$	—
December 31, 2014
Securities purchased under agreement to resell:
Subject to a master netting arrangement	$	3,100,200	$	2,533,661	$	566,539	$	566,539	$	—	$	—
Securities sold under agreements to repurchase:
Subject to a master netting arrangement	$	2,969,345	$	2,533,661	$	435,684	$	435,684	$	—	$	—

(1) The actual amount of collateral received/pledged is limited to the asset/liability balance and does not include excess collateral received/pledged. When excess collateral exists the collateral shown in the table above has been allocated based on the percentage of the actual amount of collateral posted.

Schedule of securities sold under agreements to repurchase

The following table presents the Company's related activity, by collateral type and remaining contractual maturity.

	December 31, 2015
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30 - 90 Days		Greater Than 90 Days		Total
	(In Thousands)
Securities Sold Under Agreements Repurchase:
U.S. Treasury and other U.S. government agencies	$	3,214,085	$	232,924	$	518,623	$	—	$	3,965,632
Mortgage-backed securities	—		—		976,449		—		976,449
Collateralized mortgage obligations	—		—		138,083		—		138,083
Total	$	3,214,085	$	232,924	$	1,633,155	$	—	$	5,080,164