Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016		Dec. 31, 2015
Securities held to maturity, pledged	$ 1,741,622		$ 2,152,939
Securities held to maturity, fair value	4,093,734	[1]	6,108,529	[2]
Other real estate owned, covered by loss sharing agreements	$ 20,083		$ 25,817
Preferred stock, par	$ 0.01		$ 0.01
Preferred stock, shares authorized	5,000,000		5,000,000
Preferred stock, issued	0		0
Common stock, par	$ 0.01		$ 0.01
Common stock, shares authorized	900,000,000		900,000,000
Common stock, shares issued	487,016,052		484,968,024
Common stock, shares outstanding	487,009,706		484,943,308
Treasury stock, shares	6,346		24,716
Net unrealized gain on securities available for sale, tax	$ 3,735		$ 2,153
Net unrealized loss on the non-credit portion of other-than-temporary impairment losses on securities, tax	3,376		3,400
Net unrealized loss on pension and post-retirement obligations, tax	$ 35,388		$ 37,279

[1] Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in Accumulated Other Comprehensive Loss ("AOCL"). At June 30, 2016, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.

[2] Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in AOCL. At December 31, 2015, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.