Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Securities Available-for-sale, pledged		$ 1,263,227
Securities held to maturity, pledged			$ 1,930,533
Securities held to maturity, fair value	[1]		3,813,959
Mortgage servicing rights,fair value		2,729	$ 228,099
Other real estate owned and other repossessed assets covered by loss sharing agreements		$ 16,990
Preferred stock, par		$ 0.01	$ 0.01
Preferred stock, shares authorized		5,000,000	5,000,000
Preferred stock, Series A shares issued		515,000	515,000
Preferred stock, Series A shares outstanding		515,000	515,000
Common stock, par		$ 0.01	$ 0.01
Common stock, shares authorized		900,000,000	900,000,000
Common stock, shares issued		489,072,101	487,067,889
Common stock, shares outstanding		488,490,352	487,056,676
Treasury stock, shares		581,749	11,213
Net unrealized (loss) gain on securities available for sale, tax		$ (27,961)	$ 534
Net unrealized loss on the non-credit portion of other-than-temporary impairment losses on securities, tax		3,338	3,351
Net unrealized loss on pension and post-retirement obligations, tax		$ 32,121	$ 34,355

[1] 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, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).