Consolidated Statements of Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Statement Of Financial Position [Abstract]
Securities available-for-sale, pledged	$ 58,540		$ 79,905
Securities held to maturity, pledged	4,749,889		4,945,905
Securities held to maturity, fair value	7,317,015	[1]	7,445,244	[2]
Other real estate owned covered by loss sharing agreements	35,797		37,477
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	600,000,000		600,000,000
Common stock, shares issued	442,659,460		440,873,285
Common stock, shares outstanding	442,648,147		440,809,365
Treasury stock, shares	11,313		63,920
Net unrealized gain on securities available for sale, tax	1,720		171
Net unrealized loss on the non-credit portion of other-than-temporary impairment losses on securities, tax	3,454		3,586
Net unrealized loss on pension and post-retirement obligations, tax	$ 20,056		$ 21,126

[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 September 30, 2014, the non-credit portion of OTTI recorded in AOCL was $8.9 million (before taxes).

[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, 2013, the non-credit portion of OTTI recorded in AOCL was $9.2 million (before taxes).