Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Securities Available-for-sale, pledged	$ 842,424	$ 1,263,227
Mortgage servicing rights,fair value	$ 2,505	$ 2,729
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	490,439,070	489,072,101
Common stock, shares outstanding	490,379,705	488,490,352
Treasury stock, shares	59,365	581,749
Net unrealized (loss) gain on securities available for sale, tax	$ 3,757	$ (27,961)
Net unrealized loss on the non-credit portion of OTTI losses on securities, tax	2,517	3,338
Net unrealized loss on pension and post-retirement obligations, tax	$ 21,057	$ 32,121