Consolidated Statements of Condition (Parenthetical) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Securities Available-for-sale, pledged	$ 1,447,566,000	$ 1,372,238,000
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	490,439,070
Common stock, shares outstanding	466,360,703	467,346,781
Treasury stock, shares	24,078,367	23,092,289
Net unrealized (loss) gain on securities available for sale, tax	$ 4,607	$ 9,424
Net unrealized loss on pension and post-retirement obligations, tax	21,685,000	22,191,000
Cash flow hedges tax component	13,242,000	$ 333,000
Debt Securities, allowance for credit losses	$ 0