Consolidated Statements Of Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Preferred stock, no par value	$ 0	$ 0
Preferred stock, 20,000,000 shares authorized	20,000,000	20,000,000
Common stock, no par value	$ 0	$ 0
Common stock, $1.00 stated value	$ 1.00	$ 1.00
Common stock, 100,000,000 shares authorized	100,000,000	100,000,000
Common stock, shares issued	51,978,289	48,468,894
Treasury stock, shares	97,749	85,615
Held-to-maturity securities, fair value	$ 607,602	$ 878,111
Series C preferred stock
Preferred stock, liquidation value per share	$ 1,000	$ 1,000
Preferred stock, shares issued	126,257	126,287
Preferred stock, shares outstanding	126,257	126,287
Series D preferred stock
Preferred stock, liquidation value per share	$ 25	$ 25
Preferred stock, shares issued	5,000,000	5,000,000
Preferred stock, shares outstanding	5,000,000	5,000,000