Consolidated Statements Of Condition (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Preferred stock, no par value
Preferred stock, 20,000,000 shares authorized	20,000,000	20,000,000	20,000,000
Common stock, no par value
Common stock, $1.00 stated value	$ 1.00	$ 1.00	$ 1.00
Common stock, 100,000,000 shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	48,422,294	46,881,108	46,766,420
Treasury stock, shares	85,424	76,053	75,373
Series C - $1,000 liquidation value; 126,312 shares issued and outstanding at September 30, 2015 and 126,467 shares issued and outstanding at December 31, 2014 and September 30, 2014
Preferred stock, liquidation value per share	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares outstanding	126,312	126,467	126,467
Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at September 30, 2015 and no shares issued and outstanding at December 31, 2014 and September 30, 2014
Preferred stock, liquidation value per share	$ 25	$ 0	$ 0
Preferred stock, shares outstanding	5,000,000	0	0