Consolidated Condensed Statements Of Condition (Parenthetical) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Consolidated Condensed Statements Of Condition [Abstract]
Restricted cash and due from banks	$ 0	$ 4,900,000	$ 1,800,000
Restricted total cash and cash equivalents	0	4,900,000	1,800,000
Restricted loans, unearned income	100,000,000	600,000,000	700,000,000
Restricted allowance for loan losses	6,000,000	31,800,000	33,000,000
Restricted total net loans	100,000,000	600,000,000	700,000,000
Restricted other assets	2,600,000	13,400,000	13,900,000
Restricted total assets	100,000,000	600,000,000	700,000,000
Restricted noninterest-bearing deposits	0	0	900,000
Restricted total deposits	0	0	900,000
Restricted term borrowings	100,000,000	600,000,000	700,000,000
Restricted other liabilities	0	100,000	0
Restricted total liabilities	$ 100,000,000	$ 600,000,000	$ 700,000,000
Common stock, par value	$ 0.625	$ 0.625	$ 0.625
Common stock, shares authorized	400,000,000	400,000,000	400,000,000
Common stock, shares issued	248,810,099	257,468,092	263,689,516