Consolidated Condensed Statements Of Condition (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Consolidated Condensed Statements Of Condition [Abstract]
Restricted cash and due from banks	$ 1,700,000	$ 4,900,000	$ 4,900,000
Restricted total cash and cash equivalents	1,700,000	4,900,000	4,900,000
Restricted loans, unearned income	200,000,000	600,000,000	700,000,000
Restricted allowance for loan losses	10,400,000	31,800,000	39,800,000
Restricted total net loans	100,000,000	600,000,000	700,000,000
Restricted other assets	4,500,000	13,400,000	16,700,000
Restricted total assets	200,000,000	600,000,000	700,000,000
Restricted noninterest-bearing deposits	0	0	1,100,000
Restricted total deposits	0	0	1,100,000
Restricted term borrowings	200,000,000	600,000,000	700,000,000
Restricted other liabilities	0	100,000	100,000
Restricted total liabilities	$ 200,000,000	$ 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	252,666,860	257,468,092	263,335,004