Consolidated Condensed Statements of Condition (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Cash and due from banks (Restricted - $1.2 million on June 30, 2013; and $ - on June 30, 2012 and December 31, 2012)	$ 382,601,000	$ 469,879,000	$ 330,931,000
Total cash and cash equivalents (Restricted - $1.2 million on June 30, 2013; and $ - on June 30, 2012 and December 31, 2012)	1,036,896,000	1,106,262,000	856,435,000
Loans, net of unearned income (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012) (Note 4)	16,197,046,000	16,708,582,000	16,185,763,000
Less: Allowance for loan losses (Restricted - $3.8 million on June 30, 2013; $6.0 million on June 30, 2012; and $4.3 million on December 31, 2012) (Note 4)	261,934,000	276,963,000	321,051,000
Total net loans (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012)	15,935,112,000	16,431,619,000	15,864,712,000
Other assets (Restricted - $1.7 million on June 30, 2013; $2.6 million on June 30, 2012; and $1.9 million on December 31, 2012)	1,604,889,000	1,670,840,000	1,848,890,000
Total assets (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012)	25,133,274,000	25,520,140,000	25,492,955,000
Term borrowings (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012)	1,800,255,000	2,226,482,000	2,294,224,000
Total liabilities (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012)	22,586,923,000	23,010,934,000	22,978,549,000
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	240,554,552	243,597,780	248,810,099
Preferred stock, no par value	$ 0	$ 0	$ 0
Preferred Stock Liquidation Preference Value	100,000	0	0
Preferred stock, shares authorized	1,000	0	0
Preferred stock, shares issued	1,000	0	0
Variable Interest Entity, Primary Beneficiary [Member]
Cash and due from banks (Restricted - $1.2 million on June 30, 2013; and $ - on June 30, 2012 and December 31, 2012)	1,200,000	0	0
Total cash and cash equivalents (Restricted - $1.2 million on June 30, 2013; and $ - on June 30, 2012 and December 31, 2012)	1,200,000	0	0
Loans, net of unearned income (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012) (Note 4)	100,000,000	100,000,000	100,000,000
Less: Allowance for loan losses (Restricted - $3.8 million on June 30, 2013; $6.0 million on June 30, 2012; and $4.3 million on December 31, 2012) (Note 4)	3,800,000	4,300,000	6,000,000
Total net loans (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012)	100,000,000	100,000,000	100,000,000
Other assets (Restricted - $1.7 million on June 30, 2013; $2.6 million on June 30, 2012; and $1.9 million on December 31, 2012)	1,700,000	1,900,000	2,600,000
Total assets (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012)	100,000,000	100,000,000	100,000,000
Term borrowings (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012)	100,000,000	100,000,000	100,000,000
Total liabilities (Restricted - $.1 billion on June 30, 2013; June 30, 2012; and December 31, 2012)	$ 100,000,000	$ 100,000,000	$ 100,000,000