Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets:
Cash and due from banks	$ 252,283	$ 195,957
Interest-bearing deposits	98,205	96,062
Securities available for sale, at fair value	3,136,160	2,874,764
Securities held-to-maturity (fair value of $3,264,718 and $3,130,546)	3,107,529	2,973,727
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	155,630	143,874
Loans held for sale	107,633	57,391
Loans and leases	12,028,696	11,225,404
Allowance for loan and lease losses	(177,129)	(233,487)
Loans and leases, net	11,851,567	10,991,917
Deferred tax asset, net	68,681	105,665
Premises and equipment, net	134,562	147,379
Goodwill	529,887	529,887
Other intangible assets, net	10,270	15,690
Cash surrender value of life insurance policies	418,293	307,039
Prepaid FDIC premiums	16,323	37,946
Accrued interest receivable and other assets	259,742	237,042
Total assets	20,146,765	18,714,340
Liabilities and shareholders' equity:
Non-interest-bearing	2,881,131	2,473,693
Interest-bearing	11,649,704	11,182,332
Total deposits	14,530,835	13,656,025
Securities sold under agreements to repurchase and other short-term borrowings	1,076,160	1,164,706
Federal Home Loan Bank advances	1,827,612	1,252,609
Long-term debt	334,276	552,589
Accrued expenses and other liabilities	284,352	242,637
Total liabilities	18,053,235	16,868,566
Shareholders' equity:
Common stock, $.01 par value; Authorized - 200,000,000 shares Issued - 90,735,596 and 90,709,350 shares	907	907
Paid-in capital	1,145,620	1,145,346
Retained earnings	1,000,427	865,427
Less: Treasury stock, at cost (5,772,006 and 3,493,915 shares)	(172,807)	(134,641)
Accumulated other comprehensive loss	(32,266)	(60,204)
Total shareholders' equity	2,093,530	1,845,774
Total liabilities and shareholders' equity	20,146,765	18,714,340
Series A Preferred Stock [Member]
Shareholders' equity:
Preferred stock, $.01 par value; Authorized - 3,000,000 shares:	28,939	28,939
Series E Preferred Stock [Member]
Shareholders' equity:
Preferred stock, $.01 par value; Authorized - 3,000,000 shares:	$ 122,710	$ 0