CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 210,799	$ 168,376
Due from banks - interest-bearing	101,375	76,438
Federal funds sold	156,000
Securities available-for-sale - cost $6,699,181 and $7,445,999 at March 31, 2012 and December 31, 2011, respectively:
Securities pledged as collateral	38,817	37,861
Held in portfolio	6,799,893	7,534,040
Securities held-to-maturity - fair value $996,455 and $473,903 at March 31, 2012 and December 31, 2011, respectively	996,613	467,680
Trading securities	82,589	61,975
Loans and leases, excluding covered loans	12,747,902	12,309,385
Less: Allowance for loan and lease losses	266,077	262,557
Loans and leases, excluding covered loans, net	12,481,825	12,046,828
Covered loans, net of allowance for loan losses	1,335,685	1,417,289
Net loans and leases	13,817,510	13,464,117
Premises and equipment, net	143,238	143,641
Deferred tax asset	149,532	155,529
Goodwill	487,233	486,383
Customer-relationship intangibles, net	34,484	36,370
Affordable housing investments	143,916	121,039
Customers' acceptance liability	1,343	1,702
Other real estate owned ($78,456 and $98,550 covered by FDIC loss share at March 31, 2012 and December 31, 2011, respectively)	107,530	129,340
FDIC indemnification asset	185,392	204,259
Other assets	582,225	577,541
Total assets	24,038,489	23,666,291
Liabilities
Demand deposits	11,550,000	11,146,627
Interest checking deposits	1,950,035	2,034,815
Money market deposits	5,946,064	5,954,886
Savings deposits	365,773	339,858
Time deposits-under $100,000	234,180	251,782
Time deposits-$100,000 and over	741,685	659,614
Total deposits	20,787,737	20,387,582
Short-term borrowings	222,776	50,000
Long-term debt	482,024	697,778
Reserve for off-balance sheet credit commitments	24,067	23,097
Acceptances outstanding	1,343	1,702
Other liabilities	277,541	316,640
Total liabilities	21,795,488	21,476,799
Redeemable noncontrolling interest	43,436	44,643
Commitments and contingencies
Shareholders' Equity
Common stock, par value $1.00 per share; 75,000,000 shares authorized; 53,885,886 shares issued at March 31, 2012 and December 31, 2011	53,886	53,886
Additional paid-in capital	489,717	489,200
Accumulated other comprehensive income	81,342	72,372
Retained earnings	1,644,861	1,611,969
Treasury shares, at cost - 1,225,218 and 1,386,705 shares at March 31, 2012 and December 31, 2011, respectively	(70,241)	(82,578)
Total shareholders' equity	2,199,565	2,144,849
Total liabilities and shareholders' equity	$ 24,038,489	$ 23,666,291