CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 301,106	$ 151,969
Due from banks - interest-bearing	1,045,608	246,336
Federal funds sold and securities purchased under resale agreements	200,000	17,100
Securities available-for-sale - cost $6,912,931 and $9,057,238 at September 30, 2013 and December 31, 2012, respectively:
Securities pledged as collateral	13,638	48,697
Held in portfolio	6,881,492	9,157,292
Securities held-to-maturity - fair value $1,608,074 and $1,446,599 at September 30, 2013 and December 31, 2012, respectively	1,649,520	1,398,403
Trading securities	51,451	115,059
Loans and leases, excluding covered loans	16,566,133	14,818,295
Less: Allowance for loan and lease losses	295,947	277,888
Loans and leases, excluding covered loans, net	16,270,186	14,540,407
Covered loans, net of allowance for loan losses	754,190	986,223
Net loans and leases	17,024,376	15,526,630
Premises and equipment, net	168,600	149,433
Deferred tax asset	196,021	124,461
Goodwill	642,622	642,622
Customer-relationship intangibles, net	42,343	48,139
Affordable housing investments	182,088	154,011
Customers' acceptance liability	1,661	7,859
Other real estate owned ($29,818 and $58,276 covered by FDIC loss share at September 30, 2013 and December 31, 2012, respectively)	48,723	79,303
FDIC indemnification asset	101,124	150,018
Other assets	509,031	601,160
Total assets	29,059,404	28,618,492
Liabilities
Demand deposits	15,205,973	14,264,797
Interest checking deposits	2,247,433	2,459,972
Money market deposits	6,613,298	5,610,844
Savings deposits	436,340	398,824
Time deposits-under $100,000	181,676	203,422
Time deposits-$100,000 and over	552,149	564,496
Total deposits	25,236,869	23,502,355
Short-term borrowings	2,588	1,423,798
Long-term debt	719,326	706,051
Reserve for off-balance sheet credit commitments	25,873	24,837
Acceptances outstanding	1,661	7,859
Other liabilities	445,359	407,162
Total liabilities	26,431,676	26,072,062
Redeemable noncontrolling interest	39,840	41,112
Commitments and contingencies
Shareholders' equity
Preferred stock, par value $1.00 per share; 5,000,000 shares authorized; 175,000 shares issued at September 30, 2013 and December 31, 2012	169,920	169,920
Common stock, par value $1.00 per share; 75,000,000 shares authorized; 54,400,047 and 53,885,886 shares issued at September 30, 2013 and December 31, 2012, respectively	54,400	53,886
Additional paid-in capital	519,760	490,339
Accumulated other comprehensive (loss) income	(10,355)	86,582
Retained earnings	1,879,240	1,738,957
Treasury shares, at cost - 485,081 and 669,454 shares at September 30, 2013 and December 31, 2012, respectively	(25,077)	(34,366)
Total common shareholders' equity	2,417,968	2,335,398
Total shareholders' equity	2,587,888	2,505,318
Total liabilities and shareholders' equity	$ 29,059,404	$ 28,618,492