CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 146,338	$ 151,969
Due from banks - interest-bearing	156,221	246,336
Federal funds sold and securities purchased under resale agreements	200,000	17,100
Securities available-for-sale - cost $7,033,250 and $9,057,238 at June 30, 2013 and December 31, 2012, respectively:
Securities pledged as collateral	13,909	48,697
Held in portfolio	7,030,662	9,157,292
Securities held-to-maturity - fair value $1,466,557 and $1,446,599 at June 30, 2013 and December 31, 2012, respectively	1,503,973	1,398,403
Trading securities	48,655	115,059
Loans and leases, excluding covered loans	15,819,252	14,818,295
Less: Allowance for loan and lease losses	289,914	277,888
Loans and leases, excluding covered loans, net	15,529,338	14,540,407
Covered loans, net of allowance for loan losses	843,582	986,223
Net loans and leases	16,372,920	15,526,630
Premises and equipment, net	162,535	149,433
Deferred tax asset	183,464	124,461
Goodwill	642,622	642,622
Customer-relationship intangibles, net	44,275	48,139
Affordable housing investments	166,781	154,011
Customers' acceptance liability	2,742	7,859
Other real estate owned ($41,801 and $58,276 covered by FDIC loss share at June 30, 2013 and December 31, 2012, respectively)	61,477	79,303
FDIC indemnification asset	117,295	150,018
Other assets	525,633	601,160
Total assets	27,379,502	28,618,492
Liabilities
Demand deposits	14,288,001	14,264,797
Interest checking deposits	2,270,298	2,459,972
Money market deposits	5,821,737	5,610,844
Savings deposits	399,223	398,824
Time deposits-under $100,000	224,734	203,422
Time deposits-$100,000 and over	647,764	564,496
Total deposits	23,651,757	23,502,355
Short-term borrowings	2,675	1,423,798
Long-term debt	706,537	706,051
Reserve for off-balance sheet credit commitments	25,124	24,837
Acceptances outstanding	2,742	7,859
Other liabilities	405,956	407,162
Total liabilities	24,794,791	26,072,062
Redeemable noncontrolling interest	39,943	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 June 30, 2013 and December 31, 2012	169,920	169,920
Common stock, par value $1.00 per share; 75,000,000 shares authorized; 54,273,594 and 53,885,886 shares issued at June 30, 2013 and December 31, 2012, respectively	54,274	53,886
Additional paid-in capital	507,560	490,339
Accumulated other comprehensive income	6,585	86,582
Retained earnings	1,831,725	1,738,957
Treasury shares, at cost - 492,294 and 669,454 shares at June 30, 2013 and December 31, 2012, respectively	(25,296)	(34,366)
Total common shareholders' equity	2,374,848	2,335,398
Total shareholders' equity	2,544,768	2,505,318
Total liabilities and shareholders' equity	$ 27,379,502	$ 28,618,492