CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 434,087	$ 336,470
Due from banks - interest-bearing	1,424,109	119,981
Federal funds sold and securities purchased under resale agreements	200,000	200,000
Securities available-for-sale - cost $5,304,000 and $5,894,509 at September 30, 2015 and December 31, 2014, respectively
Securities pledged as collateral	16,697	14,654
Held in portfolio	5,292,490	5,868,329
Securities held-to-maturity - fair value $3,598,902 and $3,484,647 at September 30, 2015 and December 31, 2014, respectively
Securities pledged as collateral	515,963	521,262
Held in portfolio	2,990,492	2,905,769
Trading securities	154,706	173,188
Loans and leases, excluding acquired impaired loans	22,536,584	20,337,206
Less: Allowance for loan and lease losses	317,157	310,149
Loans and leases, excluding acquired impaired loans, net	22,219,427	20,027,057
Acquired impaired loans, net of allowance for loan losses	393,879	502,371
Net loans and leases	22,613,306	20,529,428
Premises and equipment, net	210,314	207,700
Deferred tax asset	234,680	233,811
Goodwill	637,918	635,868
Customer-relationship intangibles, net	30,987	34,831
Affordable housing investments	222,877	186,423
Customers' acceptance liability	1,650	17,664
Other real estate owned ($8,310 and $12,760 covered by FDIC loss share at September 30, 2015 and December 31, 2014, respectively)	13,894	23,496
FDIC indemnification asset	28,164	50,511
Other assets	553,390	537,847
Total assets	35,575,724	32,597,232
Liabilities
Demand deposits	20,796,610	18,030,021
Interest checking deposits	2,625,541	2,736,391
Money market deposits	6,682,601	6,198,798
Savings deposits	496,510	469,931
Time deposits-under $250,000	262,905	292,613
Time deposits-$250,000 and over	309,195	380,349
Total deposits	31,173,362	28,108,103
Short-term borrowings	6,490	322,861
Long-term debt	650,078	638,600
Reserve for off-balance sheet credit commitments	29,972	27,811
Acceptances outstanding	1,650	17,664
Other liabilities	570,004	499,514
Total liabilities	32,431,556	29,614,553
Redeemable noncontrolling interest	$ 32,847	$ 39,978
Commitments and contingencies
Shareholders' Equity
Preferred stock, par value $1.00 per share; 5,000,000 shares authorized; 275,000 shares issued at September 30, 2015 and December 31, 2014	$ 267,616	$ 267,616
Common stock, par value $1.00 per share; 75,000,000 shares authorized; 55,695,762 and 55,162,455 shares issued at September 30, 2015 and December 31, 2014, respectively	55,696	55,162
Additional paid-in capital	621,716	578,046
Accumulated other comprehensive income (loss)	2,500	(7,074)
Retained earnings	2,182,259	2,071,230
Treasury shares, at cost - 304,920 and 377,224 shares at September 30, 2015 and December 31, 2014, respectively	(18,466)	(22,279)
Total common shareholders' equity	2,843,705	2,675,085
Total shareholders' equity	3,111,321	2,942,701
Total liabilities and shareholders' equity	$ 35,575,724	$ 32,597,232