Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 333,000	$ 374,921
Interest-bearing deposits in other financial institutions	131,680	79,764
Federal funds sold and securities purchased under agreements to resell	13,200	19,000
Investment securities held to maturity, at amortized cost	1,236,140	1,168,230
Investment securities available for sale, at fair value	4,801,766	4,967,414
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	194,501	147,240
Loans held for sale	284,376	124,915
Loans	19,815,286	18,714,343
Allowance for loan losses	(267,780)	(274,264)
Loans, net	19,547,506	18,440,079
Premises and equipment, net	331,427	267,606
Goodwill	971,951	968,844
Mortgage servicing rights, net	57,474	61,341
Other intangible assets, net	16,427	16,458
Trading assets	77,112	32,192
Other assets	1,042,139	1,043,831
Total assets	29,038,699	27,711,835
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits	5,039,336	5,562,466
Interest-bearing deposits	15,253,514	15,445,199
Total deposits	20,292,850	21,007,665
Federal funds purchased and securities sold under agreements to repurchase	509,150	431,438
Other short-term funding	1,402,407	402,978
Long-term funding	3,511,475	2,676,164
Trading liabilities	79,466	33,430
Accrued expenses and other liabilities	213,204	222,914
Total liabilities	26,008,552	24,774,589
Stockholders’ equity
Preferred equity	120,201	121,379
Common stock	1,630	1,642
Surplus	1,453,285	1,458,522
Retained earnings	1,629,915	1,593,239
Accumulated other comprehensive income (loss)	13,453	(32,616)
Treasury stock, at cost	(188,337)	(204,920)
Total common equity	2,909,946	2,815,867
Total stockholders’ equity	3,030,147	2,937,246
Total liabilities and stockholders’ equity	$ 29,038,699	$ 27,711,835
Preferred shares issued (in shares)	123,904	125,114
Preferred shares authorized (par value $1.00 per share) (in shares)	750,000	750,000
Common shares issued (in shares)	163,030,209	164,200,068
Common shares authorized (par value $0.01 per share) (in shares)	250,000,000	250,000,000
Treasury shares of common stock (in shares)	11,993,727	12,960,636