Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks		$ 287,183	$ 374,921
Interest-bearing deposits in other financial institutions		68,025	79,764
Federal funds sold and securities purchased under agreements to resell		20,200	19,000
Investment securities held to maturity, at amortized cost		1,176,821	1,168,230
Investment securities available for sale, at fair value		4,905,841	4,967,414
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost		181,853	147,240
Loans held for sale		128,339	124,915
Loans		19,227,240	18,714,343
Allowance for loan losses		(277,370)	(274,264)
Loans, net		18,949,870	18,440,079
Premises and equipment, net		331,711	267,606
Goodwill		971,951	968,844
Mortgage servicing rights		59,414	61,341
Other intangible assets		16,966	16,458
Trading assets		53,087	32,192
Other assets	[1]	1,027,606	1,043,831
Total assets		28,178,867	27,711,835
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits		5,272,685	5,562,466
Interest-bearing deposits		15,412,775	15,445,199
Total deposits		20,685,460	21,007,665
Federal funds purchased and securities sold under agreements to repurchase		583,247	431,438
Other short-term funding		834,161	402,978
Long-term funding	[1]	2,861,316	2,676,164
Trading liabilities		55,223	33,430
Accrued expenses and other liabilities		176,962	222,914
Total liabilities		25,196,369	24,774,589
Stockholders’ equity
Preferred equity		120,347	121,379
Common stock		1,630	1,642
Surplus		1,447,368	1,458,522
Retained earnings		1,599,835	1,593,239
Accumulated other comprehensive loss		2,167	(32,616)
Treasury stock, at cost		(188,849)	(204,920)
Total common equity		2,862,151	2,815,867
Total stockholders’ equity		2,982,498	2,937,246
Total liabilities and stockholders’ equity		$ 28,178,867	$ 27,711,835
Preferred shares issued (in shares)		124,054	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)		12,036,645	12,960,636

[1] During the first quarter of 2016, the Corporation adopted a new accounting standard related to simplifying the presentation of debt issuance costs. Under this new accounting standard, debt issuance costs are still capitalized; however, they are reflected on the balance sheet with the related debt issued rather than within other assets. All prior periods have been restated to reflect this change in presentation. See Note 3 for additional information on this new accounting standard.