Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Assets
Cash and due from banks		$ 354,331	$ 446,558
Interest-bearing deposits in other financial institutions		109,596	149,175
Federal funds sold and securities purchased under agreements to resell		27,700	46,500
Investment securities held to maturity, at amortized cost		2,233,579	1,273,536
Investment securities available for sale, at fair value		3,801,699	4,680,226
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost		172,446	140,001
Residential loans held for sale	[1]	113,064	108,010
Commercial loans held for sale		9,718	12,474
Loans		20,931,460	20,054,716
Allowance for loan losses		(276,551)	(278,335)
Loans, net		20,654,909	19,776,381
Premises and equipment, net		330,065	330,315
Bank and corporate owned life insurance		589,093	585,290
Goodwill		972,006	971,951
Mortgage servicing rights, net		58,377	61,476
Other intangible assets, net		14,080	15,377
Trading assets		48,429	52,398
Other assets		575,455	489,647
Total assets		30,064,547	29,139,315
Liabilities and Stockholders’ Equity
Noninterest-bearing demand deposits		5,177,734	5,392,208
Interest-bearing deposits		17,155,717	16,496,240
Total deposits		22,333,451	21,888,448
Federal funds purchased and securities sold under agreements to repurchase		476,550	508,347
Other short-term funding		588,067	583,688
Long-term funding		3,147,285	2,761,795
Trading liabilities		46,812	51,103
Accrued expenses and other liabilities		268,781	254,622
Total liabilities		26,860,946	26,048,003
Stockholders’ Equity
Preferred equity		159,929	159,929
Common stock		1,615	1,630
Surplus		1,442,328	1,459,498
Retained earnings		1,792,184	1,695,764
Accumulated other comprehensive income (loss)		(54,288)	(54,679)
Treasury stock, at cost		(138,167)	(170,830)
Total common equity		3,043,672	2,931,383
Total stockholders’ equity		3,203,601	3,091,312
Total liabilities and stockholders’ equity		$ 30,064,547	$ 29,139,315
Preferred shares issued (in shares)		165,000	165,000
Preferred shares authorized (par value $1.00 per share) (in shares)		750,000	750,000
Common shares issued (in shares)		161,460,708	163,030,209
Common shares authorized (par value $0.01 per share) (in shares)		250,000,000	250,000,000
Treasury shares of common stock (in shares)		9,143,102	10,909,362

[1] (1)Effective January 1, 2017, residential loans originated for sale are accounted for under the fair value option. Prior periods have not been restated. For more information on this accounting policy change, please refer to Note 3 to Notes to the Consolidated Financial Statements.