Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Assets
Cash and due from banks	$ 628,092		$ 976,191		$ 1,098,721
Funds sold and resell agreements	11,171		10,174		12,040
Trading securities	149,317		76,800		99,846
Investment securities	412,479		439,236		349,583
Available for sale securities	10,395,415		10,179,365		9,567,008
Fair value option securities	325,177		651,226		553,231
Residential mortgage loans held for sale	259,174		188,125		169,609
Loans	11,576,431		11,269,743		10,737,544
Less allowance for loan losses	(231,669)		(253,481)		(286,611)
Loans, net of allowance	11,344,762		11,016,262		10,450,933
Premises and equipment, net	261,508		262,735		265,057
Receivables	121,944		123,257		129,944
Goodwill	335,601		335,601		335,601
Intangible assets, net	9,098		10,219		12,010
Mortgage servicing rights, net	91,783	[1]	86,783		109,192
Real estate and other repossessed assets	105,708		122,753		129,026
Bankers' acceptances	2,873		1,881		1,661
Derivative contracts	366,204	[2],[3]	293,859	[2],[3]	229,887	[2],[3]
Cash surrender value of bank-owned life insurance	269,093		263,318		261,203
Receivable on unsettled securities trades	32,876		75,151		170,600
Other assets	453,771		381,010		293,030
Total assets	25,576,046		25,493,946		24,238,182
Noninterest-bearing demand deposits	6,440,375		5,799,785		4,725,977
Interest-bearing deposits:
Transaction	8,551,874		9,354,456		9,013,323
Savings	261,998		226,357		211,877
Time	3,107,950		3,381,982		3,634,700
Total deposits	18,362,197		18,762,580		17,585,877
Funds purchased	1,453,750		1,063,318		1,706,893
Repurchase agreements	1,136,948		1,233,064		1,106,163
Other borrowings	58,056		74,485		149,703
Subordinated debentures	353,378		398,881		398,788
Accrued interest, taxes and expense	140,434		149,508		104,493
Bankers' acceptances	2,873		1,881		1,661
Derivative contracts	370,053	[2],[3]	236,522	[2],[3]	173,917	[2],[3]
Due on unsettled securities trades	603,800		653,371		166,607
Other liabilities	171,836		133,684		151,906
Total liabilities	22,653,325		22,707,294		21,546,008
Shareholders' equity:
Common stock	4		4		4
Capital surplus	836,065		818,817		794,292
Retained earnings	2,086,565		1,953,332		1,842,022
Treasury stock	(175,890)		(150,664)		(114,856)
Accumulated other comprehensive income	139,190		128,979		146,255
Total shareholders' equity	2,885,934		2,750,468		2,667,717
Non-controlling interest	36,787		36,184		24,457
Total equity	2,922,721		2,786,652		2,692,174
Total liabilities and equity	$ 25,576,046		$ 25,493,946		$ 24,238,182

[1] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 5, Mortgage Banking Activities.

[2] Derivative contracts are recorded on a net basis in the balance sheet in recognition of master netting agreements that enable the Company to settle all derivative positions with a given counterparty in total and to offset the net derivative position with the related cash collateral.

[3] See Note 3 for detail of fair value of derivative contracts by contract type.