Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets
Cash and due from banks (noninterest-bearing)	$ 213,500	$ 202,625
Federal funds sold and securities purchased under reverse repurchase agreements	6,301	9,258
Securities available for sale (at fair value)	2,595,664	2,468,993
Securities held to maturity (fair value: $56,713-2012; $62,515-2011)	52,010	57,705
Loans held for sale (LHFS)	227,449	216,553
Loans held for investment (LHFI)	5,774,753	5,857,484
Less allowance for loan losses, LHFI	90,879	89,518
Net LHFI	5,683,874	5,767,966
Acquired loans:
Noncovered loans	100,669	0
Covered loans	74,419	76,804
Less allowance for loan losses, acquired loans	773	502
Net acquired loans	174,315	76,302
Net LHFI and acquired loans	5,858,189	5,844,268
Premises and equipment, net	156,158	142,582
Mortgage servicing rights	45,893	43,274
Goodwill	291,104	291,104
Identifiable intangible assets	18,821	14,076
Other real estate, excluding covered other real estate	75,742	79,053
Covered other real estate	5,824	6,331
FDIC indemnification asset	28,260	28,348
Other assets	356,678	322,837
Total Assets	9,931,593	9,727,007
Deposits:
Noninterest-bearing	2,024,290	2,033,442
Interest-bearing	6,066,456	5,532,921
Total deposits	8,090,746	7,566,363
Federal funds purchased and securities sold under repurchase agreements	254,878	604,500
Short-term borrowings	82,023	87,628
Subordinated notes	49,847	49,839
Junior subordinated debt securities	61,856	61,856
Other liabilities	150,723	141,784
Total Liabilities	8,690,073	8,511,970
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 64,765,581 shares - 2012; 64,142,498 shares - 2011	13,494	13,364
Capital surplus	282,388	266,026
Retained earnings	944,101	932,526
Accumulated other comprehensive income, net of tax	1,537	3,121
Total Shareholders' Equity	1,241,520	1,215,037
Total Liabilities and Shareholders' Equity	$ 9,931,593	$ 9,727,007