Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and due from banks (noninterest-bearing)	$ 242,896	$ 231,489
Federal funds sold and securities purchased under reverse repurchase agreements	5,926	7,046
Securities available for sale (at fair value)	3,546,083	2,657,745
Securities held to maturity (fair value: $78,096-2013; $46,888-2012)	73,666	42,188
Loans held for sale (LHFS)	207,758	257,986
Loans held for investment (LHFI)	5,474,396	5,592,754
Less allowance for loan losses, LHFI	76,900	78,738
Net LHFI	5,397,496	5,514,016
Acquired loans:
Noncovered loans	1,003,127	81,523
Covered loans	47,589	52,041
Less allowance for loan losses, acquired loans	6,458	6,075
Net acquired loans	1,044,258	127,489
Net LHFI and acquired loans	6,441,754	5,641,505
Premises and equipment, net	210,789	154,841
Mortgage servicing rights	51,529	47,341
Goodwill	366,366	291,104
Identifiable intangible assets	49,361	17,306
Other real estate, excluding covered other real estate	118,406	78,189
Covered other real estate	5,879	5,741
FDIC indemnification asset	20,198	21,774
Other assets	509,904	374,412
Total Assets	11,850,515	9,828,667
Deposits:
Noninterest-bearing	2,534,287	2,254,211
Interest-bearing	7,375,144	5,642,306
Total deposits	9,909,431	7,896,517
Federal funds purchased and securities sold under repurchase agreements	219,769	288,829
Short-term borrowings	46,325	86,920
Long-term FHLB advances	10,969	0
Subordinated notes	49,879	49,871
Junior subordinated debt securities	94,856	61,856
Other liabilities	166,340	157,305
Total Liabilities	10,497,569	8,541,298
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 67,151,087 shares - 2013; 64,820,414 shares - 2012	13,992	13,506
Capital surplus	342,233	285,905
Retained earnings	991,012	984,563
Accumulated other comprehensive income, net of tax	5,709	3,395
Total Shareholders' Equity	1,352,946	1,287,369
Total Liabilities and Shareholders' Equity	$ 11,850,515	$ 9,828,667