Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
ASSETS
Cash and due from banks	$ 505,228	$ 244,223	$ 201,359
Interest-bearing deposits in banks	742,039	13,791	37,058
Total cash and cash equivalents	1,247,267	258,014	238,417
Investment securities:
Held-to-maturity	2,749,934	622,121	620,631
Available-for-sale	3,256,259	2,920,971	2,911,993
Other investments	270,369	140,717	140,730
Loans held for sale	17,813	23,683	17,540
Loans	14,269,166	9,750,784	9,491,349
Allowance for loan losses	(143,835)	(142,197)	(142,586)
Net loans	14,125,331	9,608,587	9,348,763
Premises and equipment, net	324,337	181,149	182,043
Goodwill	734,883	460,044	460,044
Intangible assets	85,447	6,373	6,817
Covered other real estate	70,791	59,855	56,795
Accrued interest receivable and other assets	1,252,555	631,498	645,070
Total assets	24,134,986	14,913,012	14,628,843
Deposits:
Noninterest-bearing	5,461,674	3,338,371	3,231,500
Interest-bearing	2,815,681	1,287,674	1,079,913
Savings and money market accounts	8,575,292	5,758,123	5,744,103
Certificates and other time deposits	2,636,886	1,375,257	1,476,910
Total deposits	19,489,533	11,759,425	11,532,426
Federal funds purchased and securities sold under agreements to repurchase	1,049,801	1,104,525	963,455
Wholesale borrowings	200,858	136,883	178,083
Long-term debt	324,425	0	0
Accrued taxes, expenses and other liabilities	415,724	266,977	330,175
Total liabilities	21,480,341	13,267,810	13,004,139
Shareholders' equity:
Preferred Stock, Value, Issued	100,000	0	0
Common Stock warrant	3,000	0	0
Common Stock, without par value; authorized 300,000,000 shares; issued: September 30, 2013 - 170,179,305 shares; December 31, 2012 and September 30, 2012 - 115,121,731 shares	127,937	127,937	127,937
Capital surplus	1,388,638	475,979	473,781
Accumulated other comprehensive loss	(83,613)	(16,205)	(13,900)
Retained earnings	1,248,554	1,195,850	1,175,001
Treasury stock, at cost: September 30, 2013 - 5,134,681 shares; December 31, 2012 - 5,472,915 shares; September 30, 2012 - 5,468,853 shares	(129,871)	(138,359)	(138,115)
Total shareholders' equity	2,654,645	1,645,202	1,624,704
Total liabilities and shareholders' equity	$ 24,134,986	$ 14,913,012	$ 14,628,843