Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 148,851	$ 223,532
Interest bearing deposits	566,241	315,053
Temporary investments	3,096	5,202
Total cash and cash equivalents	718,188	543,787
Investment securities
Trading, at fair value	3,183	3,747
Available for sale, at fair value	2,396,617	2,625,229
Held to maturity, at amortized cost	4,189	4,541
Loans held for sale, at fair value	133,100	320,132
Non-covered loans and leases	6,663,186	6,681,080
Allowance for non-covered loan and lease losses	(84,692)	(85,391)
Net non-covered loans and leases	6,578,494	6,595,689
Covered loans and leases, net of allowance of $18,221 and $18,275	449,860	477,078
Restricted equity securities	32,783	33,443
Premises and equipment, net	161,911	162,667
Goodwill and other intangible assets, net	684,125	685,331
Mortgage servicing rights, at fair value	32,097	27,428
Non-covered other real estate owned	18,673	17,138
Covered other real estate owned	7,896	10,374
FDIC indemnification asset	46,046	52,798
Other assets	224,248	236,061
Total assets	11,491,410	11,795,443
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest bearing	2,175,140	2,278,914
Interest bearing	6,896,515	7,100,361
Total deposits	9,071,655	9,379,275
Securities sold under agreements to repurchase	142,810	137,075
Term debt	253,080	253,605
Junior subordinated debentures, at fair value	85,616	85,081
Junior subordinated debentures, at amortized cost	102,141	110,985
Other liabilities	101,845	105,383
Total liabilities	9,757,147	10,071,404
COMMITMENTS AND CONTINGENCIES (NOTE 10)
SHAREHOLDERS' EQUITY
Common stock, no par value, 200,000,000 shares authorized; issued and outstanding: 111,960,580 in 2013 and 111,889,959 in 2012	1,513,197	1,512,400
Retained earnings	199,362	187,293
Accumulated other comprehensive income	21,704	24,346
Total shareholders' equity	1,734,263	1,724,039
Total liabilities and shareholders' equity	$ 11,491,410	$ 11,795,443