CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 79,669	$ 87,274
Interest-earning balances due from Federal Reserve	55,609	11,157
Total cash and cash equivalents	135,278	98,431
Interest-earning balances due from depository institutions	70,000	70,000
Investment securities available-for-sale, at fair value (with amortized cost of $2,329,892 at March 31, 2013, and $2,374,816 at December 31, 2012)	2,390,673	2,449,387
Investment securities held-to-maturity	1,975	2,050
Investment in stock of Federal Home Loan Bank (FHLB)	50,981	56,651
Loans and lease finance receivables, excluding covered loans	3,189,514	3,252,313
Allowance for loan losses	(92,218)	(92,441)
Net loans and lease finance receivables	3,097,296	3,159,872
Covered loans and lease finance receivables, net	178,694	195,215
Premises and equipment, net	34,886	35,080
Bank owned life insurance	120,476	119,744
Accrued interest receivable	22,985	22,355
Intangibles	2,950	3,389
Goodwill	55,097	55,097
FDIC loss sharing asset	14,230	18,489
Non-covered other real estate owned	13,341	14,832
Covered other real estate owned	857	1,067
Income taxes	35,077	16,978
Other assets	40,971	44,727
TOTAL ASSETS	6,265,767	6,363,364
Deposits:
Noninterest-bearing	2,366,719	2,420,993
Interest-bearing	2,319,442	2,352,994
Total deposits	4,686,161	4,773,987
Customer repurchase agreements	500,115	473,244
FHLB advances	199,002	198,934
Other borrowings		26,000
Accrued interest payable	1,306	1,493
Deferred compensation	9,259	8,781
Junior subordinated debentures	46,393	67,012
Other liabilities	55,319	50,943
TOTAL LIABILITIES	5,497,555	5,600,394
COMMITMENTS AND CONTINGENCIES
Stockholders' Equity:
Common stock, authorized, 225,000,000 shares without par; issued and outstanding 104,903,107 at March 31, 2013, and 104,889,586 at December 31, 2012.	485,246	484,709
Retained earnings	247,713	235,010
Accumulated other comprehensive income, net of tax	35,253	43,251
Total stockholders' equity	768,212	762,970
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 6,265,767	$ 6,363,364