Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Carrying amount and fair value of the Company's financial instruments
Available-for-sale securities	$ 526,607	$ 482,430
Loans held for investment, net of unearned income
Covered under loss share agreements	238,777
Not covered under loss share agreements	1,568,312	1,396,067
FDIC receivable under loss share agreements	52,067
Level 1 [Member]
Carrying amount and fair value of the Company's financial instruments
Cash and cash equivalents	156,165
Available-for-sale securities	525
Held-to-maturity securities
Loans held for sale
Loans held for investment, net of unearned income
Covered under loss share agreements
Not covered under loss share agreements
FDIC receivable under loss share agreements
Accrued interest receivable
Derivative financial assets
Deferred Compensation Assets	3,467
Securities sold under agreements to repurchase
Accrued interest payable
FHLB and other indebtedness
Derivative financial liabilities
Deferred compensation liabilities	3,467
Level 1 [Member] \| Demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value
Level 1 [Member] \| Interest-bearing demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value
Level 1 [Member] \| Savings deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value
Level 1 [Member] \| Time deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value
Level 2 [Member]
Carrying amount and fair value of the Company's financial instruments
Cash and cash equivalents
Available-for-sale securities	526,082
Held-to-maturity securities	1,318
Loans held for sale	1,204
Loans held for investment, net of unearned income
Covered under loss share agreements
Not covered under loss share agreements
FDIC receivable under loss share agreements
Accrued interest receivable	8,396
Derivative financial assets	206
Deferred Compensation Assets
Securities sold under agreements to repurchase	156,643
Accrued interest payable	2,708
FHLB and other indebtedness	212,190
Derivative financial liabilities	2
Deferred compensation liabilities
Level 2 [Member] \| Demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	340,895
Level 2 [Member] \| Interest-bearing demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	335,686
Level 2 [Member] \| Savings deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	494,516
Level 2 [Member] \| Time deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	961,682
Level 3 [Member]
Carrying amount and fair value of the Company's financial instruments
Cash and cash equivalents
Available-for-sale securities
Held-to-maturity securities
Loans held for sale
Loans held for investment, net of unearned income
Covered under loss share agreements	238,777
Not covered under loss share agreements	1,566,485
FDIC receivable under loss share agreements	52,067
Accrued interest receivable	0
Derivative financial assets
Deferred Compensation Assets
Securities sold under agreements to repurchase
Accrued interest payable
FHLB and other indebtedness
Derivative financial liabilities
Deferred compensation liabilities
Level 3 [Member] \| Demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value
Level 3 [Member] \| Interest-bearing demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value
Level 3 [Member] \| Savings deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value
Level 3 [Member] \| Time deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value
Carrying Amount [Member]
Carrying amount and fair value of the Company's financial instruments
Cash and cash equivalents	156,165	47,294
Investment securities		485,920
Available-for-sale securities	526,607
Held-to-maturity securities	1,295
Loans held for sale	1,179	5,820
Loans held for investment less allowance		1,369,862
Loans held for investment, net of unearned income
Covered under loss share agreements	238,777
Not covered under loss share agreements	1,542,141
FDIC receivable under loss share agreements	52,067
Accrued interest receivable	8,396	6,193
Derivative financial assets	206	135
Deferred Compensation Assets	3,467	3,210
Securities sold under agreements to repurchase	148,367	129,208
Accrued interest payable	2,708	2,554
FHLB and other indebtedness	192,571	165,933
Derivative financial liabilities	2	6
Deferred compensation liabilities	3,467	3,210
Carrying Amount [Member] \| Demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	340,895	240,268
Carrying Amount [Member] \| Interest-bearing demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	335,686	275,156
Carrying Amount [Member] \| Savings deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	494,516	394,707
Carrying Amount [Member] \| Time deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	934,110	633,336
Fair Value [Member]
Carrying amount and fair value of the Company's financial instruments
Cash and cash equivalents	156,165	47,294
Investment securities		485,962
Available-for-sale securities	526,607
Held-to-maturity securities	1,318
Loans held for sale	1,204	5,877
Loans held for investment less allowance		1,386,419
Loans held for investment, net of unearned income
Covered under loss share agreements	238,777
Not covered under loss share agreements	1,566,485
FDIC receivable under loss share agreements	52,067
Accrued interest receivable	8,396	6,193
Derivative financial assets	206	135
Deferred Compensation Assets	3,467	3,210
Securities sold under agreements to repurchase	156,643	136,359
Accrued interest payable	2,708	2,554
FHLB and other indebtedness	212,190	183,722
Derivative financial liabilities	2	6
Deferred compensation liabilities	3,467	3,210
Fair Value [Member] \| Demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	340,895	240,268
Fair Value [Member] \| Interest-bearing demand deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	335,686	275,156
Fair Value [Member] \| Savings deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	494,516	394,707
Fair Value [Member] \| Time deposits [Member]
Loans held for investment, net of unearned income
Deposits Fair Value	$ 961,682	$ 641,604

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Deferred compensation liabilities fair value.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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