Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Carrying amount and fair value of the Company's financial instruments
Available-for-sale securities	$ 517,161	$ 482,430
Loans held for investment, net of unearned income:
Covered under loss share agreements	221,977
Not covered under loss share agreements	1,541,633	1,396,067
FDIC receivable under loss share agreements	49,477
Accrued interest receivable	6,038	6,193
Level 1 [Member]
Carrying amount and fair value of the Company's financial instruments
Cash and cash equivalents	165,229
Available-for-sale securities	5,642
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	3,536
Securities sold under agreements to repurchase
Accrued interest payable
FHLB and other indebtedness
Derivative financial liabilities
Deferred compensation liabilities	3,536
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	511,519
Held-to-maturity securities	825
Loans held for sale	4,540
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	6,038
Derivative financial assets	301
Deferred Compensation Assets
Securities sold under agreements to repurchase	155,062
Accrued interest payable	2,548
FHLB and other indebtedness	202,739
Derivative financial liabilities	2
Deferred compensation liabilities
Level 2 [Member] \| Demand deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	335,100
Level 2 [Member] \| Interest-bearing demand deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	360,053
Level 2 [Member] \| Savings deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	496,749
Level 2 [Member] \| Time deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	882,943
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	221,977
Not covered under loss share agreements	1,551,116
FDIC receivable under loss share agreements	49,477
Accrued interest receivable
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	165,229	47,294
Investment securities		485,920
Available-for-sale securities	517,161
Held-to-maturity securities	816
Loans held for sale	4,446	5,820
Loans held for investment less allowance		1,369,862
Loans held for investment, net of unearned income:
Covered under loss share agreements	221,977
Not covered under loss share agreements	1,541,633
FDIC receivable under loss share agreements	49,477
Accrued interest receivable	6,038	6,193
Derivative financial assets	301	135
Deferred Compensation Assets	3,536	3,210
Securities sold under agreements to repurchase	146,904	129,208
Accrued interest payable	2,548	2,554
FHLB and other indebtedness	177,435	165,933
Derivative financial liabilities	2	6
Deferred compensation liabilities	3,536	3,210
Carrying Amount [Member] \| Demand deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	335,100	240,268
Carrying Amount [Member] \| Interest-bearing demand deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	360,053	275,156
Carrying Amount [Member] \| Savings deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	496,749	394,707
Carrying Amount [Member] \| Time deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	872,058	633,336
Fair Value [Member]
Carrying amount and fair value of the Company's financial instruments
Cash and cash equivalents	165,229	47,294
Investment securities		485,962
Available-for-sale securities	517,161
Held-to-maturity securities	825
Loans held for sale	4,540	5,877
Loans held for investment less allowance		1,386,419
Loans held for investment, net of unearned income:
Covered under loss share agreements	221,977
Not covered under loss share agreements	1,551,116
FDIC receivable under loss share agreements	49,477
Accrued interest receivable	6,038	6,193
Derivative financial assets	301	135
Deferred Compensation Assets	3,536	3,210
Securities sold under agreements to repurchase	155,062	136,359
Accrued interest payable	2,548	2,554
FHLB and other indebtedness	202,739	183,722
Derivative financial liabilities	2	6
Deferred compensation liabilities	3,536	3,210
Fair Value [Member] \| Demand deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	335,100	240,268
Fair Value [Member] \| Interest-bearing demand deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	360,053	275,156
Fair Value [Member] \| Savings deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	496,749	394,707
Fair Value [Member] \| Time deposits [Member]
Loans held for investment, net of unearned income:
Deposits Fair Value	$ 882,943	$ 641,604

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Loans held for investment less allowance.

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No definition available.

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

+ Details

Name:	us-gaap_TradingSecuritiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant