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Loans and Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Summary of loans outstanding by category
Total loans	$ 3,116,096	$ 3,013,498	$ 2,984,114
Percent	100.00%	100.00%	100.00%
Loans held for sale (included above)	15,479	12,126	13,066
Commercial and Industrial [Member]
Summary of loans outstanding by category
Total loans	541,130	547,942	542,189
Percent	17.37%	18.19%	18.17%
Oil & gas production & equipment [Member]
Summary of loans outstanding by category
Total loans	131,642	115,786	109,272
Percent	4.22%	3.84%	3.66%
Agriculture [Member]
Summary of loans outstanding by category
Total loans	83,146	86,297	73,021
Percent	2.67%	2.86%	2.45%
Construction [Member]
Summary of loans outstanding by category
Total loans	211,505	207,953	258,182
Percent	6.79%	6.90%	8.65%
Farmland [Member]
Summary of loans outstanding by category
Total loans	114,043	103,923	97,041
Percent	3.66%	3.45%	3.25%
One to four family residences [Member]
Summary of loans outstanding by category
Total loans	674,457	655,134	655,007
Percent	21.64%	21.74%	21.95%
Multifamily residential properties [Member]
Summary of loans outstanding by category
Total loans	50,659	37,734	37,173
Percent	1.63%	1.25%	1.24%
Taxable [Member]
Summary of loans outstanding by category
Total loans	7,786	6,939	7,079
Percent	0.25%	0.23%	0.24%
Tax-exempt [Member]
Summary of loans outstanding by category
Total loans	13,749	17,070	12,192
Percent	0.44%	0.57%	0.41%
Commercial [Member]
Summary of loans outstanding by category
Total loans	1,026,097	960,074	908,207
Percent	32.93%	31.86%	30.43%
Consumer [Member]
Summary of loans outstanding by category
Total loans	241,864	252,331	260,718
Percent	7.76%	8.37%	8.74%
Other (not classified above) [Member]
Summary of loans outstanding by category
Total loans	$ 20,018	$ 22,315	$ 24,033
Percent	0.64%	0.74%	0.81%

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- Definition

Loans percent.

+ References

No definition available.

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X

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

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 loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date.

+ References

No definition available.

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