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Loans and Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of loans outstanding by category
Total loans	$ 3,242,427	$ 3,013,498
Percent	100.00%	100.00%
Loans held for sale (included above)	13,661	12,126
Commercial and Industrial [Member]
Summary of loans outstanding by category
Total loans	559,274	547,942
Percent	17.25%	18.19%
Oil & gas production & equipment [Member]
Summary of loans outstanding by category
Total loans	154,380	115,786
Percent	4.76%	3.84%
Agriculture [Member]
Summary of loans outstanding by category
Total loans	93,274	86,297
Percent	2.88%	2.86%
Construction [Member]
Summary of loans outstanding by category
Total loans	226,102	207,953
Percent	6.97%	6.90%
Farmland [Member]
Summary of loans outstanding by category
Total loans	125,033	103,923
Percent	3.86%	3.45%
One to four family residences [Member]
Summary of loans outstanding by category
Total loans	669,230	655,134
Percent	20.64%	21.74%
Multifamily residential properties [Member]
Summary of loans outstanding by category
Total loans	50,721	37,734
Percent	1.56%	1.25%
Taxable [Member]
Summary of loans outstanding by category
Total loans	9,412	6,939
Percent	0.29%	0.23%
Tax-exempt [Member]
Summary of loans outstanding by category
Total loans	13,194	17,070
Percent	0.41%	0.57%
Commercial [Member]
Summary of loans outstanding by category
Total loans	1,068,445	960,074
Percent	32.95%	31.86%
Consumer [Member]
Summary of loans outstanding by category
Total loans	253,002	252,331
Percent	7.80%	8.37%
Other (not classified above) [Member]
Summary of loans outstanding by category
Total loans	$ 20,360	$ 22,315
Percent	0.63%	0.74%

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- Definition

Loans percent.

+ References

No definition available.

+ Details

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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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