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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 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. + Details
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Balance Type: | debit
Period Type: | instant

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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. + Details
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