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Loans and Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
Schedule of loans outstanding by category |  |  |
Total loans | $ 3,219,967 | $ 3,242,427 | $ 3,049,376
Percent | 100.00% | 100.00% | 100.00%
Loans held for sale (included above) | 10,287 | 13,661 | 15,585
Taxable [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 9,272 | 9,412 | 7,332
Percent | 0.29% | 0.29% | 0.24%
Tax-exempt [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 13,034 | 13,194 | 15,810
Percent | 0.41% | 0.41% | 0.52%
Other (not classified above) [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 19,521 | 20,360 | 21,821
Percent | 0.61% | 0.63% | 0.72%
Commercial and Industrial [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 518,438 | 559,274 | 526,028
Percent | 16.10% | 17.25% | 17.25%
Oil & gas production & equipment [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 154,392 | 154,380 | 129,710
Percent | 4.79% | 4.76% | 4.25%
Agriculture [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 96,094 | 93,274 | 90,659
Percent | 2.98% | 2.88% | 2.97%
Construction [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 231,770 | 226,102 | 200,609
Percent | 7.20% | 6.97% | 6.58%
Farmland [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 124,347 | 125,033 | 107,751
Percent | 3.86% | 3.86% | 3.53%
One to four family residences [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 680,129 | 669,230 | 660,725
Percent | 21.12% | 20.64% | 21.67%
Multifamily residential properties [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 47,506 | 50,721 | 40,164
Percent | 1.48% | 1.56% | 1.32%
Commercial [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | 1,084,864 | 1,068,445 | 1,004,596
Percent | 33.69% | 32.95% | 32.94%
Consumer [Member] |  |  |
Schedule of loans outstanding by category |  |  |
Total loans | $ 240,600 | $ 253,002 | $ 244,171
Percent | 7.47% | 7.80% | 8.01%

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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
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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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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant