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Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans held for sale (included above) | $ 12,044 | $ 13,661 | $ 16,612
Total loans | 3,245,084 | 3,242,427 | 3,065,439
Percent | 100.00% | 100.00% | 100.00%
Taxable [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 9,202 | 9,412 | 6,520
Percent | 0.28% | 0.29% | 0.21%
Tax-exempt [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 12,392 | 13,194 | 13,853
Percent | 0.38% | 0.41% | 0.45%
Commercial and Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 529,253 | 559,274 | 515,456
Percent | 16.31% | 17.25% | 16.82%
Oil & gas production & equipment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 145,735 | 154,380 | 125,228
Percent | 4.49% | 4.76% | 4.08%
Agriculture [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 94,337 | 93,274 | 77,882
Percent | 2.91% | 2.88% | 2.54%
Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 247,827 | 226,102 | 197,168
Percent | 7.64% | 6.97% | 6.43%
Farmland [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 126,233 | 125,033 | 111,472
Percent | 3.89% | 3.86% | 3.64%
One to four family residences [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 697,927 | 669,230 | 674,577
Percent | 21.51% | 20.64% | 22.01%
Multifamily residential properties [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 48,128 | 50,721 | 46,866
Percent | 1.48% | 1.56% | 1.53%
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,070,807 | 1,068,445 | 1,036,322
Percent | 33.00% | 32.95% | 33.81%
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 243,799 | 253,002 | 239,156
Percent | 7.51% | 7.80% | 7.80%
Other (not classified above) [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | $ 19,444 | $ 20,360 | $ 20,939
Percent | 0.60% | 0.63% | 0.68%

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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=28367877&loc=d3e4428-111522 + Details
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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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