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Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans held for sale (included above)	$ 6,469	$ 11,257
Total loans	3,387,146	3,242,427
Percent	100.00%	100.00%
Taxable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	10,217	9,412
Percent	0.30%	0.29%
Tax-exempt [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,073	13,194
Percent	0.33%	0.41%
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	605,672	559,274
Percent	17.88%	17.25%
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	111,323	93,274
Percent	3.29%	2.88%
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	284,808	226,102
Percent	8.41%	6.97%
Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	132,512	125,033
Percent	3.91%	3.86%
One to four family residences [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	703,903	669,230
Percent	20.78%	20.64%
Multifamily residential properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	60,080	50,721
Percent	1.77%	1.56%
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,097,484	1,068,445
Percent	32.40%	32.95%
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	250,588	253,002
Percent	7.40%	7.80%
Other (not classified above) [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	22,579	20,360
Percent	0.67%	0.63%
Oil & gas production & equipment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 96,907	$ 154,380
Percent	2.86%	4.76%

X

- Definition

Loans Percent

+ References

No definition available.

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- 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=28367877&loc=d3e4428-111522

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X

- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

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