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Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans held for sale (included above)	$ 4,934	$ 11,257	$ 13,384
Total loans	3,358,938	3,242,427	3,116,096
Percent	100.00%	100.00%	100.00%
Taxable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	10,248	9,412	7,786
Percent	0.31%	0.29%	0.25%
Tax-exempt [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	12,232	13,194	13,749
Percent	0.36%	0.41%	0.44%
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	566,670	559,274	541,130
Percent	16.87%	17.25%	17.37%
Oil & gas production & equipment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	139,605	154,380	131,642
Percent	4.16%	4.76%	4.22%
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	89,258	93,274	83,146
Percent	2.66%	2.88%	2.67%
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	283,468	226,102	211,505
Percent	8.44%	6.97%	6.79%
Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	133,397	125,033	114,043
Percent	3.97%	3.86%	3.66%
One to four family residences [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	696,651	669,230	674,457
Percent	20.74%	20.64%	21.64%
Multifamily residential properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	57,825	50,721	50,659
Percent	1.72%	1.56%	1.63%
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,100,544	1,068,445	1,026,097
Percent	32.76%	32.95%	32.93%
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	248,025	253,002	241,864
Percent	7.38%	7.80%	7.76%
Other (not classified above) [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 21,015	$ 20,360	$ 20,018
Percent	0.63%	0.63%	0.64%

X

- Definition

Loans Percent

+ References

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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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