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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
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%

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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