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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, 2014	Dec. 31, 2013	Jun. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans held for sale (included above)	$ 9,519	$ 6,469	$ 10,367
Total loans	3,665,908	3,387,146	3,245,084
Percent	100.00%	100.00%	100.00%
Taxable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	9,346	10,217	9,202
Percent	0.25%	0.30%	0.28%
Tax-exempt [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	10,803	11,073	12,392
Percent	0.29%	0.33%	0.38%
Commercial and industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	677,425	605,672	529,253
Percent	18.48%	17.88%	16.31%
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	102,693	111,323	94,337
Percent	2.80%	3.29%	2.91%
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	355,526	284,808	247,827
Percent	9.70%	8.41%	7.64%
Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	144,519	132,512	126,233
Percent	3.94%	3.91%	3.89%
One to four family residences [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	748,228	703,903	697,927
Percent	20.41%	20.78%	21.51%
Multifamily residential properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	60,430	60,080	48,128
Percent	1.65%	1.77%	1.48%
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,160,079	1,097,484	1,070,807
Percent	31.65%	32.40%	33.00%
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	258,745	250,588	243,799
Percent	7.06%	7.40%	7.51%
Other (not classified above) [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	27,201	22,579	19,444
Percent	0.74%	0.67%	0.60%
Oil & gas production & equipment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 110,913	$ 96,907	$ 145,735
Percent	3.03%	2.86%	4.49%

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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