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Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 3,858,332	$ 3,851,398
Percent	100.00%	100.00%
Taxable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 17,884	$ 20,431
Percent	0.46%	0.53%
Tax-exempt [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 27,687	$ 20,952
Percent	0.72%	0.54%
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 741,595	$ 745,106
Percent	19.22%	19.35%
Oil & Gas Production And Equipment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 88,488	$ 104,940
Percent	2.29%	2.72%
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 117,729	$ 132,830
Percent	3.05%	3.45%
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 363,067	$ 356,621
Percent	9.41%	9.26%
Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 148,500	$ 149,507
Percent	3.85%	3.88%
One to Four Family Residences [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 785,170	$ 766,362
Percent	20.35%	19.90%
Multifamily Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 64,366	$ 66,766
Percent	1.67%	1.73%
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 1,200,331	$ 1,191,477
Percent	31.11%	30.94%
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 270,172	$ 267,179
Percent	7.00%	6.94%
Other (Not Classified Above) [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 33,343	$ 29,227
Percent	0.87%	0.76%

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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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