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Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 4,646,749	$ 4,400,232
Percent	100.00%	100.00%
Taxable [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 79,874	$ 33,793
Percent	1.72%	0.77%
Tax-exempt [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 45,485	$ 47,283
Percent	0.98%	1.07%
Commercial and Financial [Member] | Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 943,881	$ 828,260
Percent	20.31%	18.82%
Commercial and Financial [Member] | Oil & Gas Production And Equipment [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 105,492	$ 84,228
Percent	2.27%	1.91%
Commercial and Financial [Member] | Agriculture [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 135,695	$ 144,751
Percent	2.92%	3.29%
Real Estate [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 425,023	$ 420,884
Percent	9.15%	9.57%
Real Estate [Member] | Farmland [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 197,995	$ 197,872
Percent	4.26%	4.50%
Real Estate [Member] | One to Four Family Residences [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 868,332	$ 846,360
Percent	18.69%	19.24%
Real Estate [Member] | Multifamily Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 47,142	$ 57,806
Percent	1.01%	1.31%
Real Estate [Member] | Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 1,474,344	$ 1,426,643
Percent	31.73%	32.42%
Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 284,864	$ 279,704
Percent	6.13%	6.36%
Other (Not Classified Above) [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 38,622	$ 32,648
Percent	0.83%	0.74%

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Percentage of loans outstanding by category.

+ References

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- 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=82891408&loc=d3e4428-111522

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