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Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 5,007,518	$ 4,721,995
Percent	100.00%	100.00%
Taxable [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 65,745	$ 73,827
Percent	1.31%	1.56%
Tax-exempt [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 54,400	$ 48,626
Percent	1.09%	1.03%
Commercial and Financial [Member] | Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 1,083,958	$ 995,207
Percent	21.65%	21.08%
Commercial and Financial [Member] | Oil & Gas Production And Equipment [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 95,777	$ 95,574
Percent	1.91%	2.02%
Commercial and Financial [Member] | Agriculture [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 130,961	$ 141,249
Percent	2.62%	2.99%
Real Estate [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 456,062	$ 437,277
Percent	9.11%	9.26%
Real Estate [Member] | Farmland [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 215,835	$ 195,162
Percent	4.31%	4.13%
Real Estate [Member] | One to Four Family Residences [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 978,196	$ 875,766
Percent	19.53%	18.55%
Real Estate [Member] | Multifamily Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 66,488	$ 46,030
Percent	1.33%	0.98%
Real Estate [Member] | Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 1,514,304	$ 1,487,927
Percent	30.24%	31.51%
Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 309,011	$ 284,373
Percent	6.17%	6.02%
Other (Not Classified Above) [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 36,781	$ 40,977
Percent	0.73%	0.87%

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Percentage of loans outstanding by category.

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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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