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Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 5,042,502	$ 4,975,976
Percent	100.00%	100.00%
Taxable [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 73,051	$ 76,211
Percent	1.45%	1.53%
Tax-exempt [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 49,833	$ 48,415
Percent	0.99%	0.97%
Commercial and Financial [Member] | Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 1,043,848	$ 1,032,787
Percent	20.70%	20.76%
Commercial and Financial [Member] | Oil & Gas Production And Equipment [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 106,991	$ 94,729
Percent	2.12%	1.90%
Commercial and Financial [Member] | Agriculture [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 130,717	$ 136,313
Percent	2.59%	2.74%
Real Estate [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 469,826	$ 451,224
Percent	9.32%	9.07%
Real Estate [Member] | Farmland [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 227,526	$ 219,241
Percent	4.51%	4.41%
Real Estate [Member] | One to Four Family Residences [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 982,605	$ 979,170
Percent	19.49%	19.68%
Real Estate [Member] | Multifamily Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 68,412	$ 65,949
Percent	1.36%	1.33%
Real Estate [Member] | Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 1,514,266	$ 1,506,937
Percent	30.03%	30.28%
Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 326,002	$ 328,069
Percent	6.46%	6.59%
Other (Not Classified Above) [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 49,425	$ 36,931
Percent	0.98%	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://fasb.org/us-gaap/role/ref/legacyRef
-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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