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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 6,271	$ 11,184
Impaired loans with a related allowance, Recorded Investment	10,527	11,534
Total impaired loans, Recorded Investment	16,798	22,718
Impaired loans with no related allowance, Unpaid Principal balance	6,323	11,277
Impaired loans with a related allowance, Unpaid Principal Balance	10,592	11,558
Total impaired loans, Unpaid Principal Balance	16,915	22,835
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	2,386	2,371
Total impaired loans, Related Allowance	2,386	2,371
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	457	782
Impaired loans with a related allowance, Recorded Investment	678	619
Impaired loans with no related allowance, Unpaid Principal balance	457	783
Impaired loans with a related allowance, Unpaid Principal Balance	680	623
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	108	124
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	4,747	8,427
Impaired loans with a related allowance, Recorded Investment	5,300	5,667
Impaired loans with no related allowance, Unpaid Principal balance	4,747	8,427
Impaired loans with a related allowance, Unpaid Principal Balance	5,319	5,673
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	1,518	1,568
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	724	1,975
Impaired loans with a related allowance, Recorded Investment	4,549	4,899
Impaired loans with no related allowance, Unpaid Principal balance	766	2,067
Impaired loans with a related allowance, Unpaid Principal Balance	4,593	4,907
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	760	672
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	343
Impaired loans with a related allowance, Recorded Investment		349
Impaired loans with no related allowance, Unpaid Principal balance	353
Impaired loans with a related allowance, Unpaid Principal Balance		355
Impaired loans with no related allowance, Related Allowance	$ 0	0
Impaired loans with a related allowance, Related Allowance		$ 7

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
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-Publisher FASB
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