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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 11,184	$ 9,568
Impaired loans with a related allowance, Recorded Investment	11,534	6,480
Total impaired loans, Recorded Investment	22,718	16,048
Impaired loans with no related allowance, Unpaid Principal balance	11,277	10,009
Impaired loans with a related allowance, Unpaid Principal Balance	11,558	6,651
Total impaired loans, Unpaid Principal Balance	22,835	16,660
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	2,371	1,482
Total impaired loans, Related Allowance	2,371	1,482
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	782	466
Impaired loans with a related allowance, Recorded Investment	619	367
Impaired loans with no related allowance, Unpaid Principal balance	783	466
Impaired loans with a related allowance, Unpaid Principal Balance	623	367
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	124	45
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	8,427	5,705
Impaired loans with a related allowance, Recorded Investment	5,667	3,772
Impaired loans with no related allowance, Unpaid Principal balance	8,427	6,049
Impaired loans with a related allowance, Unpaid Principal Balance	5,673	3,772
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	1,568	1,000
Consumer Real Estate | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment		3,397
Impaired loans with a related allowance, Recorded Investment		2,341
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	1,975
Impaired loans with a related allowance, Recorded Investment	4,899
Impaired loans with no related allowance, Unpaid Principal balance	2,067	3,494
Impaired loans with a related allowance, Unpaid Principal Balance	4,907	2,512
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	672	$ 437
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with a related allowance, Recorded Investment	349
Impaired loans with a related allowance, Unpaid Principal Balance	355
Impaired loans with a related allowance, Related Allowance	$ 7

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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-Section 50
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