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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 7,436	$ 11,184
Impaired loans with a related allowance, Recorded Investment	9,358	11,534
Total impaired loans, Recorded Investment	16,794	22,718
Impaired loans with no related allowance, Unpaid Principal balance	7,652	11,277
Impaired loans with a related allowance, Unpaid Principal Balance	9,442	11,558
Total impaired loans, Unpaid Principal Balance	17,094	22,835
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	2,803	2,371
Total impaired loans, Related Allowance	2,803	2,371
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	292
Impaired loans with no related allowance, Unpaid Principal balance	297
Impaired loans with no related allowance, Related Allowance	0	0
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	455	782
Impaired loans with a related allowance, Recorded Investment	676	619
Impaired loans with no related allowance, Unpaid Principal balance	455	783
Impaired loans with a related allowance, Unpaid Principal Balance	677	623
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	107	124
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	5,210	8,427
Impaired loans with a related allowance, Recorded Investment	4,599	5,667
Impaired loans with no related allowance, Unpaid Principal balance	5,352	8,427
Impaired loans with a related allowance, Unpaid Principal Balance	4,636	5,673
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	1,843	1,568
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	1,137	1,975
Impaired loans with a related allowance, Recorded Investment	4,083	4,899
Impaired loans with no related allowance, Unpaid Principal balance	1,195	2,067
Impaired loans with a related allowance, Unpaid Principal Balance	4,129	4,907
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	853	672
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	342
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

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