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Recorded Investment and Related Information for Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 10,889	$ 9,568
Impaired loans with a related allowance, Recorded Investment	11,131	6,480
Total impaired loans, Recorded Investment	22,020	16,048
Impaired loans with no related allowance, Unpaid Principal balance	11,348	10,009
Impaired loans with a related allowance, Unpaid Principal Balance	11,171	6,651
Total impaired loans, Unpaid Principal Balance	22,519	16,660
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	2,641	1,482
Total impaired loans, Related Allowance	2,641	1,482
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	783	466
Impaired loans with a related allowance, Recorded Investment	621	367
Impaired loans with no related allowance, Unpaid Principal balance	785	466
Impaired loans with a related allowance, Unpaid Principal Balance	624	367
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	117	45
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	8,772	5,705
Impaired loans with a related allowance, Recorded Investment	5,359	3,772
Impaired loans with no related allowance, Unpaid Principal balance	9,159	6,049
Impaired loans with a related allowance, Unpaid Principal Balance	5,374	3,772
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	1,711	1,000
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	1,334	3,397
Impaired loans with a related allowance, Recorded Investment	4,798	2,341
Impaired loans with no related allowance, Unpaid Principal balance	1,404	3,494
Impaired loans with a related allowance, Unpaid Principal Balance	4,817	2,512
Impaired loans with no related allowance, Related Allowance	0	0
Impaired loans with a related allowance, Related Allowance	760	$ 437
Consumer Real Estate | Owner occupied construction
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with a related allowance, Recorded Investment	353
Impaired loans with a related allowance, Unpaid Principal Balance	356
Impaired loans with a related allowance, Related Allowance	$ 53

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