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Recorded Investment and Related Information for Loans Considered to be Impaired Excluding Purchased Credit Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 8,566	$ 8,547
Impaired loans with a related allowance, Recorded Investment	19,951	10,931
Total impaired loans, Recorded Investment	28,517	19,478
Impaired loans with no related allowance, Unpaid Principal balance	9,343	9,332
Impaired loans with a related allowance, Unpaid Principal Balance	20,557	16,484
Total impaired loans, Unpaid Principal Balance	29,900	25,816
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	5,282	4,742
Total impaired loans, Related Allowance	5,282	4,742
Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	292	292
Impaired loans with a related allowance, Recorded Investment	4,943	4,897
Impaired loans with no related allowance, Unpaid Principal balance	292	292
Impaired loans with a related allowance, Unpaid Principal Balance	5,319	10,244
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	3,504	3,794
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with a related allowance, Recorded Investment	5,601
Impaired loans with a related allowance, Unpaid Principal Balance	5,601
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	500
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	420	289
Impaired loans with a related allowance, Recorded Investment	364	375
Impaired loans with no related allowance, Unpaid Principal balance	420	317
Impaired loans with a related allowance, Unpaid Principal Balance	371	375
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	38	47
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	5,559	5,352
Impaired loans with a related allowance, Recorded Investment	4,458	600
Impaired loans with no related allowance, Unpaid Principal balance	5,903	5,682
Impaired loans with a related allowance, Unpaid Principal Balance	4,459	600
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	377	114
Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	351	351
Impaired loans with no related allowance, Unpaid Principal balance	363	363
Impaired loans with no related allowance, Related Allowance
Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	254	257
Impaired loans with a related allowance, Recorded Investment	208	215
Impaired loans with no related allowance, Unpaid Principal balance	264	264
Impaired loans with a related allowance, Unpaid Principal Balance	229	230
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	171	52
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	1,690	2,006
Impaired loans with a related allowance, Recorded Investment	4,377	4,844
Impaired loans with no related allowance, Unpaid Principal balance	2,101	2,414
Impaired loans with a related allowance, Unpaid Principal Balance	4,578	5,035
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	$ 692	$ 735

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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