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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	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 9,781	$ 8,547
Impaired loans with a related allowance, Recorded Investment	12,692	10,931
Total impaired loans, Recorded Investment	22,473	19,478
Impaired loans with no related allowance, Unpaid Principal balance	10,397	9,332
Impaired loans with a related allowance, Unpaid Principal Balance	12,844	16,484
Total impaired loans, Unpaid Principal Balance	23,241	25,816
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	1,673	4,742
Total impaired loans, Related Allowance	1,673	4,742
Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	1,258	292
Impaired loans with a related allowance, Recorded Investment		4,897
Impaired loans with no related allowance, Unpaid Principal balance	1,439	292
Impaired loans with a related allowance, Unpaid Principal Balance		10,244
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance		3,794
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with a related allowance, Recorded Investment	5,567
Impaired loans with a related allowance, Unpaid Principal Balance	5,567
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	268	289
Impaired loans with a related allowance, Recorded Investment	369	375
Impaired loans with no related allowance, Unpaid Principal balance	268	317
Impaired loans with a related allowance, Unpaid Principal Balance	369	375
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	46	47
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	5,468	5,352
Impaired loans with a related allowance, Recorded Investment	4,382	600
Impaired loans with no related allowance, Unpaid Principal balance	5,812	5,682
Impaired loans with a related allowance, Unpaid Principal Balance	4,382	600
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	623	114
Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment		351
Impaired loans with no related allowance, Unpaid Principal balance		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		257
Impaired loans with no related allowance, Unpaid Principal balance		264
Impaired loans with no related allowance, Related Allowance
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	2,787	2,006
Impaired loans with a related allowance, Recorded Investment	2,374	4,844
Impaired loans with no related allowance, Unpaid Principal balance	2,878	2,414
Impaired loans with a related allowance, Unpaid Principal Balance	2,526	5,035
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	$ 504	$ 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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-Publisher FASB

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-Section 50

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