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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	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 8,547	$ 9,418
Impaired loans with a related allowance, Recorded Investment	10,931	13,784
Total impaired loans, Recorded Investment	19,478	23,202
Impaired loans with no related allowance, Average Recorded Investment	15,728	10,397
Impaired loans with a related allowance, Average Recorded Investment	12,620	16,780
Total impaired loans, Average Recorded Investment	28,348	27,177
Impaired loans with no related allowance, Unpaid Principal balance	9,332	9,906
Impaired loans with a related allowance, Unpaid Principal Balance	16,484	19,450
Total impaired loans, Unpaid Principal Balance	25,816	29,356
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	4,742	5,593
Total impaired loans, Related Allowance	4,742	5,593
Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment		2,916
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment		284
Impaired loans with a related allowance, Recorded Investment		3,318
Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with a related allowance, Recorded Investment		378
Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment		383
Impaired loans with a related allowance, Recorded Investment		2,411
Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment		5,282
Impaired loans with a related allowance, Recorded Investment		2,781
Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment		276
Impaired loans with a related allowance, Recorded Investment		223
Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment		277
Impaired loans with a related allowance, Recorded Investment		4,673
Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Average Recorded Investment	3,850	935
Impaired loans with a related allowance, Average Recorded Investment	1,057	69
Impaired loans with no related allowance, Unpaid Principal balance		2,916
Impaired loans with no related allowance, Related Allowance
Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	292
Impaired loans with a related allowance, Recorded Investment	4,897
Impaired loans with no related allowance, Average Recorded Investment	698	320
Impaired loans with a related allowance, Average Recorded Investment	4,281	4,510
Impaired loans with no related allowance, Unpaid Principal balance	292	284
Impaired loans with a related allowance, Unpaid Principal Balance	10,244	8,502
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	3,794	3,192
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Average Recorded Investment	18	517
Impaired loans with a related allowance, Average Recorded Investment	94	143
Impaired loans with a related allowance, Unpaid Principal Balance		397
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance		18
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	289
Impaired loans with a related allowance, Recorded Investment	375
Impaired loans with no related allowance, Average Recorded Investment	939	1,101
Impaired loans with a related allowance, Average Recorded Investment	892	2,484
Impaired loans with no related allowance, Unpaid Principal balance	317	684
Impaired loans with a related allowance, Unpaid Principal Balance	375	2,460
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	47	996
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	5,352
Impaired loans with a related allowance, Recorded Investment	600
Impaired loans with no related allowance, Average Recorded Investment	7,225	2,619
Impaired loans with a related allowance, Average Recorded Investment	1,494	5,820
Impaired loans with no related allowance, Unpaid Principal balance	5,682	5,362
Impaired loans with a related allowance, Unpaid Principal Balance	600	2,958
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	114	358
Commercial Loans | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Related Allowance
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, Average Recorded Investment	370	93
Impaired loans with a related allowance, Average Recorded Investment		93
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 a related allowance, Recorded Investment	215
Impaired loans with no related allowance, Average Recorded Investment	454	370
Impaired loans with a related allowance, Average Recorded Investment	304	150
Impaired loans with no related allowance, Unpaid Principal balance	264	277
Impaired loans with a related allowance, Unpaid Principal Balance	230	230
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	52	223
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Recorded Investment	2,006
Impaired loans with a related allowance, Recorded Investment	4,844
Impaired loans with no related allowance, Average Recorded Investment	2,156	4,441
Impaired loans with a related allowance, Average Recorded Investment	4,498	3,511
Impaired loans with no related allowance, Unpaid Principal balance	2,414	383
Impaired loans with a related allowance, Unpaid Principal Balance	5,035	4,903
Impaired loans with no related allowance, Related Allowance
Impaired loans with a related allowance, Related Allowance	735	806
Consumer Real Estate | Owner occupied construction
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Average Recorded Investment	15
Impaired loans with no related allowance, Related Allowance
Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance, Average Recorded Investment	3	1
Impaired loans with no related allowance, Related Allowance

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