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Aging of Past Due Loans by Loan Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 25,079	$ 24,126
Current Loans	1,681,462	1,665,290
Total loans	1,706,541	1,689,416
Not covered under loss share agreements	1,623,506	1,567,176
Covered under loss share agreements	83,035	122,240
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	898,087	862,043
Covered under loss share agreements	25,529	49,340
Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	48,896	41,271
Covered under loss share agreements	6,303	13,100
Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	88,903	83,099
Covered under loss share agreements	1,170	2,662
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	95,026	97,480
Covered under loss share agreements	640	1,584
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	149,351	135,171
Covered under loss share agreements	2,674	5,918
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	485,460	473,906
Covered under loss share agreements	14,065	25,317
Commercial Loans | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	2,911	1,599
Covered under loss share agreements	34	43
Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	27,540	29,517
Covered under loss share agreements	643	716
Consumer Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	646,081	629,231
Covered under loss share agreements	57,422	72,812
Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	107,367	110,957
Covered under loss share agreements	48,565	60,391
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	495,209	485,475
Covered under loss share agreements	8,595	11,968
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	43,505	32,799
Covered under loss share agreements	262	453
Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	72,000	69,347
Covered under loss share agreements	84	88
Consumer and Other | Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Not covered under loss share agreements	7,338	6,555
Non Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	22,397	20,208
Current Loans	1,601,109	1,546,968
Non Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	39	85
Current Loans	48,857	41,186
Non Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	347	394
Current Loans	88,556	82,705
Non Covered Loans | Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	462	191
Current Loans	94,564	97,289
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,797	1,852
Current Loans	147,554	133,319
Non Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,963	3,842
Current Loans	479,497	470,064
Non Covered Loans | Commercial Loans | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		4
Current Loans	2,911	1,595
Non Covered Loans | Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	830	89
Current Loans	26,710	29,428
Non Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,331	1,166
Current Loans	106,036	109,791
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11,256	11,931
Current Loans	483,953	473,544
Non Covered Loans | Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	43,505	32,799
Non Covered Loans | Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	372	654
Current Loans	71,628	68,693
Non Covered Loans | Consumer and Other | Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	7,338	6,555
Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,682	3,918
Current Loans	80,353	118,322
Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	138	137
Current Loans	6,165	12,963
Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	16	130
Current Loans	1,154	2,532
Covered Loans | Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	640	1,584
Covered Loans | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,422	199
Current Loans	1,252	5,719
Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	39	1,522
Current Loans	14,026	23,795
Covered Loans | Commercial Loans | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	34	43
Covered Loans | Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		3
Current Loans	643	713
Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	751	1,344
Current Loans	47,814	59,047
Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	316	583
Current Loans	8,279	11,385
Covered Loans | Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	262	453
Covered Loans | Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	84	88
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11,612	10,400
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9,331	8,955
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		39
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	281	285
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	302	81
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	748	914
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	347	1,075
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	585	89
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	668	492
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,122	5,436
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	278	544
Financing Receivables, 30 to 59 Days Past Due | Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,281	1,445
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	96	120
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		84
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,422	122
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		124
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		3
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	489	858
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	274	134
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,195	4,097
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,158	3,576
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		46
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	66	6
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	76	110
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	120	513
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	676	783
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	195	103
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,943	1,931
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	71	84
Financing Receivables, 60 to 89 Days Past Due | Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	37	521
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		17
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		12
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		140
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	37	318
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		34
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	10,272	9,629
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9,908	7,677
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	39
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		103
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	84
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	929	425
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,940	1,984
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		4
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	234
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	468	571
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,191	4,564
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	23	26
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	364	1,952
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	42
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	16	34
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		77
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	39	1,258
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	225	168
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 42	$ 415

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Loans And Leases Receivable, Net Of Deferred Income, Covered And Not Covered

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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 7A
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Paragraph 7A
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-Section 45
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