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Company's Investment in Loans Held for Investment by Internal Credit Grade Indicator (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	$ 1,505,598	$ 1,396,067
Covered under loss share agreements	219,055
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	821,514	712,040
Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	49,460	61,768
Covered under loss share agreements	34,569
Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	88,714	91,939
Covered under loss share agreements	6,972
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	65,694	77,050
Covered under loss share agreements	2,611
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	135,647	106,743
Covered under loss share agreements	11,693
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	445,889	336,005
Covered under loss share agreements	51,486
Commercial Loans | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	1,709	1,374
Covered under loss share agreements	144
Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	34,401	37,161
Covered under loss share agreements	1,260
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	600,255	604,031
Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	111,081	111,387
Covered under loss share agreements	81,445
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	472,951	473,067
Covered under loss share agreements	23,557
Consumer Real Estate | Owner occupied construction
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	16,223	19,577
Covered under loss share agreements	1,644
Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	78,163	67,129
Covered under loss share agreements	3,674
Consumer and Other | Other
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	5,666	12,867
Pass
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	1,350,270	1,287,286
Covered under loss share agreements	93,402
Pass | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	33,876	54,162
Covered under loss share agreements	14,437
Pass | Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	77,549	86,288
Covered under loss share agreements	6,249
Pass | Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	60,161	74,486
Covered under loss share agreements	1,962
Pass | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	112,297	93,444
Covered under loss share agreements	6,330
Pass | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	396,986	303,071
Covered under loss share agreements	26,776
Pass | Commercial Loans | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	1,657	1,327
Covered under loss share agreements	143
Pass | Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	28,718	35,568
Covered under loss share agreements	1,104
Pass | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	104,750	105,535
Covered under loss share agreements	16,323
Pass | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	435,991	435,001
Covered under loss share agreements	16,607
Pass | Consumer Real Estate | Owner occupied construction
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	15,841	19,190
Covered under loss share agreements	484
Pass | Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	76,787	66,357
Covered under loss share agreements	2,987
Pass | Consumer and Other | Other
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	5,657	12,857
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	45,835	30,720
Covered under loss share agreements	23,735
Special Mention | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	1,497	5,644
Covered under loss share agreements	2,120
Special Mention | Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	2,506	568
Covered under loss share agreements	445
Special Mention | Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	4,043	965
Special Mention | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	5,938	1,346
Covered under loss share agreements	2,223
Special Mention | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	15,975	9,635
Covered under loss share agreements	5,477
Special Mention | Commercial Loans | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	19	7
Special Mention | Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	2,262	1,055
Special Mention | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	2,739	2,237
Covered under loss share agreements	11,981
Special Mention | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	9,599	8,936
Covered under loss share agreements	927
Special Mention | Consumer Real Estate | Owner occupied construction
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	382	128
Special Mention | Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	867	198
Covered under loss share agreements	562
Special Mention | Consumer and Other | Other
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	8	1
Substandard
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	103,624	75,213
Covered under loss share agreements	101,228
Substandard | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	13,546	1,962
Covered under loss share agreements	17,834
Substandard | Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	4,821	2,679
Covered under loss share agreements	197
Substandard | Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	1,490	1,599
Covered under loss share agreements	649
Substandard | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	16,092	11,953
Covered under loss share agreements	3,015
Substandard | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	32,808	22,855
Covered under loss share agreements	19,189
Substandard | Commercial Loans | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	33	40
Covered under loss share agreements	1
Substandard | Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	3,421	538
Covered under loss share agreements	156
Substandard | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	3,592	3,615
Covered under loss share agreements	53,116
Substandard | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	27,319	29,130
Covered under loss share agreements	5,786
Substandard | Consumer Real Estate | Owner occupied construction
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements		259
Covered under loss share agreements	1,160
Substandard | Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	501	574
Covered under loss share agreements	125
Substandard | Consumer and Other | Other
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	1	9
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	5,827	2,848
Covered under loss share agreements	690
Doubtful | Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	541
Covered under loss share agreements	178
Doubtful | Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	3,838	2,404
Covered under loss share agreements	81
Doubtful | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	1,320
Covered under loss share agreements	125
Doubtful | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	120	444
Covered under loss share agreements	44
Doubtful | Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Covered under loss share agreements	25
Doubtful | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Covered under loss share agreements	237
Doubtful | Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	8
Loss
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	42
Loss | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Not covered under loss share agreements	$ 42

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- Definition

Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements.

+ References

No definition available.

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph e

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 116

-IssueDate 2006-05-01

-Chapter 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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