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Investment in Loans Related to Each Segment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	$ 27,144	$ 23,202
Allowance for Loans Individually Evaluated	5,256	5,593
Loans Collectively Evaluated for Impairment	1,579,120	1,562,360
Allowance for Loans Collectively Evaluated	18,366	20,169
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	18,706	17,753
Allowance for Loans Individually Evaluated	4,040	4,564
Loans Collectively Evaluated for Impairment	842,772	833,652
Allowance for Loans Collectively Evaluated	12,017	12,695
Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	4,688	2,916
Allowance for Loans Individually Evaluated	347
Loans Collectively Evaluated for Impairment	61,896	55,369
Allowance for Loans Collectively Evaluated	1,476	1,214
Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	4,743	3,602
Allowance for Loans Individually Evaluated	3,648	3,192
Loans Collectively Evaluated for Impairment	93,951	88,811
Allowance for Loans Collectively Evaluated	1,462	1,159
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment		378
Allowance for Loans Individually Evaluated		18
Loans Collectively Evaluated for Impairment	57,555	67,278
Allowance for Loans Collectively Evaluated	1,008	1,612
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	602	2,794
Allowance for Loans Individually Evaluated	38	996
Loans Collectively Evaluated for Impairment	133,191	134,323
Allowance for Loans Collectively Evaluated	3,363	3,371
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	8,014	8,063
Allowance for Loans Individually Evaluated	7	358
Loans Collectively Evaluated for Impairment	461,592	451,240
Allowance for Loans Collectively Evaluated	4,399	4,901
Commercial Loans | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	2,450	1,852
Allowance for Loans Collectively Evaluated	19	22
Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	659
Loans Collectively Evaluated for Impairment	32,137	34,779
Allowance for Loans Collectively Evaluated	290	416
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	8,438	5,449
Allowance for Loans Individually Evaluated	1,216	1,029
Loans Collectively Evaluated for Impairment	659,889	642,005
Allowance for Loans Collectively Evaluated	5,700	6,877
Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	1,060	499
Allowance for Loans Individually Evaluated	434	223
Loans Collectively Evaluated for Impairment	135,868	141,684
Allowance for Loans Collectively Evaluated	1,267	1,351
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Non-acquired Loans Individually Evaluated for Impairment	7,378	4,950
Allowance for Loans Individually Evaluated	782	806
Loans Collectively Evaluated for Impairment	498,208	483,553
Allowance for Loans Collectively Evaluated	4,230	5,189
Consumer Real Estate | Owner occupied construction
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	25,813	16,768
Allowance for Loans Collectively Evaluated	203	337
Consumer and Other
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	76,459	86,703
Allowance for Loans Collectively Evaluated	649	597
Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	71,751	81,037
Allowance for Loans Collectively Evaluated	649	597
Consumer and Other | Other
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	$ 4,708	$ 5,666

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

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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 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

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+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

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