Risk Category of Loans by Class of Loans (Excluding Mortgage Loans Held for Sale) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	$ 26,467	$ 385,152
Unearned discount	174	130
Total	388,062	385,022
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	368,411	358,272
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	6,531	5,288
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	13,233	21,313
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	61	279
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	249,382	245,676
Unearned discount	93	94
Total	249,289	245,582
Commercial Real Estate \| Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	230,865	223,692
Commercial Real Estate \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	6,356	5,169
Commercial Real Estate \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	12,161	16,815
Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	65,237	60,563
Unearned discount	71	34
Total	65,166	60,529
Real Estate \| Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	64,411	57,835
Real Estate \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	148	71
Real Estate \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	678	2,553
Real Estate \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross		104
Installment and Other
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	21,684	16,148
Total	21,684	16,148
Installment and Other \| Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	21,603	16,004
Installment and Other \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	27	45
Installment and Other \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	54	99
Commercial Financial And Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	51,933	62,765
Unearned discount	10	2
Total	51,923	62,763
Commercial Financial And Agricultural \| Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	51,532	60,741
Commercial Financial And Agricultural \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross		3
Commercial Financial And Agricultural \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	340	1,846
Commercial Financial And Agricultural \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable, gross	$ 61	$ 175

Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph a(i-v)

-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 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.

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph f

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 20

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6378556&loc=d3e10152-111534

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 9

Reference 6: 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 7: 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 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph a(i)(d)

-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 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=6952072&loc=d3e45377-112738

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

- 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+ Details