Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9

Reference 2: 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(a))

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 60

-Paragraph 47

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 51, 52, 53

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

Loans - Summary of Loans Secured by Commercial Real Estate (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate loans	$ 730,764	$ 738,282	$ 761,687
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Commercial real estate included in gross loans	456,010
Commercial real estate included in other loans held for sale	776
Total commercial real estate loans	456,786
Percentage of gross loans and other loans held for sale	62.40%
Percentage of Bank's total regulatory capital	388.40%
Construction, land development, and other land loans [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Commercial real estate included in gross loans	68,008
Commercial real estate included in other loans held for sale	776
Total commercial real estate loans	68,784
Percentage of gross loans and other loans held for sale	9.40%
Percentage of Bank's total regulatory capital	58.50%
Multifamily residential [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Commercial real estate included in gross loans	11,555
Commercial real estate included in other loans held for sale
Total commercial real estate loans	11,555
Percentage of gross loans and other loans held for sale	1.60%
Percentage of Bank's total regulatory capital	9.80%
Nonfarm nonresidential [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Commercial real estate included in gross loans	376,447
Commercial real estate included in other loans held for sale
Total commercial real estate loans	$ 376,447
Percentage of gross loans and other loans held for sale	51.40%
Percentage of Bank's total regulatory capital	320.10%