Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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

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

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details

- Definition

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.

+ References

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

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

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-Publisher AICPA

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+ Details

- Definition

Amount after allowance and 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

Composition of Loan Portfolio (Detail) (USD $)	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 708,398,000		$ 658,279,000
Deferred fee (income) costs, net	(635,000)		(690,000)
Percentage of loan portfolio	100.00%		100.00%
Allowance for loan losses	(14,648,000)	(13,634,000)	(15,627,000)	(18,101,000)
Loans, net	693,115,000		641,962,000
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	173,637,000		179,305,000
Percentage of loan portfolio	24.50%		27.20%
Allowance for loan losses	(8,408,000)	(6,223,000)	(8,908,000)	(10,017,000)
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	31,959,000		24,358,000
Percentage of loan portfolio	4.50%		3.70%
Commercial real estate \| Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	158,039,000		170,960,000
Percentage of loan portfolio	22.30%		26.00%
Commercial real estate \| All other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	155,118,000		121,813,000
Percentage of loan portfolio	21.90%		18.50%
Residential mortgage loans \| Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	74,930,000		65,545,000
Percentage of loan portfolio	10.60%		10.00%
Residential mortgage loans \| Residential mortgage loans - single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	87,227,000		68,613,000
Percentage of loan portfolio	12.30%		10.40%
Construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans			2,047,000
Percentage of loan portfolio			0.30%
Land development loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 27,488,000		$ 25,638,000
Percentage of loan portfolio	3.90%		3.90%