Loans - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended				1 Months Ended			1 Months Ended		12 Months Ended			12 Months Ended
	Jun. 30, 2012	Dec. 31, 2012 Loan	Dec. 31, 2011	Mar. 30, 2012	Mar. 30, 2012 Preferred Stock	Mar. 30, 2012 Minority Owned Unconsolidated	Dec. 31, 2012 Revolving lines of credit	Mar. 30, 2012 Revolving lines of credit	Mar. 30, 2012 Term note	Mar. 30, 2012 Contingent consideration	Dec. 31, 2011 Loans held for sale	Dec. 31, 2012 Commercial real estate loans	Dec. 31, 2011 Commercial real estate loans	Dec. 31, 2012 Maximum	Dec. 31, 2012 Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate loan, maturity period														30 years
Residential real estate loan, amortization period															30 years
Reclassified loans receivable, net	$ 23,000,000	$ 23,000,000
Loans receivable commitment to lend								7,000,000
Loans receivable, net		24,372,000	3,750,000				0	3,200,000				1,672,000	1,873,000
Loans receivable, interest rate above prime								2.75%	2.75%
Loans receivable, floor interest rate								5.75%	5.75%
Loans receivable maturity date								Mar. 31, 2017	Mar. 31, 2017
Loans receivable									1,000,000
Loans receivable, first principal due date									Apr. 01, 2015
Preferred stock stated value						2,000,000
Cumulative preferred return rate						4.00%
Preferred stock convertible rate into common stock						45.00%
Contingent consideration potential payment				500,000
Estimated fair value of consideration received as partial consideration for assets sold					800,000			3,200,000	400,000	0
Contingent consideration received		500,000
Impaired financing receivable, average recorded investment		11,900,000	800,000								11,200,000
Impaired financing receivable, interest income recognized		1,200,000	300,000
Number of loans receivable, net modified		3
Loans receivable, net modified		1,000,000
Losses on troubled debt restructurings			100,000
Loans modified under troubled debt restructurings reached ninety or more days past due		200,000
Loans held for sale, sixty or more days past due		3,400,000
Loans held for sale, sixty or more days past due, percentage		15.20%
Estimated fair value of loans as percentage of unpaid principal balance		49.00%
Provision for loan losses			2,000
Allowance for loan losses												50,000	50,000
Loans held for sale, impaired			11,200,000
Loans held for sale, nonaccrual			1,900,000
Loans held for sale, thirty or more days past due			$ 600,000