Loans Receivable, Net - Risk Category of Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Loan	$ 544,524	$ 533,122
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	66,924	57,967
Commercial Real Estate [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	462,031	463,287
Commercial Real Estate [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	15,569	11,868
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	510,095	497,614
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	66,565	57,341
Pass [Member] | Commercial Real Estate [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	428,939	429,393
Pass [Member] | Commercial Real Estate [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	14,591	10,880
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	2,271	2,281
Special Mention [Member] | Commercial Real Estate [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	1,765	1,775
Special Mention [Member] | Commercial Real Estate [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	506	506
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	31,257	32,148
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	359	391
Substandard [Member] | Commercial Real Estate [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	30,426	31,275
Substandard [Member] | Commercial Real Estate [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	472	482
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	901	1,079
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan		235
Doubtful [Member] | Commercial Real Estate [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	$ 901	$ 844