Loans Receivable, Net - Risk Category of Loans by Loan Portfolio Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loan	$ 809,515	$ 733,897
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	698,286	649,951
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	111,229	83,946
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	757,327	694,680
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	650,776	611,987
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	106,551	82,693
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	26,131	12,857
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	24,264	12,684
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	1,867	173
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	26,057	26,360
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	23,246	25,280
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	$ 2,811	$ 1,080