Loans Receivable, Net - Risk Category of Loans by Loan Portfolio Segment Excluding PCI Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loan	$ 986,408	$ 962,772
Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	308,666	307,509
Commercial Real Estate - Investor [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	536,547	510,725
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	141,195	144,538
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	951,615	925,752
Pass [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	289,814	288,701
Pass [Member] | Commercial Real Estate - Investor [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	522,234	494,664
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	139,567	142,387
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	12,305	12,857
Special Mention [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	4,923	1,803
Special Mention [Member] | Commercial Real Estate - Investor [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	6,720	10,267
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	662	787
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	22,488	24,163
Substandard [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	13,929	17,005
Substandard [Member] | Commercial Real Estate - Investor [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	7,593	5,794
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	$ 966	$ 1,364