Loans Receivable, Net - Risk Category of Loans by Loan Portfolio Segment Excluding PCI Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loan	$ 962,772	$ 733,897
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	818,234	649,951
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	144,538	83,946
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	925,752	694,680
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	783,365	611,987
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	142,387	82,693
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	12,857	12,857
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	12,070	12,684
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	787	173
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	24,163	26,360
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	22,799	25,280
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan	$ 1,364	$ 1,080