Loans Receivable, Net - Components of Loans Receivable, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Commercial:
Commercial and industrial	$ 141,195	$ 144,538
Total commercial	986,408	962,772
Consumer:
Residential mortgage	792,753	791,249
Residential construction	54,259	50,757
Home equity loans and lines	190,621	192,368
Other consumer	570	792
Total consumer	1,038,203	1,035,166
Total loans	2,024,611	1,997,938
Purchased credit impaired ("PCI") loans	376	461
Loans in process	(15,033)	(14,206)
Deferred origination costs, net	3,253	3,232
Allowance for loan losses	(16,214)	(16,722)	$ (16,419)	$ (16,317)
Total loans, net	1,996,993	1,970,703
Commercial Real Estate - Owner Occupied [Member]
Commercial:
Commercial real estate	308,666	307,509
Consumer:
Total loans	308,666	307,509
Allowance for loan losses	(2,363)	(2,292)	(3,829)	(3,627)
Commercial Real Estate - Investor [Member]
Commercial:
Commercial real estate	536,547	510,725
Consumer:
Total loans	536,547	510,725
Allowance for loan losses	$ (4,302)	$ (4,873)	$ (5,471)	$ (5,308)