Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) State Branch Segment Location	Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Assets managed by the Company	$ 770,000
Assets	$ 2,495,328	$ 2,462,276
Number of business segment | Segment	1
Greenpoint Insurance Group
Summary Of Significant Accounting Policies [Line Items]
Number of locations the Company provides services | Location	9
First Community Bank
Summary Of Significant Accounting Policies [Line Items]
Number of operating branches | Branch	48
Number of states the company provides services | State	4