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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
State
Branch
Segment
Location
Dec. 31, 2015
USD ($)
Summary Of Significant Accounting Policies [Line Items]    
Assets managed by the Company $ 755,000  
Assets $ 2,470,287 $ 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 49  
Number of states the company provides services | State 4