Annual report pursuant to Section 13 and 15(d)

Premises and Equipment - Summary of Major Components of Premises and Equipment (Detail)

v3.3.1.900
Premises and Equipment - Summary of Major Components of Premises and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 60,272 $ 59,625  
Accumulated depreciation and amortization (30,075) (28,713)  
Impairment reserve (363) 0  
Total premises and equipment, net 29,834 30,912  
Depreciation and amortization expense 3,100 2,200 $ 1,900
Software [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 0 862  
Land [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 9,810 9,860  
Buildings and improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 19,455 19,598  
Furniture and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 19,711 17,902  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 11,296 $ 11,403