Annual report pursuant to Section 13 and 15(d)

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

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Premises and Equipment - Summary of Major Components of Premises and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 62,416 $ 59,452  
Accumulated depreciation and amortization (34,664) (32,797)  
Total premises and equipment, net 27,752 26,655  
Depreciation and amortization expense 2,600 2,900 $ 2,900
Land      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 8,470 8,470  
Buildings and improvements      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 17,252 17,261  
Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 24,144 21,271  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 11,671 11,571  
Leased equipment      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 879 $ 879