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Premises and Equipment, Net - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross   $ 167,538
Finance lease $ 2,572  
Total 162,267  
Accumulated depreciation and amortization (59,576)  
Accumulated depreciation and amortization   (56,329)
Premises and equipment, net 102,691  
Premises and equipment, net   111,209
Land    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 24,446 25,415
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 97,653 101,211
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 9,274 7,465
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 25,558 22,373
Finance lease    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross   8,630
Other    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 2,764 $ 2,444