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Premises and Equipment (Composition of Premises and Equipment) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Premises and equipment $ 52,320 $ 51,144
Less accumulated depreciation (25,160) (25,946)
Premises and equipment, net 27,160 25,198
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 7,383 7,304
Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 1,201 1,210
Premises [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 25,696 25,272
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 17,506 16,824
Capital Lease [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment $ 534 $ 534