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Bank Premises and Equipment (Premises and Equipment) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Total cost   $ 21,537 $ 23,667
Less accumulated depreciation   (10,463) (9,674)
Net book value of bank premises and equipment $ 11,190 11,074 13,993
Assets held for sale   1,894  
Total bank premises and equipment   12,968 13,993
Land [Member]      
Property, Plant and Equipment [Line Items]      
Total cost   2,315 2,906
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Total cost   9,517 10,789
Furniture, Fixtures, and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total cost   8,184 8,742
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total cost   1,432 1,212
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Total cost   $ 89 $ 18