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Business Combinations - Summary of Cash Paid and Estimated Fair Value Adjustments Resulting in Goodwill (Detail) - USD ($)
$ in Thousands
Mar. 18, 2016
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill   $ 64,311 $ 64,311
Bank of America [Member]      
Business Acquisition [Line Items]      
Cash paid $ 3,204    
Cost basis net assets acquired 0    
Fair Value Adjustments, Premises and Equipment (309)    
Core deposit intangible (2,046)    
Goodwill 849    
Bank of America [Member] | Loans [Member]      
Business Acquisition [Line Items]      
Fair Value Adjustments $ 0