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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
Jun. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill   $ 64,311 $ 63,462
Bank of America [Member]      
Business Acquisition [Line Items]      
Cash paid $ 3,204    
Cost basis net assets acquired 0    
Goodwill 849    
Bank of America [Member] | Premises and equipment [Member]      
Business Acquisition [Line Items]      
Fair Value Adjustments (309)    
Bank of America [Member] | Core deposit intangibles [Member]      
Business Acquisition [Line Items]      
Fair Value Adjustments $ (2,046)