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Merger - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 06, 2015
Sep. 30, 2015
Dec. 31, 2014
Net assets acquired:      
Goodwill   $ 27,095 $ 21,720
TCNB Financial Corp [Member]      
Business Acquisition [Line Items]      
Total purchase price $ 17,226    
Net assets acquired:      
Cash and short-term investments 18,152    
Loans, net 76,444    
Other securities 716    
Premises and equipment 1,738    
Accrued interest receivable 194    
Core deposit intangible 1,009    
Other assets 472    
Noninterest-bearing deposits (18,263)    
Interest-bearing deposits (68,606)    
Other liabilities (5)    
Net assets acquired 11,851    
Goodwill $ 5,375