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Borrowings - Additional Information (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
FHLB borrowings   $ 65,000,000 $ 90,000,000
Letters of credit provided for collateralize public unit deposits   22,690,000  
Qualifying loans   874,680,000  
Junior subordinated debentures      
Debt Instrument [Line Items]      
Junior subordinated debentures issued   $ 15,460,000  
Debentures mature date   Oct. 08, 2033  
Junior subordinated debentures | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Debt instrument, percentage points to be added to the reference rate   2.95%  
FHLB Borrowings      
Debt Instrument [Line Items]      
FHLB borrowings $ 25,000,000    
FHLB Debt repayments 1,700,000    
Unused borrowing capacity   $ 403,100,000  
Unsecured Line of Credit      
Debt Instrument [Line Items]      
Debt instrument, percentage points to be added to the reference rate   2.00%  
Unsecured, committed line of credit, borrowing capacity   $ 15,000,000  
Unsecured, committed line of credit, interest rate   One-month LIBOR plus 2.00%  
Unsecured, committed line of credit, maturity date   Apr. 30, 2016  
Unsecured, committed line of credit, outstanding amount   $ 0 $ 2,000,000
Federal Home Loan Bank 4.15% Due 2017      
Debt Instrument [Line Items]      
FHLB Prepaid borrowing amount $ 25,000,000    
FHLB Interest rate 4.15%    
FHLB maturity date 2017