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Business Combinations - Additional Information (Detail) - Central National Bank & Trust [Member] - USD ($)
$ in Millions
Jul. 12, 2016
Mar. 31, 2016
Jun. 30, 2016
Business Acquisition [Line Items]      
Cash consideration received as special dividend   $ 6.7  
Payments received as cash consideration   $ 5.3  
Reported total assets of acquiree     $ 56.4
Subsequent Event [Member]      
Business Acquisition [Line Items]      
Percentage of cash consideration received as capital in excess of assets 8.00%    
Percentage of cash consideration received from parent as percentage of remaining capital 120.00%