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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]  
Minimum past due of loans for nonaccrual status 90 days
Loans with identified weakness and principal balance $ 100,000wbhc_MinimumAmountOfImpairedLoansMeasurementUsingOriginalEffectiveRate
Loans with identified weakness and principal balance 500,000wbhc_MaximumAmountOfImpairedLoansMeasurementUsingOriginalEffectiveRate
Assignment of valuation allowance for specified amount of loan $ 500,000wbhc_MaximumAmountOfImpairedLoansForMeasurementUsingAllocationRate