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Deposits - Additional Information (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
Overdrafts reclassified as loans receivable $ 373,000wbhc_OverDraftsReclassifiedAsLoansReceivable $ 212,000wbhc_OverDraftsReclassifiedAsLoansReceivable
Average required cash balance $ 0wbhc_MinimumAverageYearlyCashBalance $ 0wbhc_MinimumAverageYearlyCashBalance