Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2014
Accounting Policies [Abstract]
Minimum past due of loans for nonaccrual status	90 days
Loans with identified weakness and principal balance	$ 100,000
Assignment of valuation allowance for specified amount of loan	$ 100,000

The minimum amount that a loan must be in order to be measured as an impaired loan using the original effective rate.

No definition available.

Name:	wbhc_MinimumAmountOfImpairedLoansMeasurementUsingOriginalEffectiveRate
Namespace Prefix:	wbhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant