Fair Value Measurements - Additional Information (Detail)	6 Months Ended
Jun. 30, 2015 TransferStation
Fair Value Disclosures [Abstract]
Transfers between levels one, two and three	0

Amount of transfers of assets measured on a recurring basis between levels 1, 2, and 3 of the fair value hierarchy.

No definition available.

Name:	wbhc_FairValueTransfersBetweenLevelsOneTwoAndThree
Namespace Prefix:	wbhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration