Basis of Presentation (Details)	6 Months Ended
Jun. 30, 2020 Office
Basis of Presentation [Abstract]
Number of offices	13
Percentage increase to allowance for credit loss	130.00%

Amount of percentage increase in allowance for credit loss.

No definition available.

Name:	wsbf_AllowanceForCreditLossPercentageIncrease
Namespace Prefix:	wsbf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration