Earnings per Share - Stock Dividend (Details)	Jul. 01, 2021
Earnings Per Share [Abstract]
Special stock dividend, rate percent (in percent)	4.00%

The percentage rate used to calculate dividend payments on common stock.

No definition available.

Name:	hwbk_CommonStockDividendRatePercentage
Namespace Prefix:	hwbk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration