Earnings per Share (Parentheticals) (Details 2)	3 Months Ended	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Earnings Per Share [Abstract]
Common Stock, Dividend Rate, Percentage	4.00%	4.00%	4.00%

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

No definition available.

Name:	hwbk_CommonStockDividendRatePercentage
Namespace Prefix:	hwbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration