XML 42 R27.htm IDEA: XBRL DOCUMENT
v3.20.4

Capital Management | 12 Months Ended
--- | ---
Dec. 31, 2020
Text Block [Abstract] |
Capital Management |
20. | Capital Management
The Company’s Board of Directors initiated a share repurchase program in February 2010. In October 2016, the Board reauthorized this program with a limit of $25.0 million with no expiration date. There were no shares repurchased under this program in 2020. Since the beginning of this plan, the Company has repurchased a total of 1,258,250 shares for $22.4 million, or an average price of $17.78, including commissions. In 2013, the Company’s Board of Directors initiated a regular quarterly dividend. During 2020, the Company’s Board of Directors declared a quarterly dividend of $0.27 per share compared to $0.25 per share in 2019, and $0.22 per share in 2018. The Company declared extraordinary dividends totaling $3.50 per share in each of 2020, 2019 and 2018.

X
- Definition Capital management and dividends. + References No definition available. + Details
Name: | amsf_CapitalManagementAndDividendsTextBlock
Namespace Prefix: | amsf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration