XML 28 R17.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Line of Credit | 12 Months Ended
--- | ---
Dec. 31, 2023
Text Block [Abstract] |
Line of Credit | 8. Line of Credit The Company has an agreement providing for a line of credit in the maximum amount of $20.0 million with Frost Bank. The agreement was renewed in December 2023. Under the agreement, advances may be made either in the form of loans or letters of credit. Borrowings under the agreement accrue at interest rates based upon prime rate or the one-month term SOFR rate. The line of credit is unsecured. No borrowings or letters of credit were outstanding under the line of credit arrangement at December 31, 2023 or 2022.

X
- Definition Line of credit text block. + References No definition available. + Details
Name: | amsf_LineOfCreditTextBlock
Namespace Prefix: | amsf_
Data Type: | dtr-types: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