XML 34 R24.htm IDEA: XBRL DOCUMENT v3.10.0.1

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets Measured at Fair Value on Recurring Basis

At September 30, 2018, assets measured at fair value on a recurring basis are summarized below:

		September 30, 2018
		Level 1 Inputs				Level 2 Inputs				Level 3 Inputs				Total Fair Value
		(in thousands)
Financial instruments carried at fair value, classified as a part of:
Securities available-for-sale—fixed maturity:
States and political subdivisions		$	—			$	227,487			$	—			$	227,487
Corporate bonds			—				162,948				—				162,948
U.S. agency-based mortgage-backed securities			—				12,780				—				12,780
U.S. Treasury securities			64,804				—				—				64,804
Total securities available-for-sale—fixed maturity			64,804				403,215				—				468,019
Equity securities:
Domestic common stock			14,789				—				2				14,791
Total		$	79,593			$	403,215			$	2			$	482,810

At December 31, 2017, assets measured at fair value on a recurring basis are summarized below:

		December 31, 2017
		Level 1 Inputs				Level 2 Inputs				Level 3 Inputs				Total Fair Value
		(in thousands)
Financial instruments carried at fair value, classified as part of:
Securities available-for-sale—fixed maturity:
States and political subdivisions		$	—			$	251,140			$	—			$	251,140
Corporate bonds			—				130,222				—				130,222
U.S. agency-based mortgage-backed securities			—				18,014				—				18,014
U.S. Treasury securities and obligations    of U.S. government agencies			66,218				—				—				66,218
Total securities available-for-sale—fixed maturity		$	66,218			$	399,376			$	—			$	465,594
Securities available-for-sale—Equity:
Domestic common stock			9,248				—				34				9,282
Total available-for-sale		$	75,466			$	399,376			$	34			$	474,876

Schedule of Assets Measured at Amortized Cost

At September 30, 2018, assets measured at amortized cost are summarized below:

		September 30, 2018
		Level 1 Inputs				Level 2 Inputs				Level 3 Inputs				Total Fair Value
		(in thousands)
Securities held-to-maturity—fixed maturity:
States and political subdivisions		$	—			$	428,688			$	—			$	428,688
Corporate bonds			—				94,861				—				94,861
U.S. agency-based mortgage-backed securities			—				8,807				—				8,807
U.S. Treasury securities			7,057				—				—				7,057
Obligations of U.S. government agencies			—				59,354				—				59,354
Asset-backed securities			—				1,118				—				1,118
Total held-to-maturity		$	7,057			$	592,828			$	—			$	599,885

At December 31, 2017, assets measured at amortized cost are summarized below:

		December 31, 2017
		Level 1 Inputs				Level 2 Inputs				Level 3 Inputs				Total Fair Value
		(in thousands)
Securities held-to-maturity—fixed maturity:
States and political subdivisions		$	—			$	469,101			$	—			$	469,101
Corporate bonds			—				100,047				—				100,047
U.S. agency-based mortgage-backed securities			—				10,845				—				10,845
U.S. Treasury securities			6,750				—				—				6,750
Obligations of U.S. government agencies			—				51,257				—				51,257
Asset-backed securities			—				1,309				—				1,309
Total held-to-maturity		$	6,750			$	632,559			$	—			$	639,309

Summary of Information Regarding Changes in Fair Value of Assets Measured at Fair Value

The following table presents summary information regarding changes in the fair value of assets measured at fair value using Level 3 input.

		Nine Months Ended				Twelve Months Ended
		September 30, 2018				December 31, 2017
		(in thousands)
Balance, beginning of period		$	34			$	—
Transfer into Level 3			—				34
Unrealized loss on equity security			(32	)			—
Balance, end of period		$	2			$	34

Summary of Carrying Values and Corresponding Fair Values for Financial Instruments

The following table summarizes the carrying values and corresponding fair values for financial instruments:

		As of  September 30, 2018								As of  December 31, 2017
		Carrying Amount				Fair Value				Carrying Amount				Fair Value
		(in thousands)
Assets:
Fixed maturity securities—held-to-maturity		$	602,830			$	599,885			$	629,668			$	639,309
Fixed maturity securities—available-for-sale			468,019				468,019				465,594				465,594
Equity securities			14,791				14,791				9,282				9,282
Short-term investments			104,896				104,896				25,770				25,770
Cash and cash equivalents			33,324				33,324				55,559				55,559

X

- Definition

Fair value schedule of assets carried at amortized cost.

+ References

No definition available.

+ Details

Name:	amsf_HeldToMaturitySecuritiesTableTextBlock
Namespace Prefix:	amsf_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueByBalanceSheetGroupingTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

+ Details

Name:	us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration