XML 59 R48.htm IDEA: XBRL DOCUMENT v3.21.2

Securities - Schedule of Required Fair Value Disclosures for Equity Securities (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Equity Securities, FV-NI, Realized Gain (Loss) [Roll Forward]
Fair value at beginning of period	$ 2,170	$ 2,363	$ 2,363
Unrealized Gains	393	25	25
Unrealized Losses	16	426	218
Fair value at end of period	2,547	1,962	2,170
CRA Mutual Fund
Equity Securities, FV-NI, Realized Gain (Loss) [Roll Forward]
Fair value at beginning of period	1,065	1,045	1,045
Unrealized Gains	0	25	25
Unrealized Losses	16	0	5
Fair value at end of period	1,049	1,070	1,065
Stock in other banks
Equity Securities, FV-NI, Realized Gain (Loss) [Roll Forward]
Fair value at beginning of period	1,105	1,318	1,318
Unrealized Gains	393	0	0
Unrealized Losses	0	426	213
Fair value at end of period	$ 1,498	$ 892	$ 1,105

X

- Definition

Equity Securities, FV-NI, Realized Gain (Loss) [Roll Forward]

+ References

No definition available.

+ Details

Name:	acnb_EquitySecuritiesFVNIRealizedGainLossRollForward
Namespace Prefix:	acnb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

+ Details

Name:	us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714

+ Details

Name:	us-gaap_EquitySecuritiesFvNiUnrealizedGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714

+ Details

Name:	us-gaap_EquitySecuritiesFvNiUnrealizedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=acnb_CraMutualFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=acnb_StockInOtherBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: