Other Matters (Details) - Lakeland Vs. U.S. Department of Justice $ in Thousands	Sep. 27, 2022 USD ($) security
Loss Contingencies [Line Items]
Loan subsidy investment	$ 12,000
Loan subsidy investment, term	5 years
Community development contributions, value	$ 400
Community development contributions, term	5 years
Annual advertising, community outreach, and credit repair and education, value	$ 150
Annual advertising, community outreach, and credit repair and education, term	5 years
Number of new full-service branches \| security	2

Loss Contingency, Damages Sought, Annual Advertising, Community Outreach, And Credit Repair And Education, Term

No definition available.

Name:	lbai_LossContingencyDamagesSoughtAnnualAdvertisingCommunityOutreachAndCreditRepairAndEducationTerm
Namespace Prefix:	lbai_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingency, Damages Sought, Annual Advertising, Community Outreach, And Credit Repair And Education, Value

+ References

No definition available.

+ Details

Name:	lbai_LossContingencyDamagesSoughtAnnualAdvertisingCommunityOutreachAndCreditRepairAndEducationValue
Namespace Prefix:	lbai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Loss Contingency, Damages Sought, Community Development Contributions, Term

+ References

No definition available.

+ Details

Name:	lbai_LossContingencyDamagesSoughtCommunityDevelopmentContributionsTerm
Namespace Prefix:	lbai_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingency, Damages Sought, Community Development Contributions, Value

+ References

No definition available.

+ Details

Name:	lbai_LossContingencyDamagesSoughtCommunityDevelopmentContributionsValue
Namespace Prefix:	lbai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Loss Contingency, Damages Sought, Loan Subsidy Investment, Term

+ References

No definition available.

+ Details

Name:	lbai_LossContingencyDamagesSoughtLoanSubsidyInvestmentTerm
Namespace Prefix:	lbai_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingency, Damages Sought, Value, Loan Subsidy Investment

+ References

No definition available.

+ Details

Name:	lbai_LossContingencyDamagesSoughtValueLoanSubsidyInvestment
Namespace Prefix:	lbai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Loss Contingency, Number Of New Full-Service Branches

+ References

No definition available.

+ Details

Name:	lbai_LossContingencyNumberOfNewFullServiceBranches
Namespace Prefix:	lbai_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	srt_LitigationCaseAxis=lbai_LakelandVsUSDepartmentOfJusticeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: