Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loans And Leases, Gross

No definition available.

Name:	lbai_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesGross
Namespace Prefix:	lbai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loans And Leases, Net

+ References

No definition available.

+ Details

Name:	lbai_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesNet
Namespace Prefix:	lbai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Amount at Par Value

+ References

No definition available.

+ Details

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

- Definition

Financing Receivable, Credit Fair Value Adjustment

+ References

No definition available.

+ Details

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

- Definition

Financing Receivable, Interest Rate Fair value Adjustment

+ References

No definition available.

+ Details

Name:	lbai_FinancingReceivableInterestRateFairValueAdjustment
Namespace Prefix:	lbai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 19
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

+ Details

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

- Details

Name:	us-gaap_BusinessAcquisitionAxis=lbai_A1stConstitutionBancorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Acquisitions - Adjustments to Amortized Cost Basis (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 06, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Allowance for credit losses on PCD loans	$ (12,077)	$ 0	$ 0	$ (12,077)	$ 0
1st Constitution Bancorp
Business Acquisition [Line Items]
Gross amortized cost basis	1,110,600
Interest rate fair value adjustment on all loans	3,057
Credit fair value adjustment on non-PCD loans	(6,314)
Fair value of acquired loans at January 6, 2022	1,107,343
Allowance for credit losses on PCD loans	(12,077)
Fair value of acquired loans, net, as of January 6, 2022	$ 1,095,266