Loans Receivable - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Abstract]
Loans and extensions of credit	$ 7,020	$ 2,586

Loans and leases receivable and extensions of credit.

No definition available.

Name:	lnkb_LoansAndLeasesReceivableAndExtensionsOfCredit
Namespace Prefix:	lnkb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant