Commitments and Contingencies - Additional Information (Detail)	Sep. 28, 2022 USD ($) outreachEvent branch loanOfficer	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Commitments to lend additional funds to borrowers		$ 0	$ 0
Lakeland Vs. U.S. Department of Justice
Schedule Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Loss contingency, damages sought, loan subsidy investment, term	5 years
Loss contingency, damages sought, value, loan subsidy investment	$ 12,000,000
Loss contingency, damages sought, annual advertising, community outreach, and credit repair and education, value	750,000
Loss contingency, damages sought, community development contributions, value	$ 400,000
Loss contingency, number of new full-service branches | branch	2
Number of outreach events | outreachEvent	20
Number of additional loan officers | loanOfficer	4
Maximum
Schedule Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Standby letters of credit		30,500,000	20,100,000
Commitments to Extend Credit
Schedule Of Financial Instruments With Off Balance Sheet Credit Risk [Line Items]
Financial instruments with off-balance sheet risks, contract amount		$ 1,660,000,000	$ 1,550,000,000