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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Mar. 07, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-15369    
Entity Registrant Name WILLIS LEASE FINANCE CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 68-0070656    
Entity Address, Address Line One 4700 Lyons TechnologyParkway    
Entity Address, City or Town Coconut Creek    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33073    
City Area Code 561    
Local Phone Number 349-9989    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol WLFC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 114.3
Entity Common Stock, Shares Outstanding   6,124,884  
Documents Incorporated by Reference None.    
Entity Central Index Key 0001018164    
Amendment Flag true    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Description This Amendment No. 1 on Form 10-K/A supplements our annual report on Form 10-K for the year ended December 31, 2022, which we filed with the Securities and Exchange Commission (“SEC”) on March 10, 2023 (the “Original Filing”). We are filing this amendment to provide the information required by Items 10, 11, 12, 13 and 14 of Part III of Form 10-K. In addition, we have filed the following exhibits herewith:     •   31.3 Rule 13a-14(a)/15d-15(a) certification of the Chief Executive Officer; and     •   31.4 Rule 13a-14(a)/15d-15(a) certification of the Chief Financial Officer. Except as described above, no other amendments are being made to our annual report on Form 10-K filed on March 10, 2023.