v3.26.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 16, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Documents Incorporated by Reference [Text Block]

Portions of the registrant’s definitive Proxy Statement to be used in connection with its 2026 Annual Meeting of Shareholders, which is expected to be filed with the Securities and Exchange Commission within 120 days after the close of the fiscal year covered by this Form 10-K, are incorporated by reference into Part III of this report.

    
Entity Information [Line Items]      
Entity Registrant Name TEXAS REPUBLIC CAPITAL CORPORATION    
Entity Central Index Key 0001560452    
Entity File Number 000-55621    
Entity Tax Identification Number 45-5311713    
Entity Incorporation, State or Country Code TX    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Public Float     $ 0
Entity Contact Personnel [Line Items]      
Entity Address, Address Line One 13215 Bee Cave Parkway, Ste A120    
Entity Address, City or Town Austin    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 78738    
Entity Phone Fax Numbers [Line Items]      
City Area Code 512    
Local Phone Number 330-0099    
Entity Listings [Line Items]      
Title of 12(g) Security Common Stock, $.01 Par Value    
Entity Common Stock, Shares Outstanding   16,140,570