The Tidemark Federal Credit Union is a mortgage from Tidemark Federal Credit Union. The ongoing APR is 10/1 ARM, 20 years: interest rate as low as 7.250%, APR 7.324% (rates as of October 17, 2026). Typical credit limit: Minimum loan amount $50,000. Maximum Loan amount $600,000, 80% Loan to Value. Loan terms: 20 Years.