to I.C. § 6-303(2) a tenant “is guilty of an unlawful detainer ... [w]here he continues in possession ... without permission of his landlord ... after default in the payment of rent, pursuant to the lease or agreement under which the property is held, and three (3) days’ notice, in writing, requiring its payment, stating the amount which is due, or possession of the property, shall have been served upon him ...” However: [T]he remedy of forfeiture permitted under our unlawful detainer statutes, I.C. §§ 6-303, -316, is merely cumulative to any contractual right of reentry provided for in the lease agreement. See Hunter v. Porter, 10 Idaho 72, 78-80, 77 P. 434, 436 (1904); 3A Thompson on Real Property § 1370 (1981); 50 Am.Jur.2d, Landlord & Tenant § 1227 (19970); cf. I.C. § 55-210 (<HOLDING>). Riverside Development Co. v. Ritchie, 103
recognizing lessors contractual right of reentry upon three days notice holding that a difference between 384 days prepreference average number of days to payment and 547 days preference average number of days to payment did not make the payments out of the ordinary course of business holding that delays of 115 days and 101 days were both substantial holding that 120 days notice was satisfied by 30 days work plus 90 days pay holding 57 days notice before deadline to file a complaint under  523 was sufficient notice when creditor had actual notice of filing