Document and Entity Information - $ / shares		9 Months Ended
	Jul. 31, 2019	Sep. 30, 2019
Registrant CIK		0000038723
Fiscal Year End		--12-31
Registrant Name		1st Franklin Financial Corporation
SEC Form		10-Q
Period End date		Sep. 30, 2019
Tax Identification Number (TIN)		58-0521233
Filer Category		Non-accelerated Filer
Current with reporting		Yes
Interactive Data Current		Yes
Shell Company		false
Small Business		false
Emerging Growth Company		false
Document Quarterly Report		true
Document Transition Report		false
Entity File Number		2-27985
Entity Incorporation, State or Country Code		GA
Entity Address, Address Line One		135 East Tugalo Street
Entity Address, Address Line Two		Post Office Box 880
Entity Address, City or Town		Toccoa
Entity Address, State or Province		GA
Entity Address, Postal Zip Code		30577
City Area Code		706
Local Phone Number		886-7571
Amendment Flag		false
Document Fiscal Year Focus		2019
Document Fiscal Period Focus		Q3
Voting Common Stock
Number of common stock shares outstanding	1,700
Entity Listing, Par Value Per Share	$ 100
Nonvoting Common Stock
Number of common stock shares outstanding	168,300
Entity Listing, Par Value Per Share	$ 0