v3.21.2
Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2021
Nov. 03, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2021  
Document Transition Report false  
Entity File Number 001-36461  
Entity Registrant Name FIRST FOUNDATION INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-8639702  
Entity Address, Address Line One 200 Crescent Court  
Entity Address, Address Line Two Suite 1400  
Entity Address, City or Town Dallas  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 75201  
City Area Code 469  
Local Phone Number 638-9636  
Title of 12(b) Security Common Stock  
Trading Symbol FFWM  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   45,070,936
Amendment Flag false  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001413837