LOAN SALES AND MORTGAGE SERVICING RIGHTS (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
|
| Loan Sales And Mortgage Servicing Rights [Line Items] | |||||
| Gain on sale of loans | $ 18,135 | $ 15,140 | $ 21,459 | $ 15,140 | |
| First Foundation Bank | |||||
| Loan Sales And Mortgage Servicing Rights [Line Items] | |||||
| Sale of multifamily loans through securitization | 580,000 | $ 553,000 | |||
| Gain on sale of loans | 21,500 | 15,100 | |||
| Mortgage servicing rights | 10,700 | 10,700 | 7,900 | ||
| Loans serviced for others | 1,500,000 | 1,500,000 | 1,500,000 | ||
| Valuation allowance of mortgage servicing rights | 3,600 | 3,600 | $ 1,400 | ||
| Valuation provision on mortgage servicing rights | $ 3,100 | 3,100 | |||
| Servicing fees earned on loans | $ 2,300 | $ 300 | |||