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MORTGAGE BANKING ACTIVITIES (Summary of mortgage servicing rights) (Details) - Residential Mortgage [Member] $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) Contracts | Dec. 31, 2020 USD ($) Contracts
Servicing Assets at Fair Value [Line Items] |  |
Number of residential mortgage loans serviced for others | Contracts | 2,028 | 1,796
Outstanding principal balance of residential mortgage loans serviced for others | $ | $ 505,321 | $ 456,135
Weighted average interest rate | 3.62% | 3.64%
Remaining contractual term (in months) | 316 months | 321 months

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