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MORTGAGE HEDGING ACTIVITIES - Summary of Derivative Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Fair Value $ 3,638 $ 3,447
IRLCs    
Derivative [Line Items]    
Fair Value 1,998 5,294
Notional Amount 245,217 260,954
MBSs    
Derivative [Line Items]    
Fair Value 1,640 (1,847)
Notional Amount $ 328,000 $ 376,000