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LOANS - Mortgage Banking (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Servicing loans for participants $ 596,300 $ 497,200
Contractually specified servicing fees 1,300  
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Balance at beginning of year 3,001 3,086
Additions 1,152 160
Amortization (800) (245)
Balance at end of year 3,353 3,001
Total residential loans included in held for sale loans 23,988 6,499
Net gains on sales of loans $ 5,300 $ 493