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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Servicing Asset at Amortized Value, Balance [Roll Forward]      
Servicing Asset at Amortized Cost, Additions, Acquisitions $ 27 $ 63  
Servicing Contracts [Member]      
Morgage Servicing Rights at Amortized Value [Line Items]      
Loans Serviced For Others 2,650,000   $ 2,640,000
Custodial Accounts 3,700   $ 3,800
Servicing Asset at Amortized Value, Balance [Roll Forward]      
Balance, net of valuation allowance, beginning of the period 15,223 14,148  
Additions—amounts capitalized 2,010 1,420  
Amortization [1] (1,853) (1,354)  
Balance, net of valuation allowance, end of the period [2] 15,407 $ 14,277  
Valuation allowance, end of period $ 0    
[1] Amortization of mortgage servicing rights is recorded as a reduction of loan servicing income within mortgage banking operations and any unamortized balance is fully amortized if the loan repays in full.
[2] There was no valuation allowance as of both March 31, 2021 and 2020.