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DEPOSITS DEPOSITS (Maturities and Weighted Average Interest Rates of Certificates of Deposit) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Maturities of Time Deposits [Abstract]    
Maturing in one year or less $ 705,004  
Maturing after one year through two years 116,565  
Maturing after two years through three years 61,618  
Maturing after three years through four years 13,244  
Maturing after four years through five years 8,684  
Maturing after five years 1,863  
Total certificates of deposit [1] $ 906,978 $ 915,320
Weighted Average Rate [Abstract]    
Maturing in one year or less 0.71%  
Maturing after one year through two years 1.29%  
Maturing after two years through three years 0.81%  
Maturing after three years through four years 1.89%  
Maturing after four years through five years 0.72%  
Maturing after five years 0.95%  
Total certificates of deposit 0.81%  
[1] Certificates of deposit include $34,000 and $58,000 of acquisition premiums at March 31, 2021 and December 31, 2020, respectively.