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INVESTMENT SECURITIES (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
security
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
security
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
security
Class of Stock [Line Items]          
Proceeds from sales of investment securities available-for-sale $ 175,000 $ 0 $ 174,971 $ 0  
Investment securities pledged as collateral $ 518,600   $ 518,600   $ 483,600
Number of investment securities in an unrealized loss position | security 100   100   37
Common Class B | Visa          
Class of Stock [Line Items]          
Shares owned (in shares) | shares 34,631   34,631