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INVESTMENT SECURITIES (Narrative) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
security
investment
shares
Dec. 31, 2021
USD ($)
security
Class of Stock [Line Items]    
Investment securities classified from available-for-sale to held-to-maturity | investment 41  
Investment securities, amortized cost basis $ 361,800  
Held to maturity, fair value 329,503 $ 0
Net unrealized loss from transfer of securities 32,300  
Investment securities pledged as collateral $ 408,300 $ 455,800
Number of investment securities in an unrealized loss position | security 273 153
Common Class B | Visa    
Class of Stock [Line Items]    
Shares owned (in shares) | shares 34,631