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INVESTMENT SECURITIES (Narrative) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 15 Months Ended
May 31, 2022
USD ($)
investment
Mar. 31, 2022
USD ($)
investment
Mar. 31, 2023
USD ($)
security
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Jun. 30, 2022
USD ($)
shares
EQUITY              
Investment securities classified from available-for-sale to held-to-maturity | investment 40 41          
Investment securities, amortized cost basis $ 400,900 $ 361,800          
Held to maturity, fair value 343,700 329,500 $ 599,300 $ 329,500 $ 599,300 $ 596,780  
Net unrealized loss from transfer of securities $ 57,200 $ 32,300          
Available-for-sale debt securities, at fair value     $ 687,188   $ 687,188 $ 671,794  
Number of HTM investment securities in an unrealized loss position | security     81   81 83  
Number of AFS investment securities in an unrealized loss position | security     236   236 243  
Net proceeds     $ 405,866   $ 405,866 $ 408,071  
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value     (1,668) $ 0      
Net unrealized gains on investment securities              
EQUITY              
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value     1,668   7,900    
Common Class B | Visa              
EQUITY              
Shares owned (in shares) | shares             34,631
Net proceeds             $ 8,500
Collateralized Mortgage-Backed Securities | Asset Pledged as Collateral without Right              
EQUITY              
Available-for-sale debt securities, at fair value     $ 699,600   $ 699,600 $ 607,700