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INVESTMENT SECURITIES (Narrative) (Details)
$ in Thousands
1 Months Ended
May 31, 2022
USD ($)
investment
Mar. 31, 2022
USD ($)
investment
Sep. 30, 2022
USD ($)
security
shares
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
security
Class of Stock [Line Items]          
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   $ 590,880 $ 329,500 $ 0
Net unrealized loss from transfer of securities $ 57,200 $ 32,300      
Available-for-sale debt securities, at fair value     $ 686,681   $ 1,631,699
Number of investment securities in an unrealized loss position | security     256   153
Net proceeds from sale of common stock     $ 412,994   $ 426,091
Collateralized Mortgage-Backed Securities | Asset Pledged as Collateral without Right          
Class of Stock [Line Items]          
Available-for-sale debt securities, at fair value     $ 445,400   $ 455,800
Common Class B | Visa          
Class of Stock [Line Items]          
Shares owned (in shares) | shares     34,631    
Net proceeds from sale of common stock     $ 8,500