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INVESTMENT SECURITIES (Narrative) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 15 Months Ended
May 31, 2022
USD ($)
investment
Mar. 31, 2022
USD ($)
investment
Jun. 30, 2023
USD ($)
security
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2023
USD ($)
security
Jun. 30, 2022
USD ($)
shares
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
security
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 debt securities, fair value 343,700 329,500 $ 581,222   $ 581,222     $ 596,780
Net unrealized loss from transfer of securities $ 57,200 $ 32,300            
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value         3,644 $ 1,976    
Fair Value     $ 664,071   $ 664,071     $ 671,794
Number of HTM investment securities in an unrealized loss position | security     83   83     83
Number of AFS investment securities in an unrealized loss position | security     245   245     243
Net proceeds     $ 405,511   $ 405,511     $ 408,071
Proceeds from Sale and Maturity of Marketable Securities     0   0      
Common Class B | Visa                
EQUITY                
Shares owned (in shares) | shares       34,631   34,631    
Net proceeds       $ 8,500   $ 8,500    
Collateralized Mortgage-Backed Securities | Asset Pledged as Collateral without Right                
EQUITY                
Fair Value     841,900   841,900     $ 607,700
Net unrealized gains on investment securities                
EQUITY                
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value     $ (1,976) $ (1,976) $ (3,644) $ (1,976) $ (9,900)