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INVESTMENT SECURITIES - Equity and other securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Equity and other securities    
Amortized cost $ 82,424 $ 43,917
Gross unrealized gains 918 962
Gross unrealized losses 0 0
Estimated Fair Value 83,342 44,879
Equity securities, at fair value    
Amortized cost 251 251
Gross unrealized gains 168 212
Gross unrealized losses 0 0
Estimated Fair Value 419 463
Held-to-Maturity Portfolio:    
Amortized Cost 1,079,695 0
Unrealized Gains 0 0
Unrealized Losses 44,900 0
Held-to-maturity securities 1,034,795 0
Federal home loan bank common stock    
Other equity securities, at adjusted cost    
Amortized cost 47,497 7,188
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Estimated Fair Value 47,497 7,188
Federal reserve bank common stock    
Other equity securities, at adjusted cost    
Amortized cost 31,144 33,916
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Estimated Fair Value 31,144 33,916
Other equity securities    
Other equity securities, at adjusted cost    
Amortized cost 3,532 2,562
Gross unrealized gains 750 750
Gross unrealized losses 0 0
Estimated Fair Value 4,282 3,312
U.S. Treasury and agency securities    
Equity and other securities    
Securities transferred from available-for-sale to held-to-maturity 1,080,000  
Pretax unrealized losses related to transfer 341,200  
Other equity securities, at adjusted cost    
Gross unrealized losses 417,009 106,057
Held-to-Maturity Portfolio:    
Amortized Cost 1,079,695 0
Unrealized Gains 0 0
Unrealized Losses 44,900 0
Held-to-maturity securities $ 1,034,795 $ 0