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INVESTMENT SECURITIES - Equity and other securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Equity and Other Securities    
Amortized Cost $ 66,006 $ 82,424
Gross Unrealized Gains 819 918
Gross Unrealized Losses 0 0
Equity and other securities 66,825 83,342
Equity Securities, at Fair Value    
Amortized Cost 251 251
Gross Unrealized Gains 69 168
Gross Unrealized Losses 0 0
Fair Value 320 419
Held-to-Maturity Portfolio:    
Amortized Cost 1,125,540  
Gross Unrealized Gains 0 0
Gross Unrealized Losses 134,880 44,900
Fair Value 990,660 1,034,795
Federal Home Loan Bank Common Stock    
Equity and Other Securities    
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Equity and other securities 26,524 47,497
Other Equity Securities, at Adjusted Cost    
Amortized Cost 26,524 47,497
Federal Reserve Bank Common Stock    
Equity and Other Securities    
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Equity and other securities 33,568 31,144
Other Equity Securities, at Adjusted Cost    
Amortized Cost 33,568 31,144
Other Equity Securities    
Equity and Other Securities    
Gross Unrealized Gains 750 750
Gross Unrealized Losses 0 0
Equity and other securities 6,413 4,282
Other Equity Securities, at Adjusted Cost    
Amortized Cost 5,663 3,532
U.S. Treasury and agency securities    
Held-to-Maturity Portfolio:    
Gross Unrealized Gains 0 0
Gross Unrealized Losses 134,091 44,900
Fair Value $ 967,588 $ 1,034,795