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INVESTMENT SECURITIES - Amortized Cost and Fair Value (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Amortized cost          
Within one year $ 1,032   $ 1,032    
After one year through five years 67,779   67,779    
After five years through ten years 123,284   123,284    
After ten years 111,372   111,372    
Mortgage-backed securities 984,293   984,293    
Total available for sale securities 1,287,760   1,287,760   $ 1,012,592
Fair value          
Within one year 1,031   1,031    
After one year through five years 64,894   64,894    
After five years through ten years 114,690   114,690    
After ten years 110,785   110,785    
Mortgage-backed securities 920,690   920,690    
Total available for sale securities 1,212,090   1,212,090   $ 915,895
Proceeds from sales 13,049 $ 65,911 58,874 $ 165,871  
Gross realized gains on sales 113 0 420 338  
Gross realized losses on sales $ (157) $ (4,961) $ (616) $ (6,816)