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SECURITIES (Gross realized gain (loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales $ 423,415 $ 182,749 $ 630,481 $ 511,639
Gross security gains 3,844 3,958 4,289 6,862
Gross security losses $ 1,002 $ 1,952 $ 1,477 $ 3,198