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SECURITIES: (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Rollforward of the credit losses recognized in earnings      
Beginning balance, January 1, $ 2,974 $ 7,132 $ 13,974
Reductions for securities called during the period 0 (4,158) (6,842)
Ending balance, December 31, $ 2,974 $ 2,974 $ 7,132