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DEPOSITS AND RELATED INTEREST (Deposits by Components) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Deposits and Related Interest [Abstract]    
Non-interest bearing demand deposits $ 2,667,508 $ 2,501,644
Interest-bearing savings and demand deposits 5,132,245 4,880,476
Retail certificates of deposit 966,567 1,007,577
Institutional certificates of deposit 200,536 202,050
Total core deposits 8,966,856 8,591,747
Brokered deposits 11,366 11,371
Total deposits $ 8,978,222 $ 8,603,118