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DEPOSITS AND RELATED INTEREST (Deposits by Components) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Deposits and Related Interest [Abstract]    
Non-interest bearing demand deposits $ 2,672,064 $ 2,501,644
Interest-bearing savings and demand deposits 5,089,918 4,880,476
Retail certificates of deposit 902,432 1,007,577
Institutional certificates of deposit 179,337 202,050
Total core deposits 8,843,751 8,591,747
Brokered deposits 11,366 11,371
Total deposits $ 8,855,117 $ 8,603,118