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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Deposits and Related Interest [Abstract]    
Non-interest bearing demand deposit $ 2,333,489 $ 1,675,315
Interest-bearing saving and demand deposits 4,269,360 3,718,846
Retail certificates of deposist 1,642,779 1,781,237
Institutional certificates of deposit 290,739 279,714
Total core deposits 8,536,367 7,455,112
Brokered deposists 96,090 243,498
Total deposits $ 8,632,457 $ 7,698,610