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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Deposits and Related Interest [Abstract]    
Non-interest bearing demand deposit $ 2,216,306 $ 1,675,315
Interest-bearing saving and demand deposits 4,132,228 3,718,846
Retail certificates of deposist 1,705,236 1,781,237
Institutional certificates of deposit 269,990 279,714
Total core deposits 8,323,760 7,455,112
Brokered deposists 218,166 243,498
Total deposits $ 8,541,926 $ 7,698,610