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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deposits by Component [Abstract]    
Non-interest bearing demand deposit $ 1,675,315 $ 1,105,324
Interest-bearing saving and demand deposits 3,718,846 2,274,423
Retail certificates of deposist 1,781,237 805,712
Institutional certificates of deposit 279,714 197,559
Total core deposits 7,455,112 4,383,018
Brokered deposists 243,498 525,097
Total deposits $ 7,698,610 $ 4,908,115