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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Deposits by Component [Abstract]    
Non-interest bearing demand deposit $ 1,712,943 $ 1,675,315
Interest-bearing saving and demand deposits 3,827,602 3,718,846
Retail certificates of deposist 1,759,487 1,781,237
Institutional certificates of deposit 263,725 279,714
Total core deposits 7,563,757 7,455,112
Brokered deposists 255,514 243,498
Total deposits $ 7,819,271 $ 7,698,610