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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deposits, by Component, Alternative [Abstract]    
Noninterest-bearing demand deposit $ 1,105,324 $ 969,525
Interest-bearing saving and demand deposits 2,274,423 2,274,116
Retail certificates of deposists 805,712 827,359
Institutional certificates of deposits 197,559 209,951
Total Core Deposits 4,383,018 4,280,951
Brokered Deposists 525,097 518,531
Deposits, Total $ 4,908,115 $ 4,799,482