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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Deposits, by Component, Alternative [Abstract]    
Noninterest-bearing demand deposit $ 1,110,738 $ 969,525
Interest-bearing saving and demand deposits 2,285,357 2,274,116
Individual Retirement Account 208,807 231,376
Retail certificates of deposists 601,687 595,983
Institutional certificates of deposits 212,187 209,951
Total Core Deposits 4,418,776 4,280,951
Brokered Deposists 461,425 518,531
Deposits, Total $ 4,880,201 $ 4,799,482