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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Deposits, by Component, Alternative [Abstract]    
Noninterest-bearing demand deposit $ 845,375 $ 848,502
Interest-bearing saving and demand deposits 2,115,290 2,219,452
Individual Retirement Account 238,345 265,754
Retail certificates of deposists 607,910 563,965
Institutional certificates of deposits 206,855 190,419
Total Core Deposits 4,013,775 4,088,092
Brokered Deposists 568,911 576,395
Deposits, Total $ 4,582,686 $ 4,664,487