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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Deposits, by Component, Alternative [Abstract]    
Noninterest-bearing demand deposit $ 917,260 $ 762,009
Interest-bearing saving and demand deposits 2,165,907 2,208,180
Individual Retirement Account 269,189 268,799
Retail certificates of deposists 525,979 441,998
Institutional certificates of deposits 204,074 253,791
Total Core Deposits 4,082,409 3,934,777
Brokered Deposists 561,645 782,974
Deposits, Total $ 4,644,054 $ 4,717,751