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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deposits, by Component, Alternative [Abstract]    
Noninterest-bearing demand deposit $ 761,117 $ 745,142
Interest-bearing saving and demand deposits 2,208,180 2,544,665
Individual Retirement Account 268,799 303,049
Retail certificates of deposists 441,998 452,150
Institutional certificates of deposits 253,791 260,090
Total Core Deposits 3,933,885 4,305,096
Brokered Deposists 782,974 619,310
Deposits, Total $ 4,716,859 $ 4,924,406