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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deposits, by Component, Alternative [Abstract]    
Noninterest-bearing demand deposit $ 848,502 $ 762,009
Interest-bearing saving and demand deposits 2,219,452 2,208,180
Individual Retirement Account 265,754 268,799
Retail certificates of deposists 563,965 441,998
Institutional certificates of deposits 190,419 253,791
Total Core Deposits 4,088,092 3,934,777
Brokered Deposists 576,395 782,974
Deposits, Total $ 4,664,487 $ 4,717,751