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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deposits, by Component, Alternative [Abstract]    
Noninterest-bearing demand deposit $ 969,525 $ 848,502
Interest-bearing saving and demand deposits 2,274,116 2,219,452
Individual Retirement Account 231,376 265,754
Retail certificates of deposists 595,983 563,965
Institutional certificates of deposits 209,951 190,419
Total Core Deposits 4,280,951 4,088,092
Brokered Deposists 518,531 576,395
Deposits, Total $ 4,799,482 $ 4,664,487