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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Deposits, by Component, Alternative [Abstract]    
Noninterest-bearing demand deposit $ 818,153 $ 762,009
Interest-bearing saving and demand deposits 2,312,885 2,208,180
Individual Retirement Account 267,955 268,799
Retail certificates of deposists 549,945 441,998
Institutional certificates of deposits 224,672 253,791
Total Core Deposits 4,173,610 3,934,777
Brokered Deposists 581,161 782,974
Deposits, Total $ 4,754,771 $ 4,717,751