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Deposits and Related Interest (Maturities of Time Deposits) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Maturities of Time Deposits [Abstract]    
Time Deposit Maturities Less Than Three Month $ 262,406 $ 277,621
Time Deposit Maturities Three To Twelve Month 590,861 534,548
Total Time deposits 853,267 812,169
Time Deposit Maturities, Year Two 444,176 488,440
Time Deposit Maturities, Year Three 195,287 154,545
Time Deposit Maturities, Year Four 38,872 29,701
Time Deposit Maturities, Year Five 35,145 41,949
Certificates of deposit $ 1,566,747 $ 1,526,804