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Deposits and Related Interest (Maturities of Time Deposits) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Maturities of Time Deposits [Abstract]    
Time Deposit Maturities Less Than Three Month $ 305,077 $ 277,621
Time Deposit Maturities Three To Twelve Month 507,127 534,548
Total Time deposits 812,204 812,169
Time Deposit Maturities, Year Two 493,616 488,440
Time Deposit Maturities, Year Three 156,649 154,545
Time Deposit Maturities, Year Four 30,223 29,701
Time Deposit Maturities, Year Five 40,908 41,949
Certificates of deposit $ 1,533,600 $ 1,526,804