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Deposits and Related Interest (Maturities of Time Deposits) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Maturities of Time Deposits [Abstract]    
Time Deposit Maturities Less Than Three Month $ 318,599 $ 316,382
Time Deposit Maturities Three To Twelve Month 462,655 508,285
Total Time deposits 781,254 824,667
Time Deposit Maturities, Year Two 462,528 470,670
Time Deposit Maturities, Year Three 121,506 137,016
Time Deposit Maturities, Year Four 36,936 36,125
Time Deposit Maturities, Year Five 37,247 38,623
Certificates of deposit $ 1,439,471 $ 1,507,101