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Deposits (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]      
Three months or less $ 180,459 $ 120,238 $ 88,483
More than three months through six months 228,513 151,422 123,789
More than six months through twelve months 208,554 207,141 234,684
Over twelve months 211,983 269,947 292,299
Total $ 829,509 $ 748,748 $ 739,255