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Securities (Financing Receivable Credit Quality Indicators) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Amount $ 205,179 $ 162,987
Standard Poor's, AAA Rating [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amount 204,657 162,336
Standard Poor's, BB Rating [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amount $ 522 $ 651