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Securities (Schedule of Unrealized Loss on Investments, AFS) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Marketable Securities [Line Items]    
Less than 12 months, fair value $ 0 $ 30,095
Less than 12 months, unrealized loss 0 163
More than 12 months, fair value 32,400 54,846
More than 12 months, unrealized loss 469 2,594
Fair value 32,400 84,941
Unrealized loss 469 2,757
Asset-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Marketable Securities [Line Items]    
Less than 12 months, fair value 0 30,095
Less than 12 months, unrealized loss 0 163
More than 12 months, fair value 32,400 54,846
More than 12 months, unrealized loss 469 2,594
Fair value 32,400 84,941
Unrealized loss $ 469 $ 2,757