Securities (Schedule of Unrealized Loss on Investments, HTM) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	$ 36,607	$ 77,879
Less than 12 months, unrealized loss	254	1,452
More than 12 months, fair value	45,718	7,143
More than 12 months, unrealized loss	1,182	263
Total, fair value	82,325	85,022
Total, unrealized loss	1,436	1,715
Asset-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	36,607	77,879
Less than 12 months, unrealized loss	254	1,452
More than 12 months, fair value	45,119	6,340
More than 12 months, unrealized loss	1,130	182
Total, fair value	81,726	84,219
Total, unrealized loss	1,384	1,634
Asset-backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
More than 12 months, fair value	599	803
More than 12 months, unrealized loss	52	81
Total, fair value	599	803
Total, unrealized loss	$ 52	$ 81