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Investments (Held-To-Maturity Securities Disclosure) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortized Cost $ 42,150 $ 101,397
Net Unrealized Gains (Losses) (21) 159
Total HTM fixed income securities carrying value 42,129 101,556
Unrecognized Holding Gains 2,026 3,813
Unrecognized Holding Losses (55) (158)
Total HTM fixed income securities fair value 44,100 105,211
Obligations of States and Political Subdivisions [Member]    
Amortized Cost 25,154 77,466
Net Unrealized Gains (Losses) 84 317
Total HTM fixed income securities carrying value 25,238 77,783
Unrecognized Holding Gains 1,023 2,133
Unrecognized Holding Losses 0 0
Total HTM fixed income securities fair value 26,261 79,916
Corporate Securities [Member]    
Amortized Cost 16,996 22,711
Net Unrealized Gains (Losses) (105) (143)
Total HTM fixed income securities carrying value 16,891 22,568
Unrecognized Holding Gains 1,003 1,665
Unrecognized Holding Losses (55) (158)
Total HTM fixed income securities fair value $ 17,839 24,075
Commercial Mortgage Backed Securities [Member]    
Amortized Cost   1,220
Net Unrealized Gains (Losses)   (15)
Total HTM fixed income securities carrying value   1,205
Unrecognized Holding Gains   15
Unrecognized Holding Losses   0
Total HTM fixed income securities fair value   $ 1,220