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Investments (Held-To-Maturity Securities Disclosure) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Amortized Cost $ 101,397 $ 201,054
Net Unrealized Gains (Losses) 159 300
Total HTM fixed income securities carrying value 101,556 201,354
Unrecognized Holding Gains 3,813 8,190
Unrecognized Holding Losses (158) 0
Total HTM fixed income securities fair value 105,211 209,544
Obligations of States and Political Subdivisions [Member]    
Amortized Cost 77,466 175,269
Net Unrealized Gains (Losses) 317 848
Total HTM fixed income securities carrying value 77,783 176,117
Unrecognized Holding Gains 2,133 5,763
Unrecognized Holding Losses 0 0
Total HTM fixed income securities fair value 79,916 181,880
Corporate Securities [Member]    
Amortized Cost 22,711 20,228
Net Unrealized Gains (Losses) (143) (185)
Total HTM fixed income securities carrying value 22,568 20,043
Unrecognized Holding Gains 1,665 1,972
Unrecognized Holding Losses (158) 0
Total HTM fixed income securities fair value 24,075 22,015
Collateralized Loan Obligations and Other Asset-Backed Securities [Member]    
Amortized Cost   1,030
Net Unrealized Gains (Losses)   (120)
Total HTM fixed income securities carrying value   910
Unrecognized Holding Gains   118
Unrecognized Holding Losses   0
Total HTM fixed income securities fair value   1,028
Commercial Mortgage Backed Securities [Member]    
Amortized Cost 1,220 4,527
Net Unrealized Gains (Losses) (15) (243)
Total HTM fixed income securities carrying value 1,205 4,284
Unrecognized Holding Gains 15 337
Unrecognized Holding Losses 0 0
Total HTM fixed income securities fair value $ 1,220 $ 4,621