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Investments (Held-To-Maturity Securities Disclosure) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 41,620 $ 42,150
Net Unrealized Gains (Losses) (33) (21)
HTM, Carrying Value 41,587 42,129
Unrecognized Holding Gains 1,676 2,026
Unrecognized Holding Losses 0 (55)
Held-to-maturity securities, fair value 43,263 44,100
Obligations of States and Political Subdivisions [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 25,088 25,154
Net Unrealized Gains (Losses) 63 84
HTM, Carrying Value 25,151 25,238
Unrecognized Holding Gains 799 1,023
Unrecognized Holding Losses 0 0
Held-to-maturity securities, fair value 25,950 26,261
Corporate Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 16,532 16,996
Net Unrealized Gains (Losses) (96) (105)
HTM, Carrying Value 16,436 16,891
Unrecognized Holding Gains 877 1,003
Unrecognized Holding Losses 0 (55)
Held-to-maturity securities, fair value $ 17,313 $ 17,839