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Investments (Held-to-Maturity, Unrealized Losses) (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Schedule of Held-to-maturity Securities [Line Items]  
Less than 12 Months, Fair Value $ 1,145
Less than 12 Months, Gross Unrealized Losses 14
12 Months or Longer, Fair Value 0
12 Months or Longer, Gross Unrealized Losses 0
Total Fair Value 1,145
Total Gross Unrealized Losses $ 14
Total Securities in a Loss Position 1
Mortgage backed securities  
Schedule of Held-to-maturity Securities [Line Items]  
Less than 12 Months, Fair Value $ 1,145
Less than 12 Months, Gross Unrealized Losses 14
12 Months or Longer, Fair Value 0
12 Months or Longer, Gross Unrealized Losses 0
Total Fair Value 1,145
Total Gross Unrealized Losses $ 14
Total Securities in a Loss Position 1