Restricted Investments (Details) $ in Thousands			9 Months Ended
		Dec. 31, 2015 USD ($) Securities	Sep. 30, 2016 USD ($) Securities
Restricted Investments [Line Items]
Cost or Amortized Cost	[1]	$ 23,215	$ 22,864
Gross Unrealized Gains		3	1
Gross Unrealized Temporary Losses		(28)	(14)
Estimated Fair Value	[1]	$ 23,190	$ 22,851
Securities with unrealized losses for less than 12 months | Securities		36	44
Maximum [Member]
Restricted Investments [Line Items]
Contractual maturities of fixed maturity securities			1 year
SWFT_Duration of Securities in Unrealized Loss Position		12 months	12 months
United States corporate securities [Member]
Restricted Investments [Line Items]
Cost or Amortized Cost		$ 16,686	$ 16,483
Gross Unrealized Gains		2	1
Gross Unrealized Temporary Losses		(27)	(8)
Estimated Fair Value		16,661	16,476
Municipal bonds [Member]
Restricted Investments [Line Items]
Cost or Amortized Cost		4,904	4,956
Gross Unrealized Gains		1	0
Gross Unrealized Temporary Losses		(1)	(6)
Estimated Fair Value		4,904	4,950
Negotiable certificate of deposits [Member]
Restricted Investments [Line Items]
Cost or Amortized Cost		1,625	1,425
Gross Unrealized Gains		0	0
Gross Unrealized Temporary Losses		0	0
Estimated Fair Value		$ 1,625	$ 1,425

[1] Restricted investments are included in "Restricted investments, held to maturity, amortized cost."