Fair Value Measurement - Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Held to Maturity (Details) - Perfect Home Bonds - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 22,334	$ 21,311
Fair Value	$ 22,334	$ 21,311

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant