Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2017

Other Comprehensive Income (Loss), Tax [Abstract]

Schedule of components of other comprehensive income

The following tables summarize the accumulated balances related to each component of other comprehensive income (loss) for three months ended September 30, 2016 and 2017:

			Accumulated
	Unrealized Net		Other
	Gains (Losses)		Comprehensive
	on Securities		Gains (Losses)
Balance at June 30, 2016	$	96,246	$	96,246
Unrealized loss		(65,901)		(65,901)
Net amount reclassified to net loss		1,295		1,295
Other comprehensive loss		(64,606)		(64,606)
Balance at September 30, 2016	$	31,640	$	31,640

			Accumulated
	Unrealized Net		Other
	Gains (Losses)		Comprehensive
	on Securities		Gains (Losses)
Balance at June 30, 2017	$	(34,863)	$	(34,863)
Unrealized gain		30,303		30,303
Net amount reclassified to net loss		—		—
Other comprehensive income		30,303		30,303
Balance at September 30, 2017	$	(4,560)	$	(4,560)

The following tables summarize the accumulated balances related to each component of other comprehensive income for the nine months ended September 30, 2016 and 2017:

			Accumulated
	Unrealized Net		Other
	Gains (Losses)		Comprehensive
	on Securities		Gains (Losses)
Balance at December 31, 2015	$	(79,399)	$	(79,399)
Unrealized gain		109,744		109,744
Net amount reclassified to net loss		1,295		1,295
Other comprehensive income		111,039		111,039
Balance at September 30, 2016	$	31,640	$	31,640

			Accumulated
	Unrealized Net		Other
	Gains (Losses)		Comprehensive
	on Securities		Gains (Losses)
Balance at December 31, 2016	$	(41,196)	$	(41,196)
Unrealized gain		36,636		36,636
Net amount reclassified to net loss		—		—
Other comprehensive income		36,636		36,636
Balance at September 30, 2017	$	(4,560)	$	(4,560)