Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2018

Stockholders' Equity Note [Abstract]

Other Comprehensive Income (Loss)

4. Other Comprehensive Income

The following tables summarize the accumulated balances related to each component of other comprehensive income for the three months ended September 30, 2017 and 2018:

			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
Other comprehensive income		30,303		30,303
Balance at September 30, 2017	$	(4,560)	$	(4,560)

			Accumulated
	Unrealized Net		Other
	Gains (Losses)		Comprehensive
	on Securities		Gains (Losses)
Balance at June 30, 2018	$	(34,324)	$	(34,324)
Unrealized gain		11,640		11,640
Other comprehensive income		11,640		11,640
Balance at September 30, 2018	$	(22,684)	$	(22,684)

The following tables summarize the accumulated balances related to each component of other comprehensive income for the nine months ended September 30, 2017 and 2018:

			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
Other comprehensive income		36,636		36,636
Balance at September 30, 2017	$	(4,560)	$	(4,560)

			Accumulated
	Unrealized Net		Other
	Gains (Losses)		Comprehensive
	on Securities		Gains (Losses)
Balance at December 31, 2017	$	(64,433)	$	(64,433)
Unrealized gain		41,749		41,749
Other comprehensive income		41,749		41,749
Balance at September 30, 2018	$	(22,684)	$	(22,684)