Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2018

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 loss for the three months ended March 31, 2017 and 2018:

			Accumulated
	Unrealized Net		Other
	Losses		Comprehensive
	on Securities		Losses
Balance at December 31, 2016	$	(41,196)	$	(41,196)
Unrealized loss		(12,681)		(12,681)
Other comprehensive loss		(12,681)		(12,681)
Balance at March 31, 2017	$	(53,877)	$	(53,877)

			Accumulated
	Unrealized Net		Other
	Losses		Comprehensive
	on Securities		Losses
Balance at December 31, 2017	$	(64,433)	$	(64,433)
Unrealized loss		(14,710)		(14,710)
Other comprehensive loss		(14,710)		(14,710)
Balance at March 31, 2018	$	(79,143)	$	(79,143)