Other Comprehensive Income (Loss)

The following table summarizes activity in the unrealized gain or loss on available for sale securities included in other comprehensive income (loss) for the years ended December 31, 2017, 2016 and 2015.



For the years ended December 31,	2017			2016			2015
Balance at beginning of year	$	(935,000	)	$	1,123,000		$	2,522,000
Unrealized losses arising during the year	(1,763,000		)	(2,493,000		)	(754,000		)
Reclassification of realized gains during the year	(471,000		)	(673,000		)	(1,399,000		)
Related deferred taxes	782,000			1,108,000			754,000
Reclassification adjustment for effect of enacted tax law changes	(514,000		)	—			—
Net change	(1,966,000		)	(2,058,000		)	(1,399,000		)
Balance at end of year	$	(2,901,000	)	$	(935,000	)	$	1,123,000

The reclassification of realized gains is included in the net securities gains line of the consolidated statements of income and comprehensive income and the tax effect is included in the income tax expense line of the same statement.

The following table summarizes activity in the unrealized loss on securities transferred from available for sale to held to maturity included in other comprehensive income (loss) for the years ended December 31, 2017, 2016, and 2015.



For the years ended December 31,	2017			2016			2015
Balance at beginning of year	$	(129,000	)	$	(112,000	)	$	(48,000	)
Amortization of net unrealized losses	(22,000		)	(26,000		)	(98,000		)
Related deferred taxes	8,000			9,000			34,000
Reclassification adjustment for effect of enacted tax law changes	(31,000		)	—			—
Net change	(45,000		)	(17,000		)	(64,000		)
Balance at end of year	$	(174,000	)	$	(129,000	)	$	(112,000	)

The following table represents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the years ended December 31, 2017, 2016, and 2015.



For the years ended December 31,	2017			2016			2015
Balance at beginning of year	$	1,163,000		$	—		$	—
Unrealized gains on cash flow hedging derivatives arising during the year	165,000			1,790,000			—
Related deferred taxes	(58,000		)	(627,000		)	—
Reclassification adjustment for effect of enacted tax law changes	274,000			—			—
Net change	381,000			1,163,000			—
Balance at end of year	$	1,544,000		$	1,163,000		$	—

The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the years ended December 31, 2017, 2016, and 2015:



For the years ended December 31,	2017			2016			2015
Unrecognized postretirement benefits at beginning of year	$	(102,000	)	$	(156,000	)	$	(125,000	)
Change in unamortized net actuarial loss	(30,000		)	84,000			(48,000		)
Related deferred taxes	11,000			(30,000		)	17,000
Reclassification adjustment for effect of enacted tax law changes	(26,000		)	$	—		$	—
Net change	(45,000		)	$	54,000		$	(31,000	)
Unrecognized postretirement benefits at end of year	$	(147,000	)	$	(102,000	)	$	(156,000	)

The reclassification of accumulated losses is a component of net periodic benefit cost (see Note 12) and the income tax effect is included in the income tax expense line of the consolidated statements of income and comprehensive income.