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Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Other Comprehensive Income (Loss) 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 three months ended March 31, 2021 and 2020.
For the three months ended March 31,
20212020
Balance at beginning of period$5,009,000 $3,657,000 
Unrealized gains (losses) arising during the period(5,945,000)6,109,000 
Reclassification of net realized gains during the period(119,000)(752,000)
Related deferred taxes1,274,000 (1,124,000)
Net change(4,790,000)4,233,000 
Balance at end of period$219,000 $7,890,000 
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 three months ended March 31, 2021 and 2020.
For the three months ended March 31,
20212020
Balance at beginning of period$(133,000)$(182,000)
Amortization of net unrealized gains11,000 10,000 
Related deferred taxes(2,000)(2,000)
Net change9,000 8,000 
Balance at end of period$(124,000)$(174,000)

The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the three months ended March 31, 2021 and 2020.
For the three months ended March 31,
20212020
Balance at beginning of period$(4,932,000)$97,000 
Unrealized gains (losses) on cash flow hedging derivatives arising during the period4,390,000 (6,165,000)
Related deferred taxes(921,000)1,295,000 
Net change3,469,000 (4,870,000)
Balance at end of period$(1,463,000)$(4,773,000)
The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the three months ended March 31, 2021 and 2020.
For the three months ended March 31,
20212020
Unrecognized postretirement benefits at beginning of period$28,000 $24,000 
Amortization of unrecognized transition obligation— — 
Change in unamortized net actuarial gain (loss)— — 
Related deferred taxes— — 
Unrecognized postretirement benefits at end of period$28,000 $24,000