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Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 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 nine months and quarter ended September 30, 2021 and 2020.
For the nine months ended September 30,For the quarter ended September 30,
2021202020212020
Balance at beginning of period$5,009,000 $3,657,000 $1,190,000 $7,100,000 
Unrealized gains (losses) arising during the period(7,112,000)3,537,000 (2,442,000)(2,000,000)
Reclassification of net realized (gains) losses during the period(22,000)(1,179,000)142,000 — 
Related deferred taxes1,498,000 (495,000)483,000 420,000 
Net change(5,636,000)1,863,000 (1,817,000)(1,580,000)
Balance at end of period$(627,000)$5,520,000 $(627,000)$5,520,000 
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 nine months and quarter ended September 30, 2021 and 2020.
For the nine months ended September 30,For the quarter ended September 30,
2021202020212020
Balance at beginning of period$(133,000)$(182,000)$(113,000)$(146,000)
Amortization of net unrealized gains43,000 54,000 18,000 9,000 
Related deferred taxes(9,000)(11,000)(4,000)(2,000)
Net change34,000 43,000 14,000 7,000 
Balance at end of period$(99,000)$(139,000)$(99,000)$(139,000)

The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the nine months and quarter ended September 30, 2021 and 2020.
For the nine months ended September 30,For the quarter ended September 30,
2021202020212020
Balance at beginning of period$(4,932,000)$97,000 $(2,083,000)$(6,187,000)
Unrealized gains (losses) on cash flow hedging derivatives arising during the period4,297,000 (7,465,000)691,000 490,000 
Related deferred taxes(902,000)1,568,000 (145,000)(103,000)
Net change3,395,000 (5,897,000)546,000 387,000 
Balance at end of period$(1,537,000)$(5,800,000)$(1,537,000)$(5,800,000)
There was no activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the nine months and quarter ended September 30, 2021 and 2020.