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Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2020
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, 2020 and 2019.
For the nine months ended September 30,For the quarter ended September 30,
2020201920202019
Balance at beginning of period$3,657,000 $(5,051,000)$7,100,000 $2,750,000 
Unrealized gains (losses) arising during the period3,537,000 11,074,000 (2,000,000)1,199,000 
Reclassification of net realized gains during the period(1,179,000)(15,000)— (15,000)
Related deferred taxes(495,000)(2,322,000)420,000 (248,000)
Net change1,863,000 8,737,000 (1,580,000)936,000 
Balance at end of period$5,520,000 $3,686,000 $5,520,000 $3,686,000 

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, 2020 and 2019.
For the nine months ended September 30,For the quarter ended September 30,
2020201920202019
Balance at beginning of period$(182,000)$(197,000)$(146,000)$(190,000)
Amortization of net unrealized gains54,000 10,000 9,000 1,000 
Related deferred taxes(11,000)(2,000)(2,000)— 
Net change43,000 8,000 7,000 1,000 
Balance at end of period$(139,000)$(189,000)$(139,000)$(189,000)

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, 2020 and 2019.
For the nine months ended September 30,For the quarter ended September 30,
2020201920202019
Balance at beginning of period$97,000 $1,438,000 $(6,187,000)$75,000 
Unrealized gains (losses) on cash flow hedging derivatives arising during the period(7,465,000)(2,156,000)490,000 (430,000)
Related deferred taxes1,568,000 453,000 (103,000)90,000 
Net change(5,897,000)(1,703,000)387,000 (340,000)
Balance at end of period$(5,800,000)$(265,000)$(5,800,000)$(265,000)
The following table summarizes 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, 2020 and 2019.
For the nine months ended September 30,For the quarter ended September 30,
2020201920202019
Unrecognized postretirement benefits at beginning of period$24,000 $37,000 $24,000 $37,000 
Amortization of unrecognized transition obligation— — — — 
Change in unamortized net actuarial gain (loss)— — — — 
Related deferred taxes— — — — 
Unrecognized postretirement benefits at end of period$24,000 $37,000 $24,000 $37,000