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Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Schedule of Accumulated 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 six months and quarter ended June 30, 2021 and 2020.
For the six months ended June 30,For the quarter ended June 30,
2021202020212020
Balance at beginning of period$5,009,000 $3,657,000 $1,556,000 $7,890,000 
Unrealized gains (losses) arising during the period(4,670,000)5,537,000 (417,000)(572,000)
Reclassification of net realized gains during the period(164,000)(1,179,000)(45,000)(427,000)
Related deferred taxes1,015,000 (915,000)96,000 209,000 
Net change(3,819,000)3,443,000 (366,000)(790,000)
Balance at end of period$1,190,000 $7,100,000 $1,190,000 $7,100,000 
The following table summarizes activity in the unrealized loss on securities transferred from available for sale to held to maturity included in other comprehensive income (loss) for the six months and quarter ended June 30, 2021 and 2020.
For the six months ended June 30,For the quarter ended June 30,
2021202020212020
Balance at beginning of period$(133,000)$(182,000)$(124,000)$(174,000)
Amortization of net unrealized gains25,000 45,000 14,000 35,000 
Related deferred taxes(5,000)(9,000)(3,000)(7,000)
Net change20,000 36,000 11,000 28,000 
Balance at end of period$(113,000)$(146,000)$(113,000)$(146,000)

The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the six months and quarter ended June 30, 2021 and 2020.
For the six months ended June 30,For the quarter ended June 30,
2021202020212020
Balance at beginning of period$(4,932,000)$97,000 $(1,463,000)$(4,773,000)
Unrealized gains (losses) on cash flow hedging derivatives arising during the period3,606,000 (7,955,000)(784,000)(1,790,000)
Related deferred taxes(757,000)1,671,000 164,000 376,000 
Net change2,849,000 (6,284,000)(620,000)(1,414,000)
Balance at end of period$(2,083,000)$(6,187,000)$(2,083,000)$(6,187,000)
The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the six months and quarter ended June 30, 2021 and 2020.
For the six months ended June 30,For the quarter ended June 30,
2021202020212020
Unrecognized postretirement benefits at beginning of period$28,000 $24,000 $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 $28,000 $24,000