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Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2020
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 years ended December 31, 2020, 2019 and 2018.
For the years ended December 31,202020192018
Balance at beginning of year$3,657,000 $(5,051,000)$(2,901,000)
Unrealized gains (losses) arising during the year2,866,000 11,247,000 (2,585,000)
Reclassification of realized gains during the year(1,155,000)(224,000)(137,000)
Related deferred taxes(359,000)(2,315,000)572,000 
Net change1,352,000 8,708,000 (2,150,000)
Balance at end of year$5,009,000 $3,657,000 $(5,051,000)

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, 2020, 2019, and 2018.
For the years ended December 31,202020192018
Balance at beginning of year$(182,000)$(197,000)$(174,000)
Amortization of net unrealized gains (losses)62,000 19,000 (29,000)
Related deferred taxes(13,000)(4,000)6,000 
Net change49,000 15,000 (23,000)
Balance at end of year$(133,000)$(182,000)$(197,000)

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, 2020, 2019, and 2018.
For the years ended December 31,
202020192018
Balance at beginning of year$97,000 $1,438,000 $1,544,000 
Unrealized losses on cash flow hedging derivatives arising during the year(6,366,000)(1,697,000)(134,000)
Related deferred taxes1,337,000 356,000 28,000 
Net change(5,029,000)(1,341,000)(106,000)
Balance at end of year$(4,932,000)$97,000 $1,438,000 

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, 2020, 2019, and 2018:
For the years ended December 31,202020192018
Unrecognized postretirement benefits  at beginning of year$24,000 $37,000 $(147,000)
Change in unamortized net actuarial gain (loss)5,000 (16,000)233,000 
Related deferred taxes(1,000)3,000 (49,000)
Net change4,000 (13,000)184,000 
Unrecognized postretirement benefits at end of year$28,000 $24,000 $37,000