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Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2023
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 OCI for the nine months and quarters ended September 30, 2023 and 2022.
For the nine months ended September 30,For the quarter ended September 30,
2023202220232022
Balance at beginning of period$(44,718,000)$(1,718,000)$(43,781,000)$(32,795,000)
Unrealized losses arising during the period(11,562,000)(58,149,000)(12,748,000)(18,812,000)
Reclassification of net realized gains during the period— (7,000)— (6,000)
Related deferred taxes2,428,000 12,213,000 2,677,000 3,952,000 
Net change(9,134,000)(45,943,000)(10,071,000)(14,866,000)
Balance at end of period$(53,852,000)$(47,661,000)$(53,852,000)$(47,661,000)
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 OCI for the nine months and quarters ended September 30, 2023 and 2022.
For the nine months ended September 30,For the quarter ended September 30,
2023202220232022
Balance at beginning of period$(64,000)$(87,000)$(59,000)$(73,000)
Amortization of net unrealized gains7,000 25,000 1,000 7,000 
Related deferred taxes(1,000)(5,000)— (1,000)
Net change6,000 20,000 1,000 6,000 
Balance at end of period$(58,000)$(67,000)$(58,000)$(67,000)

The following table presents the effect of the Company's derivative financial instruments included in OCI for the nine months and quarters ended September 30, 2023 and 2022.
For the nine months ended September 30,For the quarter ended September 30,
2023202220232022
Balance at beginning of period$544,000 $— $680,000 $146,000 
Unrealized gains on cash flow hedging derivatives arising during the period1,096,000 633,000 924,000 448,000 
Related deferred taxes(230,000)(133,000)(194,000)(94,000)
Net change866,000 500,000 730,000 354,000 
Balance at end of period$1,410,000 $500,000 $1,410,000 $500,000 
There was no activity in the unrealized gain or loss on postretirement benefits included in OCI for the nine months and quarters ended September 30, 2023 and 2022.