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Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2024
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 three months ended March 31, 2024 and 2023.
For the three months ended March 31,
20242023
Balance at beginning of period$(39,575,000)$(44,718,000)
Unrealized (losses) gains arising during the period(4,102,000)5,292,000 
Related deferred taxes861,000 (1,111,000)
Net change(3,241,000)4,181,000 
Balance at end of period$(42,816,000)$(40,537,000)
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 three months ended March 31, 2024 and 2023.
For the three months ended March 31,
20242023
Balance at beginning of period$(56,000)$(64,000)
Amortization of net unrealized gains3,000 5,000 
Related deferred taxes(1,000)(1,000)
Net change2,000 4,000 
Balance at end of period$(54,000)$(60,000)

The following table presents the effect of the Company's derivative financial instruments included in OCI for the three months ended March 31, 2024 and 2023.
For the three months ended March 31,
20242023
Balance at beginning of period$300,000 $544,000 
Unrealized gains (losses) on cash flow hedging derivatives arising during the period551,000 (3,463,000)
Related deferred taxes(116,000)727,000 
Net change435,000 (2,736,000)
Balance at end of period$735,000 $(2,192,000)
There was no activity in the unrealized gain or loss on postretirement benefits included in OCI for the three months ended March 31, 2024 and 2023.