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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2019
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 three months March 31, 2019 and 2018.
| For the three months ended March 31,
| 2019 | 2018
Balance at beginning of period | $ | (5,051,000 | ) | $ | (2,901,000 | )
Unrealized gains (losses) arising during the period | 4,446,000 |  | (4,052,000 | )
Reclassification of realized gains during the period | — |  | (136,000 | )
Related deferred taxes | (934,000 | ) | 879,000 |
Net change | 3,512,000 |  | (3,309,000 | )
Balance at end of period | $ | (1,539,000 | ) | $ | (6,210,000 | )
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 three months March 31, 2019 and 2018.
| For the three months ended March 31,
| 2019 | 2018
Balance at beginning of period | $ | (197,000 | ) | $ | (174,000 | )
Amortization of net unrealized gains (losses) | 4,000 |  | (10,000 | )
Related deferred taxes | (1,000 | ) | 2,000 |
Net change | 3,000 |  | (8,000 | )
Balance at end of period | $ | (194,000 | ) | $ | (182,000 | )
The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the three months March 31, 2019 and 2018.
| For the three months ended March 31,
| 2019 | 2018
Balance at beginning of period | $ | 1,438,000 |  | $ | 1,544,000 |
Unrealized gains (losses) on cash flow hedging derivatives arising during the period | (589,000 | ) | 486,000 |
Related deferred taxes | 124,000 |  | (102,000 | )
Net change | (465,000 | ) | 384,000 |
Balance at end of period | $ | 973,000 |  | $ | 1,928,000 |
The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the three months March 31, 2019 and 2018.
| For the three months ended March 31,
| 2019 | 2018
Unrecognized postretirement benefits at beginning of period | $ | 37,000 |  | $ | (147,000 | )
Amortization of unrecognized transition obligation | — |  | — |
Change in unamortized net actuarial gain (loss) | — |  | — |
Related deferred taxes | — |  | — |
Unrecognized postretirement benefits at end of period | $ | 37,000 |  | $ | (147,000 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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