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Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2016
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 other comprehensive income (loss) for the years ended December 31, 2016, 2015 and 2014.
For the years ended December 31, | 2016 |  | 2015 |  | 2014
Balance at beginning of year | $ | 1,123,000 |  |  | $ | 2,522,000 |  |  | $ | (6,591,000 | )
Unrealized gains (losses) arising during the year | (2,493,000 | ) |  | (754,000 | ) |  | 15,175,000 |
Realized gains during the year | (673,000 | ) |  | (1,399,000 | ) |  | (1,155,000 | )
Related deferred taxes | 1,108,000 |  |  | 754,000 |  |  | (4,907,000 | )
Net change | (2,058,000 | ) |  | (1,399,000 | ) |  | 9,113,000 |
Balance at end of year | $ | (935,000 | ) |  | $ | 1,123,000 |  |  | $ | 2,522,000 |
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 years ended December 31, 2016, 2015, and 2014.
For the years ended December 31, | 2016 | 2015 | 2014
Balance at beginning of year | $ | (112,000 | ) | $ | (48,000 | ) | $ | — |
Net unrealized losses transferred during the year | — |  | — |  | (23,000 | )
Amortization of net unrealized losses | (26,000 | ) | (98,000 | ) | (51,000 | )
Related deferred taxes | 9,000 |  | 34,000 |  | 26,000 |
Net change | (17,000 | ) | (64,000 | ) | (48,000 | )
Balance at end of year | $ | (129,000 | ) | $ | (112,000 | ) | $ | (48,000 | )
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, 2016, 2015, and 2014.
For the years ended December 31, | 2016 | 2015 | 2014
Balance at beginning of year | $ | — |  | $ | — |  | $ | — |
Unrealized gains on cash flow hedging derivatives arising during the year | 1,790,000 |  | — |  | — |
Related deferred taxes | (627,000 | ) | — |  | — |
Net change | 1,163,000 |  | — |  | — |
Balance at end of year | $ | 1,163,000 |  | $ | — |  | $ | — |
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, 2016, 2015, and 2014:
For the years ended December 31, | 2016 |  | 2015 |  | 2014
Unrecognized postretirement benefits at beginning of year | $ | (156,000 | ) |  | $ | (125,000 | ) |  | $ | 188,000 |
Change in unamortized net actuarial loss | 84,000 |  |  | (48,000 | ) |  | (481,000 | )
Related deferred taxes | (30,000 | ) |  | 17,000 |  |  | 168,000 |
Net change | $ | 54,000 |  |  | $ | (31,000 | ) |  | $ | (313,000 | )
Unrecognized postretirement benefits at end of year | $ | (102,000 | ) |  | $ | (156,000 | ) |  | $ | (125,000 | )
The reclassification of unrecognized transition obligation and accumulated losses is a component of net periodic benefit cost (see Note 12) and the income tax effect is included in the income tax expense line of the consolidated statements of income and comprehensive income.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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