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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Changes in the components of other comprehensive income | Changes in the components of other comprehensive income, net of tax, were as follows for the periods presented:
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Three months ended June 30, 2021 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 4,965 |  |  | $ | 1,263 |  |  | $ | 3,702 |
Total securities available for sale | 4,965 |  |  | 1,263 |  |  | 3,702 |
Derivative instruments: |  |  |  |  |
Unrealized holding losses on derivative instruments | (6,234) |  |  | (1,586) |  |  | (4,648) |
Total derivative instruments | (6,234) |  |  | (1,586) |  |  | (4,648) |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 76 |  |  | 19 |  |  | 57 |
Total defined benefit pension and post-retirement benefit plans | 76 |  |  | 19 |  |  | 57 |
Total other comprehensive loss | $ | (1,193) |  |  | $ | (304) |  |  | $ | (889) |
Three months ended June 30, 2020 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 3,496 |  |  | $ | 893 |  |  | $ | 2,603 |
Reclassification adjustment for gains realized in net income | (31) |  |  | (8) |  |  | (23) |
Total securities available for sale | 3,465 |  |  | 885 |  |  | 2,580 |
Derivative instruments: |  |  |  |  |
Unrealized holding losses on derivative instruments | (1,064) |  |  | (271) |  |  | (793) |
Total derivative instruments | (1,064) |  |  | (271) |  |  | (793) |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 68 |  |  | 17 |  |  | 51 |
Total defined benefit pension and post-retirement benefit plans | 68 |  |  | 17 |  |  | 51 |
Total other comprehensive income | $ | 2,469 |  |  | $ | 631 |  |  | $ | 1,838 |
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Six months ended June 30, 2021 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (15,079) |  |  | $ | (3,838) |  |  | $ | (11,241) |
Reclassification adjustment for gains realized in net income | (1,357) |  |  | (345) |  |  | (1,012) |
Total securities available for sale | (16,436) |  |  | (4,183) |  |  | (12,253) |
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 8,500 |  |  | 2,164 |  |  | 6,336 |
Total derivative instruments | 8,500 |  |  | 2,164 |  |  | 6,336 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 130 |  |  | 31 |  |  | 99 |
Total defined benefit pension and post-retirement benefit plans | 130 |  |  | 31 |  |  | 99 |
Total other comprehensive loss | $ | (7,806) |  |  | $ | (1,988) |  |  | $ | (5,818) |
Six months ended June 30, 2020 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 25,885 |  |  | $ | 6,588 |  |  | $ | 19,297 |
Reclassification adjustment for gains realized in net income | (31) |  |  | (8) |  |  | (23) |
Total securities available for sale | 25,854 |  |  | 6,580 |  |  | 19,274 |
Derivative instruments: |  |  |  |  |
Unrealized holding losses on derivative instruments | (5,092) |  |  | (1,296) |  |  | (3,796) |
Total derivative instruments | (5,092) |  |  | (1,296) |  |  | (3,796) |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 130 |  |  | 33 |  |  | 97 |
Total defined benefit pension and post-retirement benefit plans | 130 |  |  | 33 |  |  | 97 |
Total other comprehensive income | $ | 20,892 |  |  | $ | 5,317 |  |  | $ | 15,575 |
Accumulated balances for each component of other comprehensive income, net of tax | The accumulated balances for each component of other comprehensive income, net of tax, were as follows as of the dates presented:
| June 30, 2021 |  | December 31, 2020
Unrealized gains on securities | $ | 18,674 |  |  | $ | 42,246 |
Non-credit related portion of previously recorded other-than-temporary impairment on securities | — |  |  | (11,319) |
Unrealized gains (losses) on derivative instruments | 5,698 |  |  | (638) |
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations | (5,122) |  |  | (5,221) |
Total accumulated other comprehensive income | $ | 19,250 |  |  | $ | 25,068 |

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