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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Changes in the components of other comprehensive income (loss) | Changes in the components of other comprehensive income (loss), net of tax, were as follows for the periods presented:
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Three months ended September 30, 2018 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (6,548 | ) |  | $ | (1,666 | ) |  | $ | (4,882 | )
Reclassification adjustment for losses realized in net income | 15 |  |  | 4 |  |  | 11 |
Total securities available for sale | (6,533 | ) |  | (1,662 | ) |  | (4,871 | )
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 857 |  |  | 218 |  |  | 639 |
Total derivative instruments | 857 |  |  | 218 |  |  | 639 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 82 |  |  | 21 |  |  | 61 |
Total defined benefit pension and post-retirement benefit plans | 82 |  |  | 21 |  |  | 61 |
Total other comprehensive loss | $ | (5,594 | ) |  | $ | (1,423 | ) |  | $ | (4,171 | )
Three months ended September 30, 2017 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (1,188 | ) |  | $ | (459 | ) |  | $ | (729 | )
Unrealized holding gains on securities transferred from held to maturity to available for sale | 13,218 |  |  | 5,110 |  |  | 8,108 |
Reclassification adjustment for gains realized in net income | (57 | ) |  | (22 | ) |  | (35 | )
Amortization of unrealized holding gains on securities transferred to the held to maturity category | (7 | ) |  | (3 | ) |  | (4 | )
Total securities available for sale | 11,966 |  |  | 4,626 |  |  | 7,340 |
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 163 |  |  | 63 |  |  | 100 |
Total derivative instruments | 163 |  |  | 63 |  |  | 100 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 101 |  |  | 39 |  |  | 62 |
Total defined benefit pension and post-retirement benefit plans | 101 |  |  | 39 |  |  | 62 |
Total other comprehensive income | $ | 12,230 |  |  | $ | 4,728 |  |  | $ | 7,502 |
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Nine months ended September 30, 2018 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (21,182 | ) |  | $ | (5,391 | ) |  | $ | (15,791 | )
Reclassification adjustment for losses realized in net income | 15 |  |  | 4 |  |  | 11 |
Total securities available for sale | (21,167 | ) |  | (5,387 | ) |  | (15,780 | )
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 2,527 |  |  | 643 |  |  | 1,884 |
Total derivative instruments | 2,527 |  |  | 643 |  |  | 1,884 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 246 |  |  | 62 |  |  | 184 |
Total defined benefit pension and post-retirement benefit plans | 246 |  |  | 62 |  |  | 184 |
Total other comprehensive loss | $ | (18,394 | ) |  | $ | (4,682 | ) |  | $ | (13,712 | )
Nine months ended September 30, 2017 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 7,739 |  |  | $ | 2,992 |  |  | $ | 4,747 |
Unrealized holding gains on securities transferred from HTM to AFS | 13,218 |  |  | 5,110 |  |  | 8,108 |
Reclassification adjustment for gains realized in net income | (57 | ) |  | (22 | ) |  | (35 | )
Amortization of unrealized holding gains on securities transferred to the held to maturity category | (282 | ) |  | (109 | ) |  | (173 | )
Total securities available for sale | 20,618 |  |  | 7,971 |  |  | 12,647 |
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 169 |  |  | 65 |  |  | 104 |
Total derivative instruments | 169 |  |  | 65 |  |  | 104 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 305 |  |  | 118 |  |  | 187 |
Total defined benefit pension and post-retirement benefit plans | 305 |  |  | 118 |  |  | 187 |
Total other comprehensive income | $ | 21,092 |  |  | $ | 8,154 |  |  | $ | 12,938 |
Accumulated balances for each component of other comprehensive income (loss), net of tax | The accumulated balances for each component of other comprehensive income (loss), net of tax, were as follows as of the dates presented:
| September 30, 2018 |  | December 31, 2017
Unrealized gains (losses) on securities | $ | (6,410 | ) |  | $ | 7,363 |
Non-credit related portion of other-than-temporary impairment on securities | (11,320 | ) |  | (9,313 | )
Unrealized gains (losses) on derivative instruments | 889 |  |  | (995 | )
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations | (7,382 | ) |  | (7,566 | )
Total accumulated other comprehensive loss | $ | (24,223 | ) |  | $ | (10,511 | )

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