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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity Note [Abstract] |
Schedule of tax effect allocated to each component of other comprehensive income | The tax effect allocated to each component of other comprehensive income (loss) were as follows:
December 31, 2018 | Before-Tax Amount |  | Tax (Expense) Benefit |  | Net of Tax
Available-for-sale securities: |  |  |  |  |
(in thousands) |  |  |  |  |
Change in net unrealized loss during the period | $ | (14,550 | ) |  | $ | 3,569 |  |  | $ | (10,981 | )
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | 440 |  |  | (108 | ) |  | 332 |
Net unrealized losses | (14,110 | ) |  | 3,461 |  |  | (10,649 | )
Employee benefit plans: |  |  |  |  |
Net retirement plan loss | (3,437 | ) |  | 843 |  |  | (2,594 | )
Amortization of net retirement plan actuarial gain | 1,719 |  |  | (421 | ) |  | 1,298 |
Amortization of net retirement plan prior service (cost) credit | 15 |  |  | (4 | ) |  | 11 |
Employee benefit plans | (1,703 | ) |  | 418 |  |  | (1,285 | )
Other comprehensive loss | $ | (15,813 | ) |  | $ | 3,879 |  |  | $ | (11,934 | )
December 31, 2017 | Before-Tax Amount |  | Tax (Expense) Benefit |  | Net of Tax
Available-for-sale securities: |  |  |  |  |
(in thousands) |  |  |  |  |
Change in net unrealized loss during the period | $ | (4,442 | ) |  | $ | 1,761 |  |  | $ | (2,681 | )
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | 407 |  |  | (163 | ) |  | 244 |
Net unrealized losses | (4,035 | ) |  | 1,598 |  |  | (2,437 | )
Employee benefit plans: |  |  |  |  |
Net retirement plan loss | (4,549 | ) |  | 1,115 |  |  | (3,434 | )
Net retirement plan prior service credit | 964 |  |  | (236 | ) |  | 728 |
Amortization of net retirement plan actuarial gain | 1,508 |  |  | (603 | ) |  | 905 |
Amortization of net retirement plan prior service (cost) credit | 15 |  |  | (6 | ) |  | 9 |
Employee benefit plans | (2,062 | ) |  | 270 |  |  | (1,792 | )
Other comprehensive loss | $ | (6,097 | ) |  | $ | 1,868 |  |  | $ | (4,229 | )
December 31, 2016 | Before-Tax Amount |  | Tax (Expense) Benefit |  | Net of Tax
Available-for-sale securities: |  |  |  |  |
(in thousands) |  |  |  |  |
Change in net unrealized loss during the period | $ | (7,689 | ) |  | $ | 3,074 |  |  | $ | (4,615 | )
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (926 | ) |  | 370 |  |  | (556 | )
Net unrealized losses | (8,615 | ) |  | 3,444 |  |  | (5,171 | )
Employee benefit plans: |  |  |  |  |
Net retirement plan loss | (2,787 | ) |  | 1,114 |  |  | (1,673 | )
Net retirement plan prior service credit | (188 | ) |  | 75 |  |  | (113 | )
Amortization of net retirement plan actuarial loss | 1,338 |  |  | (535 | ) |  | 803 |
Amortization of net retirement plan prior service (cost) credit | 76 |  |  | (30 | ) |  | 46 |
Employee benefit plans | (1,561 | ) |  | 624 |  |  | (937 | )
Other comprehensive loss | $ | (10,176 | ) |  | $ | 4,068 |  |  | $ | (6,108 | )
Schedule of accumulated other comprehensive income | The following table presents the activity in our accumulated other comprehensive loss for the periods indicated:
(in thousands) | Available-for-Sale Securities |  | Employee Benefit Plans |  | Accumulated Other Comprehensive Income (loss)
Balance at January 1, 2016 | $ | (2,744 | ) |  | $ | (28,257 | ) |  | $ | (31,001 | )
Other comprehensive loss | (5,171 | ) |  | (937 | ) |  | (6,108 | )
Balance at December 31, 2016 | $ | (7,915 | ) |  | $ | (29,194 | ) |  | $ | (37,109 | )
Balance at January 1, 2017 | (7,915 | ) |  | (29,194 | ) |  | (37,109 | )
Other comprehensive loss | (2,437 | ) |  | (1,792 | ) |  | (4,229 | )
Balance at reclassification due to adoption of ASU 2018-02 | $ | (2,653 | ) |  | $ | (7,305 | ) |  | $ | (9,958 | )
Balance at December 31, 2017 | (13,005 | ) |  | (38,291 | ) |  | (51,296 | )
Balance at January 1, 2018 | (13,005 | ) |  | (38,291 | ) |  | (51,296 | )
Other comprehensive loss | (10,649 | ) |  | (1,285 | ) |  | (11,934 | )
Adoption of ASU 2016-01 | 65 |  |  | 0 |  |  | 65 |
Balance at December 31, 2018 | $ | (23,589 | ) |  | $ | (39,576 | ) |  | $ | (63,165 | )
December 31, 2018 |  |  |
Details about Accumulated other Comprehensive Income Components (in thousands) | Amount Reclassified from Accumulated Other Comprehensive (Loss)1 |  | Affected Line Item in the Statement Where Net Income is Presented
Available-for-sale securities: |  |  |
Unrealized gains and losses on available-for-sale securities | $ | (440 | ) |  | Net (loss) gain on securities transactions
| 108 |  |  | Tax benefit
| (332 | ) |  | Net of tax
Employee benefit plans: |  |  |
Amortization of the following 2 |  |  |
Net retirement plan actuarial gain | (1,719 | ) |  | Other operating expense
Net retirement plan prior service credit | (15 | ) |  | Other operating expense
| (1,734 | ) |  | Total before tax
| 425 |  |  | Tax benefit
| (1,309 | ) |  | Net of tax
December 31, 2017 |  |  |
Details about Accumulated other Comprehensive Income Components (in thousands) | Amount Reclassified from Accumulated Other Comprehensive (Loss)1 |  | Affected Line Item in the Statement Where Net Income is Presented
Available-for-sale securities: |  |  |
Unrealized gains and losses on available-for-sale securities | $ | (407 | ) |  | Net (loss) gain on securities transactions
| 163 |  |  | Tax benefit
| (244 | ) |  | Net of tax
Employee benefit plans: |  |  |
Amortization of the following 2 |  |  |
Net retirement plan actuarial gain | (1,508 | ) |  | Other operating expense
Net retirement plan prior service credit | (15 | ) |  | Other operating expense
| (1,523 | ) |  | Total before tax
| 609 |  |  | Tax benefit
| (914 | ) |  | Net of tax
1 Amounts in parentheses indicate debits in income statement. 2 The accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (See Note 11 - “Employee Benefit Plans”).

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