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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Before-Tax Amount |  |
Net unrealized gains/losses | $ 29,527 | $ 16,181
Tax (Expense) Benefit |  |
Net unrealized gains/losses | (7,234) | (3,966)
Net of Tax |  |
Other comprehensive income | 22,293 | 12,215
Net unrealized gains/losses |  |
Before-Tax Amount |  |
Change in net unrealized gain/loss during the period | 29,302 | 15,756
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | (429) | 0
Net unrealized gains/losses | 28,873 | 15,756
Tax (Expense) Benefit |  |
Change in net unrealized gain/loss during the period | (7,179) | (3,862)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | 105 | 0
Net unrealized gains/losses | (7,074) | (3,862)
Net of Tax |  |
Change in net unrealized gain/loss during the period | 22,123 | 11,894
Net of tax | (324) | 0
Other comprehensive income | 21,799 | 11,894
Amortization of net retirement plan actuarial gain |  |
Before-Tax Amount |  |
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | 601 | 421
Tax (Expense) Benefit |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (147) | (103)
Net of Tax |  |
Net of tax | 454 | 318
Amortization of net retirement plan prior service cost |  |
Before-Tax Amount |  |
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | 53 | 4
Tax (Expense) Benefit |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (13) | (1)
Net of Tax |  |
Net of tax | 40 | 3
Employee benefit plans |  |
Before-Tax Amount |  |
Net unrealized gains/losses | 654 | 425
Tax (Expense) Benefit |  |
Net unrealized gains/losses | (160) | (104)
Net of Tax |  |
Other comprehensive income | $ 494 | $ 321

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