Income Taxes - Narrative (Details) - USD ($) |
Dec. 31, 2019 |
Dec. 31, 2018 |
---|---|---|
Income Tax Disclosure [Abstract] | ||
Deferred tax assets (liabilities) related to net unrealized holdings losses/(gains) in the available-for-sale securities portfolio | $ (1,300,000) | $ 7,500,000 |
Deferred tax assets related to employee benefit plans | 15,500,000 | 12,900,000 |
Valuation allowance | 0 | 0 |
Unrecognized tax benefits | $ 0 | $ 0 |