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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Pre-Tax Amount |  |
Other Comprehensive Income/(Loss), Pre-Tax Amount | $ (10,055) | $ 22,033
Tax (Expense) Benefit |  |
Other Comprehensive Income/(Loss), Tax (Expense) Benefit | 2,145 | (4,691)
Net of Tax Amount |  |
Other Comprehensive Income/(Loss), Net of Tax Amount | (7,910) | 17,342
Pension settlement charge | 700 |
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |
Pre-Tax Amount |  |
Change in net unrealized gains/(losses) on debt securities available-for-sale | (9,712) | 21,568
Tax (Expense) Benefit |  |
Change in net unrealized gains/(losses) on debt securities available-for-sale | 2,072 | (4,592)
Net of Tax Amount |  |
Change in net unrealized gains/(losses) on debt securities available-for-sale | (7,640) | 16,976
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |
Pre-Tax Amount |  |
Other Comprehensive Income/(Loss), Pre-Tax Amount | (343) | 465
Tax (Expense) Benefit |  |
Other Comprehensive Income/(Loss), Tax (Expense) Benefit | 73 | (99)
Net of Tax Amount |  |
Other Comprehensive Income/(Loss), Net of Tax Amount | $ (270) | $ 366

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