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Other Comprehensive Income (Loss) - Changes in the Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | $ (6,613) | $ 18,423
Total other comprehensive income (loss), tax expense (benefit) | (1,684) | 4,686
Other comprehensive (loss) income, net of tax | (4,929) | 13,737
Securities available for sale: |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (20,044) | 22,389
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (5,101) | 5,695
Other comprehensive income (loss), before reclassifications, net of tax | (14,943) | 16,694
Reclassification from AOCI, pre-tax | (1,357) |
Reclassification from AOCI, tax expense (benefit) | (345) |
Reclassification from AOCI, net of tax | (1,012) |
Total other comprehensive income (loss), pre-tax | (21,401) | 22,389
Total other comprehensive income (loss), tax expense (benefit) | (5,446) | 5,695
Other comprehensive (loss) income, net of tax | (15,955) | 16,694
Derivative instruments: |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 14,734 |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 3,750 |
Other comprehensive income (loss), before reclassifications, net of tax | 10,984 |
Total other comprehensive income (loss), pre-tax | 14,734 |
Total other comprehensive income (loss), tax expense (benefit) | 3,750 |
Other comprehensive (loss) income, net of tax | 10,984 |
Amortization of net actuarial loss recognized in net periodic pension cost |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification from AOCI, pre-tax | 54 | 62
Reclassification from AOCI, tax expense (benefit) | 12 | 16
Reclassification from AOCI, net of tax | 42 | 46
Total defined benefit pension and post-retirement benefit plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | 54 | 62
Total other comprehensive income (loss), tax expense (benefit) | 12 | 16
Other comprehensive (loss) income, net of tax | $ 42 | 46
Derivative instruments: |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  | (4,028)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  | (1,025)
Other comprehensive income (loss), before reclassifications, net of tax |  | (3,003)
Total other comprehensive income (loss), pre-tax |  | (4,028)
Total other comprehensive income (loss), tax expense (benefit) |  | (1,025)
Other comprehensive (loss) income, net of tax |  | $ (3,003)

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