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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | $ (11,476) |  |  | $ 2,160 |  |  | $ (19,282) | $ 23,052
Total other comprehensive income (loss), tax expense (benefit) | (2,920) |  |  | 549 |  |  | (4,908) | 5,866
Other comprehensive (loss) income, net of tax | (8,556) | $ (889) | $ (4,929) | 1,611 | $ 1,838 | $ 13,737 | (14,374) | 17,186
Securities available for sale: |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (12,408) |  |  | 519 |  |  | (27,487) | 26,404
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (3,158) |  |  | 131 |  |  | (6,996) | 6,719
Other comprehensive income (loss), before reclassifications, net of tax | (9,250) |  |  | 388 |  |  | (20,491) | 19,685
Reclassification from AOCI, pre-tax | (764) |  |  |  |  |  | (2,121) | (31)
Reclassification from AOCI, tax expense (benefit) | (194) |  |  |  |  |  | (539) | (8)
Reclassification from AOCI, net of tax | (570) |  |  |  |  |  | (1,582) | (23)
Total other comprehensive income (loss), pre-tax | (13,172) |  |  | 519 |  |  | (29,608) | 26,373
Total other comprehensive income (loss), tax expense (benefit) | (3,352) |  |  | 131 |  |  | (7,535) | 6,711
Other comprehensive (loss) income, net of tax | (9,820) |  |  | 388 |  |  | (22,073) | 19,662
Derivative instruments: |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 1,629 |  |  |  |  |  | 10,129 | (3,516)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 414 |  |  |  |  |  | 2,578 | (895)
Other comprehensive income (loss), before reclassifications, net of tax | 1,215 |  |  |  |  |  | 7,551 | (2,621)
Total other comprehensive income (loss), pre-tax | 1,629 |  |  |  |  |  | 10,129 | (3,516)
Total other comprehensive income (loss), tax expense (benefit) | 414 |  |  |  |  |  | 2,578 | (895)
Other comprehensive (loss) income, net of tax | 1,215 |  |  |  |  |  | 7,551 | (2,621)
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Reclassification from AOCI, pre-tax | 67 |  |  | 65 |  |  | 197 | 195
Reclassification from AOCI, tax expense (benefit) | 18 |  |  | 17 |  |  | 49 | 50
Reclassification from AOCI, net of tax | 49 |  |  | 48 |  |  | 148 | 145
Total defined benefit pension and post-retirement benefit plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | 67 |  |  | 65 |  |  | 197 | 195
Total other comprehensive income (loss), tax expense (benefit) | 18 |  |  | 17 |  |  | 49 | 50
Other comprehensive (loss) income, net of tax | $ 49 |  |  | 48 |  |  | $ 148 | $ 145
Derivative instruments: |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  |  |  | 1,576 |  |  |  |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  |  |  | 401 |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax |  |  |  | 1,175 |  |  |  |
Total other comprehensive income (loss), pre-tax |  |  |  | 1,576 |  |  |  |
Total other comprehensive income (loss), tax expense (benefit) |  |  |  | 401 |  |  |  |
Other comprehensive (loss) income, net of tax |  |  |  | $ 1,175 |  |  |  |

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