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Other Comprehensive Income - Changes in the Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | $ 2,160 |  |  | $ 1,587 |  |  | $ 23,052 | $ 26,276
Total other comprehensive income (loss), tax expense (benefit) | 549 |  |  | 403 |  |  | 5,866 | 6,686
Other comprehensive income, net of tax | 1,611 | $ 1,838 | $ 13,737 | 1,184 | $ 7,960 | $ 10,446 | 17,186 | 19,590
Securities available for sale: |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 519 |  |  | (84) |  |  | 26,404 | 27,695
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 131 |  |  | (22) |  |  | 6,719 | 7,047
Other comprehensive income (loss), before reclassifications, net of tax | 388 |  |  | (62) |  |  | 19,685 | 20,648
Reclassification from AOCI, pre-tax |  |  |  | 2,516 |  |  | (31) | 2,511
Reclassification from AOCI, tax expense (benefit) |  |  |  | 640 |  |  | (8) | 639
Reclassification from AOCI, net of tax |  |  |  | 1,876 |  |  | (23) | 1,872
Total other comprehensive income (loss), pre-tax | 519 |  |  | 2,432 |  |  | 26,373 | 30,206
Total other comprehensive income (loss), tax expense (benefit) | 131 |  |  | 618 |  |  | 6,711 | 7,686
Other comprehensive income, net of tax | 388 |  |  | 1,814 |  |  | 19,662 | 22,520
Derivative instruments: |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 1,576 |  |  |  |  |  | (3,516) | (4,244)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 401 |  |  |  |  |  | (895) | (1,080)
Other comprehensive income (loss), before reclassifications, net of tax | 1,175 |  |  |  |  |  | (2,621) | (3,164)
Total other comprehensive income (loss), pre-tax | 1,576 |  |  |  |  |  | (3,516) | (4,244)
Total other comprehensive income (loss), tax expense (benefit) | 401 |  |  |  |  |  | (895) | (1,080)
Other comprehensive income, net of tax | 1,175 |  |  |  |  |  | (2,621) | (3,164)
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Reclassification from AOCI, pre-tax | 65 |  |  | 104 |  |  | 195 | 314
Reclassification from AOCI, tax expense (benefit) | 17 |  |  | 26 |  |  | 50 | 80
Reclassification from AOCI, net of tax | 48 |  |  | 78 |  |  | 145 | 234
Total defined benefit pension and post-retirement benefit plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | 65 |  |  | 104 |  |  | 195 | 314
Total other comprehensive income (loss), tax expense (benefit) | 17 |  |  | 26 |  |  | 50 | 80
Other comprehensive income, net of tax | $ 48 |  |  | 78 |  |  | $ 145 | $ 234
Derivative instruments: |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  |  |  | (949) |  |  |  |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  |  |  | (241) |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax |  |  |  | (708) |  |  |  |
Total other comprehensive income (loss), pre-tax |  |  |  | (949) |  |  |  |
Total other comprehensive income (loss), tax expense (benefit) |  |  |  | (241) |  |  |  |
Other comprehensive income, net of tax |  |  |  | $ (708) |  |  |  |

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