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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | $ (1,193) |  | $ 2,469 |  | $ (7,806) | $ 20,892
Total other comprehensive income (loss), tax expense (benefit) | (304) |  | 631 |  | (1,988) | 5,317
Other comprehensive (loss) income, net of tax | (889) | $ (4,929) | 1,838 | $ 13,737 | (5,818) | 15,575
Securities available for sale: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 4,965 |  | 3,496 |  | (15,079) | 25,885
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 1,263 |  | 893 |  | (3,838) | 6,588
Other comprehensive income (loss), before reclassifications, net of tax | 3,702 |  | 2,603 |  | (11,241) | 19,297
Reclassification from AOCI, pre-tax |  |  | (31) |  | (1,357) | (31)
Reclassification from AOCI, tax expense (benefit) |  |  | (8) |  | (345) | (8)
Reclassification from AOCI, net of tax |  |  | (23) |  | (1,012) | (23)
Total other comprehensive income (loss), pre-tax | 4,965 |  | 3,465 |  | (16,436) | 25,854
Total other comprehensive income (loss), tax expense (benefit) | 1,263 |  | 885 |  | (4,183) | 6,580
Other comprehensive (loss) income, net of tax | 3,702 |  | 2,580 |  | (12,253) | 19,274
Derivative instruments: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (6,234) |  |  |  | 8,500 | (5,092)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (1,586) |  |  |  | 2,164 | (1,296)
Other comprehensive income (loss), before reclassifications, net of tax | (4,648) |  |  |  | 6,336 | (3,796)
Total other comprehensive income (loss), pre-tax | (6,234) |  |  |  | 8,500 | (5,092)
Total other comprehensive income (loss), tax expense (benefit) | (1,586) |  |  |  | 2,164 | (1,296)
Other comprehensive (loss) income, net of tax | (4,648) |  |  |  | 6,336 | (3,796)
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Reclassification from AOCI, pre-tax | 76 |  | 68 |  | 130 | 130
Reclassification from AOCI, tax expense (benefit) | 19 |  | 17 |  | 31 | 33
Reclassification from AOCI, net of tax | 57 |  | 51 |  | 99 | 97
Total defined benefit pension and post-retirement benefit plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | 76 |  | 68 |  | 130 | 130
Total other comprehensive income (loss), tax expense (benefit) | 19 |  | 17 |  | 31 | 33
Other comprehensive (loss) income, net of tax | $ 57 |  | 51 |  | $ 99 | $ 97
Derivative instruments: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  |  | (1,064) |  |  |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  |  | (271) |  |  |
Other comprehensive income (loss), before reclassifications, net of tax |  |  | (793) |  |  |
Total other comprehensive income (loss), pre-tax |  |  | (1,064) |  |  |
Total other comprehensive income (loss), tax expense (benefit) |  |  | (271) |  |  |
Other comprehensive (loss) income, net of tax |  |  | $ (793) |  |  |

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