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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, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | $ 18,423 | $ 14,010
Total other comprehensive income (loss), tax expense (benefit) | 4,686 | 3,564
Other comprehensive income, net of tax | 13,737 | 10,446
Securities available for sale: |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 22,389 | 15,179
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 5,695 | 3,862
Other comprehensive income (loss), before reclassifications, net of tax | 16,694 | 11,317
Reclassification from AOCI, pre-tax | 0 | (13)
Reclassification from AOCI, tax expense (benefit) | 0 | (3)
Reclassification from AOCI, net of tax | 0 | (10)
Total other comprehensive income (loss), pre-tax | 22,389 | 15,166
Total other comprehensive income (loss), tax expense (benefit) | 5,695 | 3,859
Other comprehensive income, net of tax | 16,694 | 11,307
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 income, net of tax | (3,003) |
Amortization of net actuarial loss recognized in net periodic pension cost |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification from AOCI, pre-tax | 62 | 72
Reclassification from AOCI, tax expense (benefit) | 16 | 18
Reclassification from AOCI, net of tax | 46 | 54
Total defined benefit pension and post-retirement benefit plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | 62 | 72
Total other comprehensive income (loss), tax expense (benefit) | 16 | 18
Other comprehensive income, net of tax | $ 46 | 54
Derivative instruments: |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  | (1,228)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  | (313)
Other comprehensive income (loss), before reclassifications, net of tax |  | (915)
Total other comprehensive income (loss), pre-tax |  | (1,228)
Total other comprehensive income (loss), tax expense (benefit) |  | (313)
Other comprehensive income, net of tax |  | $ (915)

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