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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total other comprehensive income (loss), pre-tax | $ (3,429) | $ 3,980 | $ (12,800) | $ 8,862
Total other comprehensive income (loss), tax expense (benefit) | (873) | 1,538 | (3,259) | 3,426
Other comprehensive (loss) income, net of tax | (2,556) | 2,442 | (9,541) | 5,436
Securities available for sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (4,025) | 4,188 | (14,634) | 8,927
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (1,025) | 1,619 | (3,725) | 3,451
Other comprehensive income (loss), before reclassifications, net of tax | (3,000) | 2,569 | (10,909) | 5,476
Reclassification from AOCI, pre-tax |  | (29) |  |
Reclassification from AOCI, tax expense (benefit) |  | (11) |  |
Reclassification from AOCI, net of tax |  | (18) |  |
Total other comprehensive income (loss), pre-tax | (4,025) | 4,159 | (14,634) | 8,652
Total other comprehensive income (loss), tax expense (benefit) | (1,025) | 1,608 | (3,725) | 3,345
Other comprehensive (loss) income, net of tax | (3,000) | 2,551 | (10,909) | 5,307
Derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 519 | (270) | 1,670 | 6
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 132 | (105) | 425 | 2
Other comprehensive income (loss), before reclassifications, net of tax | 387 | (165) | 1,245 | 4
Total other comprehensive income (loss), pre-tax | 519 | (270) | 1,670 | 6
Total other comprehensive income (loss), tax expense (benefit) | 132 | (105) | 425 | 2
Other comprehensive (loss) income, net of tax | 387 | (165) | 1,245 | 4
Defined benefit Pension and Post-Retirement Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total other comprehensive income (loss), pre-tax | 77 | 91 | 164 | 204
Total other comprehensive income (loss), tax expense (benefit) | 20 | 35 | 41 | 79
Other comprehensive (loss) income, net of tax | 57 | 56 | 123 | 125
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, pre-tax | 77 | 91 | 164 | 204
Reclassification from AOCI, tax expense (benefit) | 20 | 35 | 41 | 79
Reclassification from AOCI, net of tax | $ 57 | $ 56 | $ 123 | 125
Accumulated net investment gain (loss), amortization of unrealized holding gains transferred to held to maturity attributable to parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, pre-tax |  |  |  | (275)
Reclassification from AOCI, tax expense (benefit) |  |  |  | (106)
Reclassification from AOCI, net of tax |  |  |  | $ (169)

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