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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, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | $ 1,587 |  |  | $ (5,594) |  |  | $ 26,276 | $ (18,394)
Total other comprehensive income (loss), tax expense (benefit) | 403 |  |  | (1,423) |  |  | 6,686 | (4,682)
Other comprehensive income (loss), net of tax | 1,184 | $ 7,960 | $ 10,446 | (4,171) | $ (2,556) | $ (6,985) | 19,590 | (13,712)
Securities available for sale |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (84) |  |  | (6,548) |  |  | 27,695 | (21,182)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (22) |  |  | (1,666) |  |  | 7,047 | (5,391)
Other comprehensive income (loss), before reclassifications, net of tax | (62) |  |  | (4,882) |  |  | 20,648 | (15,791)
Reclassification from AOCI, pre-tax | 2,516 |  |  | 15 |  |  | 2,511 | 15
Reclassification from AOCI, tax expense (benefit) | 640 |  |  | 4 |  |  | 639 | 4
Reclassification from AOCI, net of tax | 1,876 |  |  | 11 |  |  | 1,872 | 11
Total other comprehensive income (loss), pre-tax | 2,432 |  |  | (6,533) |  |  | 30,206 | (21,167)
Total other comprehensive income (loss), tax expense (benefit) | 618 |  |  | (1,662) |  |  | 7,686 | (5,387)
Other comprehensive income (loss), net of tax | 1,814 |  |  | (4,871) |  |  | 22,520 | (15,780)
Derivative instruments |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (949) |  |  |  |  |  | (4,244) |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (241) |  |  |  |  |  | (1,080) |
Other comprehensive income (loss), before reclassifications, net of tax | (708) |  |  |  |  |  | (3,164) |
Total other comprehensive income (loss), pre-tax | (949) |  |  |  |  |  | (4,244) |
Total other comprehensive income (loss), tax expense (benefit) | (241) |  |  |  |  |  | (1,080) |
Other comprehensive income (loss), net of tax | (708) |  |  |  |  |  | (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 | 104 |  |  | 82 |  |  | 314 | 246
Reclassification from AOCI, tax expense (benefit) | 26 |  |  | 21 |  |  | 80 | 62
Reclassification from AOCI, net of tax | 78 |  |  | 61 |  |  | 234 | 184
Defined benefit pension and post-retirement benefit plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | 104 |  |  | 82 |  |  | 314 | 246
Total other comprehensive income (loss), tax expense (benefit) | 26 |  |  | 21 |  |  | 80 | 62
Other comprehensive income (loss), net of tax | $ 78 |  |  | 61 |  |  | $ 234 | 184
Derivative instruments |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  |  |  | 857 |  |  |  | 2,527
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  |  |  | 218 |  |  |  | 643
Other comprehensive income (loss), before reclassifications, net of tax |  |  |  | 639 |  |  |  | 1,884
Total other comprehensive income (loss), pre-tax |  |  |  | 857 |  |  |  | 2,527
Total other comprehensive income (loss), tax expense (benefit) |  |  |  | 218 |  |  |  | 643
Other comprehensive income (loss), net of tax |  |  |  | $ 639 |  |  |  | $ 1,884

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