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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, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | $ (9,371) | $ 4,882
Total other comprehensive income (loss), tax expense (benefit) | (2,386) | 1,888
Other comprehensive (loss) income, net of tax | (6,985) | 2,994
Securities available for sale |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (10,609) | 4,739
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (2,700) | 1,832
Other comprehensive income (loss), before reclassifications, net of tax | (7,909) | 2,907
Reclassification from AOCI, pre-tax |  | (246)
Reclassification from AOCI, tax expense (benefit) |  | (95)
Reclassification from AOCI, net of tax |  | (151)
Total other comprehensive income (loss), pre-tax | (10,609) | 4,493
Total other comprehensive income (loss), tax expense (benefit) | (2,700) | 1,737
Other comprehensive (loss) income, net of tax | (7,909) | 2,756
Derivative instruments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 1,151 | 276
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 293 | 107
Other comprehensive income (loss), before reclassifications, net of tax | 858 | 169
Total other comprehensive income (loss), pre-tax | 1,151 | 276
Total other comprehensive income (loss), tax expense (benefit) | 293 | 107
Other comprehensive (loss) income, net of tax | 858 | 169
Defined benefit Pension and Post-Retirement Benefit Plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | 87 | 113
Total other comprehensive income (loss), tax expense (benefit) | 21 | 44
Other comprehensive (loss) income, net of tax | 66 | 69
Amortization of net actuarial loss recognized in net periodic pension cost |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification from AOCI, pre-tax | 87 | 113
Reclassification from AOCI, tax expense (benefit) | 21 | 44
Reclassification from AOCI, net of tax | $ 66 | $ 69

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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