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Other Comprehensive Income/Loss - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Investment securities available-for sale: |  |  |  |
Change in net unrealized gain during period, pre-tax | $ (6,300) | $ (1,800) | $ (33,900) | $ 15,600
Change in net unrealized gain during period, tax expense (benefit) | (1,700) | (800) | (8,900) | 6,100
Change in net unrealized gain during period, net of tax | (4,600) | (1,000) | (25,000) | 9,500
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity, pre-tax | 500 | 500 | 1,500 | 1,400
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity, tax expense (benefit) | 100 | 200 | 400 | 600
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity, net of tax | 400 | 300 | 1,100 | 800
Defined benefits post-retirement benefit plan: |  |  |  |
Change in net actuarial (gain) loss, pre-tax | (200) | (200) | (500) | (1,100)
Change in net actuarial (gain) loss, tax expense (benefit) | 0 | (100) | (100) | (400)
Change in net actuarial (gain) loss, net of tax amount | (200) | (100) | (400) | (700)
Other comprehensive income (loss), before tax | (6,000) | (1,800) | (32,900) | 15,100
Total other comprehensive income, tax expense (benefit) | (1,600) | (800) | (8,600) | 6,000
Total other comprehensive income, net of tax amount | (4,400) | (1,000) | (24,300) | 9,100
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 0 | (600) | 0 | (1,100)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 0 | (300) | 0 | (400)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | 0 | (300) | 0 | (700)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 0 | (1,100) | 0 | (1,100)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | 0 | (500) | 0 | (400)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0 | (600) | 0 | (700)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 0 | 800 | 0 | 800
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0 | 300 | 0 | 300
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | $ 0 | $ 500 | $ 0 | $ 500

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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration