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Accumulated Other Comprehensive Income (Loss) - Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |
Net realized gains on sales of available for sale securities | $ 1,140 | $ 1,609
Interest expense - subordinated debentures and term loans | 2,116 | 1,990
Income tax expense | (6,941) | (6,611)
Total reclassifications for the period, net of tax | 854 | 1,137
Unrealized gains (losses) on available for sale securities |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications for the period, net of tax | 901 | 1,271
Unrealized gains (losses) on cash flow hedges |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications for the period, net of tax | (47) | (134)
Unrealized Gains (Losses) on Defined Benefit Plans |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications for the period, net of tax | 0 | 0
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period | Unrealized gains (losses) on available for sale securities |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |
Net realized gains on sales of available for sale securities | 1,140 | 1,609
Income tax expense | (239) | (338)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period | Unrealized gains (losses) on cash flow hedges |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |
Income tax expense | 12 | 36
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period | Unrealized gains (losses) on cash flow hedges | Interest rate contracts |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense - subordinated debentures and term loans | $ (59) | $ (170)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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