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Other Comprehensive Income (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net gain on securities transactions | $ 0 | $ 96
Income tax expense | (8,368) | (8,736)
Net of tax | 23,508 | 20,973
Reclassification adjustment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net of tax | 37 | 198
Reclassification adjustment [Member] | Unrealized gains on securities available for sale [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net gain on securities transactions | 0 | 96
Income tax expense | 0 | (39)
Net of tax | 0 | 57
Reclassification adjustment [Member] | Post-retirement obligations [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Compensation and employee benefits (1) | 61 | 236
Income tax expense | (24) | (95)
Net of tax | $ 37 | $ 141

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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