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Accumulated Other Comprehensive Income Amounts reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment securities gains, net |  |  |  |  |  |  |  |  | $ 1,181 | $ 1,581 | $ 552
Income before income taxes | $ 43,035 | $ 39,608 | $ 36,650 | $ 30,488 | $ 37,338 | $ 37,295 | $ 31,799 | $ 35,188 | 149,781 | 141,620 | 117,785
Income Tax Expense (Benefit) | (12,317) | (12,124) | (11,245) | (9,229) | (10,598) | (11,515) | (9,853) | (10,827) | (44,915) | (42,793) | (36,211)
Net income | $ 30,718 | $ 27,484 | $ 25,405 | $ 21,259 | $ 26,740 | $ 25,780 | $ 21,946 | $ 24,361 | 104,866 | 98,827 | 81,574
Compensation and employee benefits |  |  |  |  |  |  |  |  | 150,282 | 149,410 | 130,864
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment securities gains, net |  |  |  |  |  |  |  |  | 1,181 | 1,581 | 552
Income before income taxes |  |  |  |  |  |  |  |  | 1,181 | 1,581 | 552
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (429) | (574) | (200)
Net income |  |  |  |  |  |  |  |  | 752 | 1,007 | 352
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | (668) | (336) | (149)
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 243 | 122 | 54
Net income |  |  |  |  |  |  |  |  | (425) | (214) | (95)
Compensation and employee benefits |  |  |  |  |  |  |  |  | $ (668) | $ (336) | $ (149)

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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