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Reclassification Adjustments Out of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities gain | $ (2) | $ (1) | $ (2) | $ (30)
Interest income | 69,621 | 65,777 | 138,112 | 130,354
Other noninterest income | 3,186 | 4,626 | 6,124 | 8,075
Salaries and employee benefits | 32,754 | 32,931 | 66,341 | 65,372
Income tax (expense) | (10,678) | (10,257) | (18,979) | (19,988)
Net income | 21,359 | 19,909 | 41,638 | 38,800
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassification during the period, net of tax | 407 | 484 | 2,135 | 959
AOCI Attributable to Parent [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income |  |  | 0 | 0
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax (expense) | (85) | (108) | (176) | (213)
Net income | 138 | 171 | 1,597 | 333
Gains on Available for Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities gain | (2) | (1) | (2) | (30)
Amortization of Unrealized Gains and Losses Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income | 225 | 280 | 463 | 576
Impairment Write-Down of Equity Security [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other noninterest income |  |  | 1,312 | 0
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax (expense) | (166) | (199) | (332) | (398)
Net income | 269 | 313 | 538 | 626
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Salaries and employee benefits | 435 | 515 | 870 | 1,030
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Salaries and employee benefits | $ 0 | $ (3) | $ 0 | $ (6)

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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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