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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities gains | $ (26) | $ (14) | $ (40) | $ (21)
Interest income | 62,685 | 62,574 | 124,851 | 124,091
Salaries and employee benefits | 30,831 | 31,142 | 61,013 | 60,676
Income tax expense (benefit) | 9,757 | 14,059 | 18,947 | 22,731
Net of tax | 19,281 | 27,640 | 37,447 | 45,649
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of tax | 531 | 3 | 1,070 | 10
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] |  |  |  |
Net securities gains | (26) | (14) | (40) | (21)
Interest income | 307 | 0 | 614 | 0
Income tax expense (benefit) | (92) | 6 | (188) | 8
Net of tax | 189 | (8) | 386 | (13)
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 (benefit) | (219) | (8) | (438) | (15)
Net of tax | 342 | 11 | 684 | 23
Amortization of Net Gains [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Salaries and employee benefits | 567 | 74 | 1,133 | 148
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 | $ (6) | $ (55) | $ (11) | $ (110)

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