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Reclassification Adjustments Out of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities gains | $ 4 | $ 0 | $ 2 | $ (30)
Interest income | 71,930 | 66,662 | 210,042 | 197,016
Other noninterest income | 3,945 | 4,113 | 10,069 | 12,188
Salaries and employee benefits | 32,740 | 32,783 | 99,081 | 98,155
Income tax (expense) | (11,342) | (10,303) | (30,321) | (30,291)
Net income | 22,876 | 20,001 | 64,514 | 58,801
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 | 430 | 479 | 2,063 | 1,439
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) | (83) | (105) | (760) | (317)
Net income | 133 | 162 | 1,229 | 496
Gains (Losses) 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 gains | 4 | 0 | 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 | 212 | 267 | 675 | 843
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) | (183) | (202) | (516) | (601)
Net income | 297 | 317 | 834 | 943
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 | 481 | 565 | 1,351 | 1,595
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 | $ (1) | $ (46) | $ (1) | $ (51)

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