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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Net securities gains | $ 91 | $ 2 | $ 163 | $ 2
Interest income | 75,741 | 69,621 | 149,227 | 138,112
Other noninterest income | 4,401 | 3,186 | 8,293 | 6,124
Other noninterest expense | 4,332 | 4,868 | 8,747 | 9,397
Interest expense | 9,026 | 6,273 | 16,300 | 12,218
Income tax (expense) benefit | (8,112) | (10,678) | (15,121) | (18,979)
Net income | 28,121 | 21,359 | 54,107 | 41,638
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Total reclassifications during the period, net of tax | (51) | 393 | 42 | 1,670
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Income tax (expense) benefit | (44) | (85) | (91) | (677)
Net income | 133 | 138 | 274 | 1,096
(Gains) on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Net securities gains | 0 | (2) | 0 | (2)
Amortization of Unrealized Gains Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Interest income | 177 | 225 | 365 | 463
Impairment Write-Down of Equity Security [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Other noninterest income |  |  | 0 | 1,312
Net Unrealized (Gains) Losses on Cash Flow hedges Reclassified to Interest (Income) Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Interest expense | (540) | (23) | (899) | 59
Income tax (expense) benefit | 135 | 9 | 225 | (23)
Net income | (405) | (14) | (674) | 36
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Income tax (expense) benefit | (74) | (166) | (148) | (332)
Net income | 221 | 269 | 442 | 538
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Other noninterest expense | 273 | 425 | 546 | 850
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Other noninterest expense | $ 22 | $ 10 | $ 44 | $ 20

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