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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Net securities gains | $ (69) | $ 91 | $ (12) | $ 163
Interest income (expense) | 78,627 | 75,741 | 156,318 | 149,227
Other noninterest expense | 4,630 | 4,332 | 9,756 | 8,747
Income tax expense (benefit) | 8,805 | 8,112 | 16,923 | 15,121
Net income | 30,555 | 28,121 | 59,682 | 54,107
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 | 89 | (51) | 181 | 42
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) | (50) | (44) | (117) | (91)
Net income | 149 | 133 | 348 | 274
Losses 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 |  |  | 99 | 0
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 (expense) | 199 | 177 | 366 | 365
Net Unrealized (Gains) on Cash Flow hedges Reclassified to Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Interest income (expense) | (738) | (540) | (1,537) | (899)
Income tax expense (benefit) | 185 | 135 | 385 | 225
Net income | (553) | (405) | (1,152) | (674)
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) | (164) | (74) | (328) | (148)
Net income | 493 | 221 | 985 | 442
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 | 633 | 273 | 1,267 | 546
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 | $ 24 | $ 22 | $ 46 | $ 44

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