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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Net securities (gains) losses | $ (4,213) | $ 6,341 | $ (1,867)
Interest income | 311,555 | 305,629 | 283,493
Other noninterest income | 18,853 | 15,228 | 11,991
Other noninterest expense | 24,440 | 19,597 | 20,308
Interest expense | (55,979) | (38,626) | (25,914)
Income tax expense (benefit) | 34,411 | 24,436 | 46,010
Net Income | 121,021 | 112,566 | 82,151
Total reclassifications, net of tax | 1,117 | 4,617 | 1,131
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Income tax expense (benefit) | (204) | (1,827) | (120)
Net Income | 612 | 5,483 | 198
Losses (Gains) on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Net securities (gains) losses | 79 | 6,622 | (1,869)
Amortization of Unrealized Gains Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Interest income | 737 | 688 | 875
Impairment Write-Down of an Equity Security [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Other noninterest income | 0 | 0 | 1,312
Net Unrealized (Gains) on Cash Flow Hedges Reclassified to Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Interest expense | (2,012) | (2,300) | (292)
Income tax expense (benefit) | 503 | 575 | 113
Net Income | (1,509) | (1,725) | (179)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Income tax expense (benefit) | (672) | (286) | (740)
Net Income | 2,014 | 859 | 1,112
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Other noninterest expense | 2,593 | 1,054 | 1,755
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Other noninterest expense | $ 93 | $ 91 | $ 97

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