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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of AOCI [Abstract] |  |
Net securities (gains) losses | $ 467 | $ (812)
Interest income (expense) | 79,055 | 77,181
Other noninterest expense | 2,757 | 6,957
Income tax (benefit) | 11,155 | 1,715
Net income | 39,846 | 10,368
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Total reclassifications during the period, net of tax | 368 | 421
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Income tax (benefit) | (35) | (42)
Net income | 107 | 128
Gains on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Net securities (gains) losses | 0 | (3)
Amortization of Unrealized Gains Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Interest income (expense) | 142 | 173
Net Unrealized Losses on Cash Flow Hedges Reclassified to Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Interest income (expense) | 21 | 10
Income tax (benefit) | (5) | (3)
Net income | 16 | 7
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Income tax (benefit) | (81) | (95)
Net income | 245 | 286
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Other noninterest expense | 298 | 358
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Other noninterest expense | $ 28 | $ 23

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