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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Reclassification Adjustment out of AOCI [Abstract] |  |
Net securities (gains) losses | $ (812) | $ 57
Interest income (expense) | 77,181 | 77,691
Other noninterest expense | 6,957 | 5,126
Income tax (benefit) expense | 1,715 | 8,118
Net income | 10,368 | 29,127
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Total reclassifications during the period, net of tax | 421 | 92
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Income tax (benefit) expense | (42) | (67)
Net income | 128 | 199
Gains (Losses) on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Net securities (gains) losses | (3) | 99
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) | 173 | 167
Net Unrealized Losses (Gains) 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) | 10 | (799)
Income tax (benefit) expense | (3) | 200
Net income | 7 | (599)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Income tax (benefit) expense | (95) | (164)
Net income | 286 | 492
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Other noninterest expense | 358 | 634
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Other noninterest expense | $ 23 | $ 22

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