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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Reclassification Adjustment out of AOCI [Abstract] |  |
Net securities (gains) losses | $ (179) | $ 467
Interest income (expense) | 80,348 | 79,055
Other noninterest expense | 3,119 | 2,757
Income tax (benefit) | 11,142 | 11,155
Net income | 39,126 | 39,846
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Total reclassifications during the period, net of tax | 241 | 368
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) | (35)
Net income | 102 | 107
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) | 137 | 142
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) | 0 | 21
Income tax (benefit) | 0 | (5)
Net income | 0 | 16
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Income tax (benefit) | (47) | (81)
Net income | 139 | 245
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Other noninterest expense | 157 | 298
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of AOCI [Abstract] |  |
Other noninterest expense | $ 29 | $ 28

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