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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Net securities (gains) losses | $ (566) | $ 388 | $ (4,213)
Interest income (expense) | 321,088 | 315,678 | 311,555
Other noninterest expense | 20,339 | 24,863 | 24,440
Income tax (benefit) expense | 44,973 | 28,699 | 34,411
Net Income | 154,885 | 104,388 | 121,021
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Total reclassifications, net of tax | 1,478 | 1,923 | 1,117
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Income tax (benefit) expense | (145) | (160) | (204)
Net Income | 432 | 481 | 612
Gains (losses) on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Net securities (gains) losses | 0 | (3) | 79
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 (expense) | 577 | 644 | 737
Net Unrealized Losses (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 income (expense) | 21 | 296 | (2,012)
Income tax (benefit) expense | (5) | (74) | 503
Net Income | 16 | 222 | (1,509)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Income tax (benefit) expense | (343) | (407) | (672)
Net Income | 1,030 | 1,220 | 2,014
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Other noninterest expense | 1,263 | 1,535 | 2,593
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustments out of AOCI [Abstract] |  |  |
Other noninterest expense | $ 110 | $ 92 | $ 93

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