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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reclassification Adjustment out of AOCI [Abstract] |  |  |  |
Net securities (gains) losses | $ 84 | $ 4,036 | $ (548) | $ 4,024
Interest income (expense) | 77,943 | 78,054 | 235,570 | 234,372
Other noninterest expense | 3,857 | 8,374 | 14,730 | 18,130
Income tax (benefit) expense | 10,988 | 9,322 | 19,267 | 26,245
Net income | 35,113 | 32,379 | 70,194 | 92,061
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of AOCI [Abstract] |  |  |  |
Total reclassifications during the period, net of tax | 480 | 335 | 1,370 | 516
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 | (39) | (42) | (123) | (159)
Net income | 118 | 128 | 369 | 476
(Gains) Losses on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of AOCI [Abstract] |  |  |  |
Net securities (gains) losses | 0 | (20) | (3) | 79
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) | 157 | 190 | 495 | 556
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) | 101 | (395) | 192 | (1,932)
Income tax (benefit) expense | (25) | 98 | (48) | 483
Net income | 76 | (297) | 144 | (1,449)
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) | (168) | (286) | (496)
Net income | 286 | 504 | 857 | 1,489
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of AOCI [Abstract] |  |  |  |
Other noninterest expense | 359 | 649 | 1,075 | 1,916
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of AOCI [Abstract] |  |  |  |
Other noninterest expense | $ 22 | $ 23 | $ 68 | $ 69

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