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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Net securities gains | $ 4,036 | $ 412 | $ 4,024 | $ 575
Interest income (expense) | 78,054 | 77,527 | 234,372 | 226,754
Other noninterest expense | 8,374 | 4,577 | 18,130 | 13,324
Income tax expense (benefit) | 9,322 | 8,578 | 26,245 | 23,699
Net income | 32,379 | 29,807 | 92,061 | 83,914
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Total reclassifications during the period, net of tax | 335 | (138) | 516 | (96)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Income tax expense (benefit) | (42) | (42) | (159) | (133)
Net income | 128 | 126 | 476 | 400
Gains (Losses) on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Net securities gains | (20) | 0 | 79 | 0
Amortization of Unrealized Gains Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Interest income (expense) | 190 | 168 | 556 | 533
Net Unrealized (Gains) on Cash Flow hedges Reclassified to Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Interest income (expense) | (395) | (638) | (1,932) | (1,537)
Income tax expense (benefit) | 98 | 159 | 483 | 384
Net income | (297) | (479) | (1,449) | (1,153)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Income tax expense (benefit) | (168) | (71) | (496) | (219)
Net income | 504 | 215 | 1,489 | 657
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Other noninterest expense | 649 | 263 | 1,916 | 809
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Other noninterest expense | $ 23 | $ 23 | $ 69 | $ 67

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