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Accumulated Other Comprehensive Loss Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on sale of investment securities |  |  |  |  |  |  |  |  | $ (62) | $ (69) | $ 0
Actual gain (loss) on plan assets |  |  |  |  |  |  |  |  | (1,324) | (880) |
Income tax expense | $ 4,565 | $ 5,098 | $ 4,732 | $ 7,322 | $ 6,319 | $ 6,193 | $ 5,813 | $ 5,810 | 21,717 | 24,135 | 18,015
Net Income Available to Common Shareholders | $ (22,222) | $ (20,126) | $ (18,251) | $ (28,996) | $ (22,611) | $ (22,371) | $ (22,751) | $ (21,619) | (89,595) | (89,352) | (70,002)
Unrealized Gains (Losses) on Securities Available-for-Sale | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on sale of investment securities |  |  |  |  |  |  |  |  | (62) | (69) | 0
Income tax expense |  |  |  |  |  |  |  |  | 15 | 15 | 0
Net Income Available to Common Shareholders |  |  |  |  |  |  |  |  | (47) | (54) | 0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Actual gain (loss) on plan assets |  |  |  |  |  |  |  |  | 0 | 0 | 163
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | (38)
Net Income Available to Common Shareholders |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 125

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