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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on sale of investment securities |  |  |  |  |  |  |  |  | $ 0 | $ (4,476) | $ (3,513)
Actual gain (loss) on plan assets |  |  |  |  |  |  |  |  | (434) | 1,890 |
Income tax expense | $ 2,646 | $ 5,606 | $ 5,358 | $ 4,405 | $ 14,972 | $ 7,003 | $ 6,812 | $ 7,647 | 18,015 | 36,435 | 25,083
Net Income Available to Common Shareholders | $ (10,713) | $ (20,692) | $ (20,979) | $ (17,616) | $ (9,669) | $ (13,932) | $ (14,685) | $ (16,026) | (70,002) | (54,310) | (52,128)
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 |  |  |  |  |  |  |  |  | 0 | (4,476) | (3,513)
Income tax expense |  |  |  |  |  |  |  |  | 0 | 1,657 | 1,297
Net Income Available to Common Shareholders |  |  |  |  |  |  |  |  | 0 | $ (2,819) | $ (2,216)
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 |  |  |  |  |  |  |  |  | (163) |  |
Income tax expense |  |  |  |  |  |  |  |  | (38) |  |
Net Income Available to Common Shareholders |  |  |  |  |  |  |  |  | $ 125 |  |

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