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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2019
Stockholders' Equity Note [Abstract] |
Accumulated Other Comprehensive Income (Loss) [Table Text Block] | A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
|  | Unrealized Gain (Loss) on |  |
|  | Available for Sale Securities |  | Employee Benefit Plans |  | Total
Balance, December 31, 2017 |  | $ | (35,385 | ) |  | $ | (789 | ) |  | $ | (36,174 | )
Transition adjustment for net unrealized gains on equity securities |  | (2,709 | ) |  | — |  |  | (2,709 | )
Net change in unrealized gain (loss) |  | (97,406 | ) |  | — |  |  | (97,406 | )
Reclassification adjustments included in earnings: |  |  |  |  |  |
Loss on available for sale securities, net |  | 290 |  |  | — |  |  | 290 |
Other comprehensive income (loss), before income taxes |  | (97,116 | ) |  | — |  |  | (97,116 | )
Federal and state income taxes 1 |  | (24,808 | ) |  | — |  |  | (24,808 | )
Other comprehensive income (loss), net of income taxes |  | (72,308 | ) |  | — |  |  | (72,308 | )
Balance, March 31, 2018 |  | $ | (110,402 | ) |  | $ | (789 | ) |  | $ | (111,191 | )
Balance, December 31, 2018 |  | $ | (70,999 | ) |  | $ | (1,586 | ) |  | $ | (72,585 | )
Net change in unrealized gain (loss) |  | 92,739 |  |  | — |  |  | 92,739 |
Reclassification adjustments included in earnings: |  |  |  |  |  |
Gain on available for sale securities, net |  | (76 | ) |  | — |  |  | (76 | )
Other comprehensive income (loss), before income taxes |  | 92,663 |  |  | — |  |  | 92,663 |
Federal and state income taxes 1 |  | 23,609 |  |  | — |  |  | 23,609 |
Other comprehensive income (loss), net of income taxes |  | 69,054 |  |  | — |  |  | 69,054 |
Balance, March 31, 2019 |  | $ | (1,945 | ) |  | $ | (1,586 | ) |  | $ | (3,531 | )
1 | Calculated using a 25 percent blended federal and state statutory tax rate.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- References No definition available. + Details
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