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Shareholders' Equity | 6 Months Ended
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Jun. 30, 2020
Stockholders' Equity Note [Abstract] |
Shareholders' Equity [Text Block] | Shareholders' Equity On August 4, 2020, the Company declared a quarterly cash dividend of $0.51 per common share payable on or about August 26, 2020 to shareholders of record as of August 17, 2020. Dividends declared were $0.51 and $1.02 per share during the three and six months ended June 30, 2020 and $0.50 and $1.00 per share during the three and six months ended June 30, 2019. Accumulated Other Comprehensive Income (Loss) AOCI includes unrealized gains and losses on available for sale ("AFS") securities and non-credit related unrealized losses on AFS securities for which an other-than-temporary impairment has been recorded in earnings. Unrealized losses on employee benefit plans will be reclassified into income as pension plan costs are recognized over the remaining service period of plan participants. Gains and losses in AOCI are net of deferred income taxes. 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, Dec. 31, 2018 |  | $ | (70,999) |  |  | $ | (1,586) |  |  |  |  | $ | (72,585) |
Net change in unrealized gain (loss) |  | 228,156 |  |  | — |  |  |  |  | 228,156 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |
Gain on available for sale securities, net |  | (1,105) |  |  | — |  |  |  |  | (1,105) |
Other comprehensive income, before income taxes |  | 227,051 |  |  | — |  |  |  |  | 227,051 |
Federal and state income taxes1 |  | 55,897 |  |  | — |  |  |  |  | 55,897 |
Other comprehensive income, net of income taxes |  | 171,154 |  |  | — |  |  |  |  | 171,154 |
Balance, June 30, 2019 |  | $ | 100,155 |  |  | $ | (1,586) |  |  |  |  | $ | 98,569 |
Balance, Dec. 31, 2019 |  | $ | 104,996 |  |  | $ | (73) |  |  |  |  | $ | 104,923 |
Net change in unrealized gain (loss) |  | 354,765 |  |  | — |  |  |  |  | 354,765 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |
Gain on available for sale securities, net |  | (5,580) |  |  | — |  |  |  |  | (5,580) |
Other comprehensive income, before income taxes |  | 349,185 |  |  | — |  |  |  |  | 349,185 |
Federal and state income taxes1 |  | 83,792 |  |  | — |  |  |  |  | 83,792 |
Other comprehensive income, net of income taxes |  | 265,393 |  |  | — |  |  |  |  | 265,393 |
Balance, June 30, 2020 |  | $ | 370,389 |  |  | $ | (73) |  |  |  |  | $ | 370,316 |
1 Calculated using a 25 percent blended federal and state statutory tax rate.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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