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Note 13 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Balance | $ 1,713,785 | $ 1,696,534 | $ 1,690,426
Change, net of tax | 4,433 | 4,421 | 5,159
Balance | 1,760,787 | 1,713,785 | 1,696,534
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |
Balance | (13) | (13) | (13)
Change, net of tax | 0 | 0 | 0
Balance | (13) | (13) | (13)
Balance, tax | 0 | 0 | 0
Change, tax | 0 | 0 | 0
Balance, tax | 0 | 0 | 0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Balance | 7,632 | (348) | (8,784)
Change, net of tax | (12,307) | 7,980 | 8,436
Balance | (4,675) | 7,632 | (348)
Balance, tax | 0 | 0 | 0
Change, tax | 4,689 | 0 | 0
Balance, tax | 4,689 | 0 | 0
Accumulated Defined Benefit Plans Adjustment, Net Transition Attributable to Parent [Member] |  |  |
Balance | (40,508) | (36,949) | (33,672)
Change, net of tax | 16,740 | (3,559) | (3,277)
Balance | (23,768) | (40,508) | (36,949)
Balance, tax | 12,575 | 12,575 | 12,575
Change, tax | (6,379) | 0 | 0
Balance, tax | 6,196 | 12,575 | 12,575
AOCI Attributable to Parent [Member] |  |  |
Balance | (32,889) | (37,310) | (42,469)
Change, net of tax | 4,433 | 4,421 | 5,159
Balance | (28,456) | (32,889) | (37,310)
Balance, tax | 12,575 | 12,575 | 12,575
Change, tax | (1,690) | 0 | 0
Balance, tax | $ 10,885 | $ 12,575 | $ 12,575

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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569616-111683 + Details
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