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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020
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Retained Earnings (Accumulated Deficit), Ending Balance | $ 1,935,831 |  | $ 1,789,325
Loans and Leases Receivable, Allowance, Ending Balance | $ 131,945 |  | 166,538
Off-Balance Sheet, Credit Loss, Liability, Ending Balance |  |  | $ 5,880
Accounting Standards Update 2016-13 [Member] |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  | $ 3,100 |
Loans and Leases Receivable, Allowance, Ending Balance |  | 1,600 |
Off-Balance Sheet, Credit Loss, Liability, Ending Balance |  | $ 6,000 |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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