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Note 7 - Deposits (Details Textual) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Deposit Liabilities, Accrued Interest | $ 8.5 | $ 22.3 | $ 10.5
Geographic Distribution, Domestic [Member] |  |  |
Time Deposits, at or Above FDIC Insurance Limit | 2,900.0 | 3,100.0 |
Geographic Distribution, Foreign [Member] |  |  |
Time Deposits, at or Above FDIC Insurance Limit | $ 142.8 | $ 192.9 |

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- Definition Amount of accrued but unpaid interest on deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
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