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Note 8 - Deposits (Details Textual) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Deposit Liabilities, Accrued Interest | $ 10.5 | $ 4.4 | $ 2.9
Geographic Distribution, Domestic [Member] |  |  |
Time Deposits, at or Above FDIC Insurance Limit | 2,800.0 | 1,900.0 |
Geographic Distribution, Foreign [Member] |  |  |
Time Deposits, at or Above FDIC Insurance Limit | $ 174.4 | $ 152.0 |

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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=6876686&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=50488274&loc=d3e64164-112818 + Details
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