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Note 4 - Credit Quality (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Percentage of Loan Loss Covered by FDIC | 80.00% |  |  |
Financing Receivable, Collectively Evaluated for Impairment | $ 1,718,888 |  | $ 1,758,011 |
Loans Deemed to be Impaired, Threshold |  | $ 500 |  | $ 250
Restructured Loans, Reserves | $ 250 |  |  |
Performing Status Returned Period | 180 days |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 | $ 0 |  |
Impaired Loans [Member] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 24,410 |  | 25,270 |
Non-covered Loans [Member] |  |  |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 156 |  | 58 |
Covered Loans [Member] |  |  |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 |  | $ 0 |

X
- Definition The quarterly review threshold for reviews of loans that are deemed to be impaired. + References No definition available. + Details
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X
- Definition Represents the percentage of loan covered by the FDIC. + References No definition available. + Details
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X
- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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X
- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524 + Details
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- Definition Amount of financing receivable 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 + Details
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