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Note 5 - Credit Quality (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Percentage of Loan Loss Covered by FDIC |  | 80.00% |  |
Financing Receivable, Collectively Evaluated for Impairment |  | $ 1,758,011 |  | $ 1,785,574
Loans Deemed to be Impaired, Threshold |  |  | $ 500 | 250
Impaired Financing Receivable, Recorded Investment, Total | [1] | 33,008 |  | 33,301
Restructured Loans, Reserves |  | $ 250 |  |
Performing Status Returned Period |  | 180 days |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 9,008 |  | 9,663
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Impaired Financing Receivable, Recorded Investment, Total |  | 0 |  | 0
Impaired Loans [Member] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 25,270 |  | 20,130
Non-covered Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing |  | 58 |  | 1
Covered Loans [Member] |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 0 |  | $ 0
[1] | Total impaired loans include loans totaling $25.27 million as of December 31, 2018, and $20.13 million as of December 31, 2017, that do not meet the Company's evaluation threshold for individual impairment and are therefore collectively evaluated for impairment. During the first quarter of 2018, the Company changed the threshold for quarterly reviews of individual loans that are deemed to be impaired from $250 thousand to $500 thousand or greater.

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- Definition The quarterly review threshold for reviews of loans that are deemed to be impaired. + References No definition available. + Details
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- 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=84173941&loc=SL6953423-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: 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=84173941&loc=d3e5111-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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