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Note 8 - Loans (Details Textual) - USD ($) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017
Impaired Financing Receivable, Recorded Investment, Total | $ 137,214,000 |  | $ 117,353,000 |
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 6.50% |  | 7.20% |
Allowance for Credit Losses, Change in Method of Calculating Impairment |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | 0 |  |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | 0 |  |  |
Minimum [Member] |  |  |  |
Period Loan Is In Payment Default |  | 60 days |  |
Maximum [Member] |  |  |  |
Period Loan Is In Payment Default |  | 90 days |  |
Nonaccrual Loans [Member] |  |  |  |
Impaired Financing Receivable, Recorded Investment, Total | 52,700,000 |  | $ 48,800,000 |
Accruing Troubled Debt Restructuring [Member] |  |  |  |
Impaired Financing Receivable, Recorded Investment, Total | 84,500,000 |  | 68,600,000 |
Financing Receivable, Modifications, Recorded Investment | 84,500,000 |  | 68,600,000 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 1,100,000 |  | 1,900,000 |
Non-accruing Troubled Debt Restructuring [Member] |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 30,300,000 |  | 33,400,000 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | $ 71,000 |  | $ 83,000 |

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- Definition Percentage of charge-off to contractual balances for impaired loans. + References No definition available. + Details
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- Definition Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings. + References No definition available. + 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 Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + 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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- Definition Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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