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Note 5 - Loans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Servicing Asset | $ 384,300,000 |  |
Impaired Financing Receivable, Recorded Investment | 117,353,000 | $ 115,074,000 |
Impaired Financing Receivable, Average Recorded Investment | 127,067,000 | 131,019,000 | $ 162,945,000
Impaired Financing Receivable, Interest Income, Accrual Method | $ 3,302,000 | $ 3,462,000 | 3,997,000
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 7.20% | 8.40% |
Allowance for Credit Losses, Change in Method of Calculating Impairment | $ 1,556,000 | $ 1,780,000 | 752,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | 582,000 |  |
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 | $ 48,800,000 | 49,700,000 |
Accruing Troubled Debt Restructuring [Member] |  |  |
Impaired Financing Receivable, Recorded Investment | 68,600,000 | 65,400,000 |
Financing Receivable, Modifications, Recorded Investment | 68,600,000 | 65,400,000 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 1,900,000 | 1,300,000 |
Non-accruing Troubled Debt Restructuring [Member] |  |  |
Financing Receivable, Modifications, Recorded Investment | 33,400,000 | 29,700,000 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 83,000 | 1,100,000 |
Residential Portfolio Segment [Member] |  |  |
Servicing Asset | 116,900,000 |  |
Repossessed Assets | 3,500,000 | 3,600,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Servicing Asset | 87,700,000 |  |
Impaired Financing Receivable, Average Recorded Investment | 58,635,000 | 81,905,000 | 100,118,000
Impaired Financing Receivable, Interest Income, Accrual Method | 1,618,000 | 2,214,000 | 2,708,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | 1,496,000 | 34,000 | 708,000
Commercial Construction Loans [Member] |  |  |
Servicing Asset | 138,300,000 |  |
Commercial Portfolio Segment [Member] |  |  |
Servicing Asset | 41,400,000 |  |
Impaired Financing Receivable, Average Recorded Investment | 26,957,000 | 21,199,000 | 23,960,000
Impaired Financing Receivable, Interest Income, Accrual Method | 1,303,000 | 767,000 | 546,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | 7,000 | 1,746,000 | $ 2,000
Real Estate Loan [Member] |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 8,400,000,000 | 7,800,000,000 |
Commercial Loans [Member] |  |  |
Loans Pledged with Federal Reserve Bank | $ 36,100,000 | $ 30,000,000 |

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