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Note 5 - Loans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Servicing Asset, Total | $ 300,500,000 |  |
Impaired Financing Receivable, Recorded Investment, Total | 106,886,000 | $ 117,353,000 |
Impaired Financing Receivable, Average Recorded Investment, Total | 122,596,000 | 127,067,000 | $ 131,019,000
Impaired Financing Receivable, Interest Income, Accrual Method, Total | $ 3,166,000 | $ 3,302,000 | 3,462,000
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 9.30% | 7.20% |
Allowance for Credit Losses, Change in Method of Calculating Impairment | $ 1,518,000 | $ 1,556,000 | 1,780,000
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 | $ 41,800,000 | 48,800,000 |
Accruing Troubled Debt Restructuring [Member] |  |  |
Impaired Financing Receivable, Recorded Investment, Total | 65,100,000 | 68,600,000 |
Financing Receivable, Modifications, Recorded Investment | 65,100,000 | 68,600,000 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 1,500,000 | 1,900,000 |
Non-accruing Troubled Debt Restructuring [Member] |  |  |
Financing Receivable, Modifications, Recorded Investment | 24,200,000 | 33,400,000 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 826,000 | 83,000 |
Residential Portfolio Segment [Member] |  |  |
Servicing Asset, Total | 103,200,000 |  |
Repossessed Assets, Total | 862,000 | 3,500,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Servicing Asset, Total | 50,800,000 |  |
Impaired Financing Receivable, Average Recorded Investment, Total | 57,596,000 | 58,635,000 | 81,905,000
Impaired Financing Receivable, Interest Income, Accrual Method, Total | 2,125,000 | 1,618,000 | 2,214,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | 111,000 | 1,496,000 | 34,000
Commercial Construction Loans [Member] |  |  |
Servicing Asset, Total | 105,900,000 |  |
Commercial Portfolio Segment [Member] |  |  |
Servicing Asset, Total | 40,600,000 |  |
Impaired Financing Receivable, Average Recorded Investment, Total | 44,486,000 | 26,957,000 | 21,199,000
Impaired Financing Receivable, Interest Income, Accrual Method, Total | 685,000 | 1,303,000 | 767,000
Allowance for Credit Losses, Change in Method of Calculating Impairment | 1,384,000 | 7,000 | $ 1,746,000
Real Estate Loan [Member] |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 9,700,000,000 | 8,400,000,000 |
Commercial Loans [Member] |  |  |
Loans Pledged with Federal Reserve Bank | $ 21,200,000 | $ 36,100,000 |

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