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Note 5 - Loans (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Servicing Asset | $ 367,600 |  |
Impaired Financing Receivable, Recorded Investment | 115,074 | $ 133,810 |
Impaired Financing Receivable, Average Recorded Investment | 131,019 | 162,945 | $ 190,226
Impaired Financing Receivable, Interest Income, Accrual Method | $ 3,462 | $ 3,997 | 5,339
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 8.40% | 22.40% |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 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 | $ 49,700 | $ 52,100 |
Accruing Troubled Debt Restructuring [Member] |  |  |
Impaired Financing Receivable, Recorded Investment | 65,400 | 81,700 |
Financing Receivable, Modifications, Recorded Investment | 65,400 | 81,700 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 1,300 | 2,000 |
Non-accruing Troubled Debt Restructuring [Member] |  |  |
Financing Receivable, Modifications, Recorded Investment | 29,700 | 39,900 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 1,100 | 5,400 |
Residential Portfolio Segment [Member] |  |  |
Servicing Asset | 133,300 |  |
Repossessed Assets | 3,600 | 2,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Servicing Asset | 112,800 |  |
Impaired Financing Receivable, Average Recorded Investment | 81,905 | 100,118 | 114,248
Impaired Financing Receivable, Interest Income, Accrual Method | 2,214 | 2,708 | 3,735
Commercial Construction Loans [Member] |  |  |
Servicing Asset | 83,100 |  |
Commercial Portfolio Segment [Member] |  |  |
Servicing Asset | 38,400 |  |
Impaired Financing Receivable, Average Recorded Investment | 21,199 | 23,960 | 26,128
Impaired Financing Receivable, Interest Income, Accrual Method | 767 | 546 | $ 878
Real Estate Loan [Member] |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 7,800,000 | 6,800,000 |
Commercial Loans [Member] |  |  |
Loans Pledged with Federal Reserve Bank | $ 30,000 | $ 71,300 |

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