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Note 5 - Loans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Servicing Asset, Total | $ 181,400,000 | $ 141,500,000 |
Impaired Financing Receivable, Recorded Investment | 68,854,000 | 65,846,000 |
Impaired Financing Receivable, Average Recorded Investment | 71,371,000 | 72,740,000 |
Impaired Financing Receivable, Interest Income, Accrual Method | $ 435,000 | $ 1,074,000 | $ 1,000,000.0
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 14.10% | 10.70% |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | $ 427,000 | $ 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 0 |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 0 |  |
Minimum [Member] |  |  |
Period Loan Is In Payment Default (Day) | 60 days |  |
Maximum [Member] |  |  |
Period Loan Is In Payment Default (Day) | 90 days |  |
Nonaccrual Loans [Member] |  |  |
Impaired Financing Receivable, Recorded Investment | $ 68,900,000 | 65,800,000 |
Accruing Troubled Debt Restructuring [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring | 15,100,000 | 12,800,000 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | 0 | 7,000 |
Non-accruing Troubled Debt Restructuring [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring | 6,300,000 | 8,200,000 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | 427,000 | 3,000 |
Residential Portfolio Segment [Member] |  |  |
Servicing Asset, Total | 80,200,000 | 92,100,000 |
Repossessed Assets, Total | 456,000 | 2,000,000.0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Servicing Asset, Total | 51,600,000 | 17,000,000.0 |
Impaired Financing Receivable, Average Recorded Investment | 28,983,000 | 38,047,000 |
Impaired Financing Receivable, Interest Income, Accrual Method | 405,000 | 1,044,000 |
Commercial Construction Loans [Member] |  |  |
Servicing Asset, Total | 2,500,000 | 30,100,000 |
Commercial Portfolio Segment [Member] |  |  |
Servicing Asset, Total | 47,100,000 | 2,300,000 |
Impaired Financing Receivable, Average Recorded Investment | 28,109,000 | 21,453,000 |
Impaired Financing Receivable, Interest Income, Accrual Method | 4,000 | 0 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | 427,000 | 0 | $ 0
Real Estate Loan [Member] |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 13,070,000,000.00 | 11,540,000,000 |
Commercial Loans [Member] |  |  |
Loans Pledged with Federal Reserve Bank | $ 583,000 | $ 773,000,000 |

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