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Note 4 - Loans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Servicing Asset, Total | $ 141,200,000 |  |
Impaired Financing Receivable, Recorded Investment, Total | 65,846,000 | $ 95,405,000 |
Impaired Financing Receivable, Average Recorded Investment, Total | 72,740,000 | 91,353,000 |
Impaired Financing Receivable, Interest Income, Accrual Method, Total | $ 1,074,000 | $ 2,394,000 |
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 10.70% | 7.10% |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | $ 0 | $ 0 | $ 2,190,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 0 |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 0 |  |
Loans and Leases Receivable, Gross, Total | 16,342,479,000 | 15,644,396,000 |
Loans and Leases Receivable, Allowance, Ending Balance | $ 136,157,000 | 166,538,000 |
SBA's Paycheck Protection Program [Member] |  |  |
Financing Receivable, Number of Contracts | 671 |  |
Loans and Leases Receivable, Gross, Total | $ 90,500,000 |  |
Loans and Leases Receivable, Forgiven | 337,000,000.0 |  |
Loans and Leases Receivable, Allowance, Ending Balance | $ 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, Total | $ 65,800,000 | 67,700,000 |
Accruing Troubled Debt Restructuring [Member] |  |  |
Impaired Financing Receivable, Recorded Investment, Total |  | 27,700,000 |
Financing Receivable, Troubled Debt Restructuring | 12,800,000 | 27,700,000 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | 7,000 | 122,000 |
Non-accruing Troubled Debt Restructuring [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring | 8,200,000 | 9,000,000.0 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | 3,000 | 24,000 |
Residential Portfolio Segment [Member] |  |  |
Servicing Asset, Total | 92,100,000 |  |
Repossessed Assets, Total | 2,000.0 | 808,000 |
Loans and Leases Receivable, Gross, Total | 4,182,006,000 | 4,145,389,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Servicing Asset, Total | 17,000,000.0 |  |
Impaired Financing Receivable, Average Recorded Investment, Total | 38,047,000 | 41,649,000 |
Impaired Financing Receivable, Interest Income, Accrual Method, Total | 1,044,000 | 1,602,000 |
Loans and Leases Receivable, Gross, Total | $ 8,143,272,000 | 7,555,027,000 |
Loans and Leases Receivable, Allowance, Ending Balance |  | 49,205,000 |
Financing Receivable, Number of Contracts with Approved Forbearance Requests | 7 |  |
Loans and Leases Receivable with Approved Forbearance Requests, Gross | $ 49,400,000 |  |
Financing Receivable with Modifications, Percentage of Total Commercial Real Estate Loans | 0.60% |  |
Commercial Construction Loans [Member] |  |  |
Servicing Asset, Total | $ 30,100,000 |  |
Commercial Portfolio Segment [Member] |  |  |
Servicing Asset, Total | 2,300,000 |  |
Impaired Financing Receivable, Average Recorded Investment, Total | 21,453,000 | 31,009,000 |
Impaired Financing Receivable, Interest Income, Accrual Method, Total | 0 | 246,000 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | 0 | 0 | $ 2,190,000
Loans and Leases Receivable, Gross, Total | $ 2,982,399,000 | 2,836,833,000 |
Loans and Leases Receivable, Allowance, Ending Balance |  | 68,742,000 |
Financing Receivable, Number of Contracts with Approved Forbearance Requests | 4 |  |
Loans and Leases Receivable with Approved Forbearance Requests, Gross | $ 20,500,000 |  |
Financing Receivable with Modifications, Percentage of Total Commercial Real Estate Loans | 0.70% |  |
Real Estate Loan [Member] |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | $ 11,500,000 | 11,200,000,000 |
Commercial Loans [Member] |  |  |
Loans Pledged with Federal Reserve Bank | $ 773,000,000 | $ 7,500,000 |

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- Definition Amount before allowance of loans and leases held in portfolio with approved forbearance requests, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + 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=123577603&loc=SL6953550-111524 + Details
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