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Note 11 - Borrowing Arrangements (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, before Allowance for Credit Loss |  | $ 3,053,230 | $ 3,031,861 |
Advances from Federal Home Loan Banks, Total |  | 200,000 | 150,000 |
Other Financial Institutions [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 97,000 |  |
Federal Home Loan Bank Overnight Advances [Member] |  |  |  |
Long-Term Federal Home Loan Bank Advances |  | 0 |  |
Advances from Federal Home Loan Banks, Total |  | 0 |  |
Federal Home Loan Bank Secured Line of Credit [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,100 |  |
Federal Home Loan Bank Secured Line of Credit [Member] | Asset Pledged as Collateral [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,400 |  |
Federal Home Loan Bank of San Francisco [Member] |  |  |  |
Long-Term Federal Home Loan Bank Advances |  | 200,000 |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities |  | 2,200 | $ 2,900 | $ 2,900
Federal Home Loan Bank of San Francisco [Member] | Putable Advances [Member] |  |  |  |
Long-Term Federal Home Loan Bank Advances | $ 50,000 |  |  |
Debt Instrument, Term (Year) | 4 years |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank, Interest Rate | 3.42% |  |  |
Federal Home Loan Bank of San Francisco [Member] | Debt Instrument, Maturing 2025 [Member] |  |  |  |
Long-Term Federal Home Loan Bank Advances |  | $ 150,000 |  |
Debt Instrument, Term (Year) |  | 5 years |  |
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate at Period End |  |  | 1.18% |
Federal Home Loan Bank of San Francisco Secured Line of Credit [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 47,200 |  |
Federal Home Loan Bank of San Francisco Secured Line of Credit [Member] | Asset Pledged as Collateral [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 62,500 |  |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- Definition Rate of interest applicable on advance from Federal Home Loan Bank (FHLBank). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-2 + Details
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