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v3.23.3

Note 2 - Investment Securities (Details Textual) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Mar. 07, 2022 USD ($)
Debt Securities, Held-to-Maturity, Number of Securities |  | 0 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Ending Balance |  | $ 0 |  |  |
Debt Securities, Held-to-Maturity, Nonaccrual |  | 0 |  | $ 0 |
Debt Securities, Available-for-sale, Number of Positions Sold | 3 |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 2,000,000 | 0 | $ 2,111,000 |  |
Debt Securities, Available-for-Sale, Gain (Loss), Total | $ (92,000) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance |  | $ 0 |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  | 543 |  | 547 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Percentage |  | 99.00% |  | 98.00% |
Collateral Pledged [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Restricted |  | $ 688,000,000 |  | $ 1,100,000,000 |
Commonwealth [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  |  |  |  | $ 247,000,000
Other Assets [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss |  | 4,000,000 |  | 4,000,000 |
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss |  | $ 1,000,000 |  | $ 2,000,000 |

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