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Note 3 - Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2023 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 5,750 |  |  | $ | - |  |  | $ | (9 | ) |  | $ | 5,741 |
U.S. Treasury securities |  |  | 146,929 |  |  |  | - |  |  |  | (2,009 | ) |  |  | 144,920 |
Municipal securities |  |  | 19,951 |  |  |  | - |  |  |  | (550 | ) |  |  | 19,401 |
Corporate notes |  |  | 28,559 |  |  |  | - |  |  |  | (2,310 | ) |  |  | 26,249 |
Agency mortgage-backed securities |  |  | 96,102 |  |  |  | - |  |  |  | (17,081 | ) |  |  | 79,021 |
Total |  | $ | 297,291 |  |  | $ | - |  |  | $ | (21,959 | ) |  | $ | 275,332 |
|  | December 31, 2022 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 1,500 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 1,485 |
U.S. Treasury securities |  |  | 161,617 |  |  |  | - |  |  |  | (4,353 | ) |  |  | 157,264 |
Municipal securities |  |  | 23,480 |  |  |  | 21 |  |  |  | (192 | ) |  |  | 23,309 |
Corporate notes |  |  | 37,046 |  |  |  | — |  |  |  | (2,189 | ) |  |  | 34,857 |
Agency mortgage-backed securities |  |  | 96,480 |  |  |  | 3 |  |  |  | (13,049 | ) |  |  | 83,434 |
Total |  | $ | 320,123 |  |  | $ | 24 |  |  | $ | (19,798 | ) |  | $ | 300,349 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | September 30, 2023 |
|  | Amortized |  |  |  |  |
(Amounts in thousands) |  | Cost |  |  | Fair Value |
Available-for-sale debt securities |  |  |  |  |  |  |  |
Due within one year |  | $ | 157,238 |  |  | $ | 155,191 |
Due after one year but within five years |  |  | 43,357 |  |  |  | 40,550 |
Due after five years but within ten years |  |  | 594 |  |  |  | 570 |
|  |  | 201,189 |  |  |  | 196,311 |
Agency mortgage-backed securities |  |  | 96,102 |  |  |  | 79,021 |
Total debt securities available for sale |  | $ | 297,291 |  |  | $ | 275,332 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | September 30, 2023 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 5,741 |  |  | $ | (9 | ) |  | $ | - |  |  | $ | - |  |  | $ | 5,741 |  |  | $ | (9 | )
U.S. Treasury securities |  |  | 11,301 |  |  |  | (39 | ) |  |  | 132,373 |  |  |  | (1,970 | ) |  |  | 143,674 |  |  |  | (2,009 | )
Municipal securities |  |  | 13,165 |  |  |  | (261 | ) |  |  | 5,391 |  |  |  | (289 | ) |  |  | 18,556 |  |  |  | (550 | )
Corporate notes |  |  | - |  |  |  | - |  |  |  | 26,249 |  |  |  | (2,310 | ) |  |  | 26,249 |  |  |  | (2,310 | )
Agency mortgage-backed securities |  |  | 4,545 |  |  |  | (167 | ) |  |  | 74,476 |  |  |  | (16,914 | ) |  |  | 79,021 |  |  |  | (17,081 | )
Total |  | $ | 34,752 |  |  | $ | (476 | ) |  | $ | 238,489 |  |  | $ | (21,483 | ) |  | $ | 273,241 |  |  | $ | (21,959 | )
|  | December 31, 2022 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 1,485 |  |  | $ | (15 | ) |  | $ | — |  |  | $ | — |  |  | $ | 1,485 |  |  | $ | (15 | )
U.S. Treasury securities |  |  | 157,264 |  |  |  | (4,353 | ) |  |  | — |  |  |  | — |  |  |  | 157,264 |  |  |  | (4,353 | )
Municipal securities |  |  | 12,347 |  |  |  | (192 | ) |  |  | — |  |  |  | — |  |  |  | 12,347 |  |  |  | (192 | )
Corporate notes |  |  | 32,368 |  |  |  | (2,172 | ) |  |  | 2,489 |  |  |  | (17 | ) |  |  | 34,857 |  |  |  | (2,189 | )
Agency mortgage-backed securities |  |  | 64,993 |  |  |  | (8,824 | ) |  |  | 18,305 |  |  |  | (4,225 | ) |  |  | 83,298 |  |  |  | (13,049 | )
Total |  | $ | 268,457 |  |  | $ | (15,556 | ) |  | $ | 20,794 |  |  | $ | (4,242 | ) |  | $ | 289,251 |  |  | $ | (19,798 | )
Realized Gain (Loss) on Investments [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  | $ | - |  |  | $ | - |  |  | $ | 7 |  |  | $ | - |
Gross realized losses |  |  | - |  |  |  | - |  |  |  | (28 | ) |  |  | - |
Net gain (loss) on sale of securities |  | $ | - |  |  | $ | - |  |  | $ | (21 | ) |  | $ | - |

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