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Note 3 - Debt Securities (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2023 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 7,250 |  |  | $ | - |  |  | $ | (21 | ) |  | $ | 7,229 |
U.S. Treasury Notes |  |  | 181,670 |  |  |  | 3 |  |  |  | (3,167 | ) |  |  | 178,506 |
Municipal securities |  |  | 21,684 |  |  |  | 10 |  |  |  | (245 | ) |  |  | 21,449 |
Corporate notes |  |  | 28,551 |  |  |  | - |  |  |  | (2,088 | ) |  |  | 26,463 |
Agency mortgage-backed securities |  |  | 93,401 |  |  |  | 1 |  |  |  | (12,676 | ) |  |  | 80,726 |
Total |  | $ | 332,556 |  |  | $ | 14 |  |  | $ | (18,197 | ) |  | $ | 314,373 |
|  | 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 Notes |  |  | 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] |
|  | June 30, 2023 |
|  | Amortized |  |  |  |  |
(Amounts in thousands) |  | Cost |  |  | Fair Value |
Available-for-sale debt securities |  |  |  |  |  |  |  |
Due within one year |  | $ | 188,484 |  |  | $ | 185,298 |
Due after one year but within five years |  |  | 48,727 |  |  |  | 46,419 |
Due after five years but within ten years |  |  | 1,944 |  |  |  | 1,930 |
|  |  | 239,155 |  |  |  | 233,647 |
Agency mortgage-backed securities |  |  | 93,401 |  |  |  | 80,726 |
Total debt securities available for sale |  | $ | 332,556 |  |  | $ | 314,373 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | June 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 |  | $ | 7,228 |  |  | $ | (21 | ) |  | $ | - |  |  | $ | - |  |  | $ | 7,228 |  |  | $ | (21 | )
U.S. Treasury Notes |  |  | 40,602 |  |  |  | (84 | ) |  |  | 126,686 |  |  |  | (3,083 | ) |  |  | 167,288 |  |  |  | (3,167 | )
Municipal securities |  |  | 14,017 |  |  |  | (189 | ) |  |  | 1,403 |  |  |  | (56 | ) |  |  | 15,420 |  |  |  | (245 | )
Corporate notes |  |  | - |  |  |  | - |  |  |  | 26,462 |  |  |  | (2,088 | ) |  |  | 26,462 |  |  |  | (2,088 | )
Agency mortgage-backed securities |  |  | 3,335 |  |  |  | (204 | ) |  |  | 77,311 |  |  |  | (12,472 | ) |  |  | 80,646 |  |  |  | (12,676 | )
Total |  | $ | 65,182 |  |  | $ | (498 | ) |  | $ | 231,862 |  |  | $ | (17,699 | ) |  | $ | 297,044 |  |  | $ | (18,197 | )
|  | 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 Notes |  |  | 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 |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  | $ | - |  |  | $ | - |  |  | $ | 7 |  |  | $ | - |
Gross realized losses |  |  | (28 | ) |  |  | - |  |  |  | (28 | ) |  |  | - |
Net Gain (Loss) on sale of securities |  | $ | (28 | ) |  | $ | - |  |  | $ | (21 | ) |  | $ | - |

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