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Note 3 - Debt Securities (Tables) | 3 Months Ended
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Mar. 31, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2023 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 1,500 |  |  | $ | - |  |  | $ | (9 | ) |  | $ | 1,491 |
U.S. Treasury Notes |  |  | 174,052 |  |  |  | 3 |  |  |  | (3,369 | ) |  |  | 170,686 |
Municipal securities |  |  | 23,012 |  |  |  | 25 |  |  |  | (80 | ) |  |  | 22,957 |
Corporate notes |  |  | 31,543 |  |  |  | - |  |  |  | (1,764 | ) |  |  | 29,779 |
Agency mortgage-backed securities |  |  | 94,780 |  |  |  | 4 |  |  |  | (11,428 | ) |  |  | 83,356 |
Total |  | $ | 324,887 |  |  | $ | 32 |  |  | $ | (16,650 | ) |  | $ | 308,269 |
|  | 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] |
|  | March 31, 2023 |
|  | Amortized |  |  |  |  |
(Amounts in thousands) |  | Cost |  |  | Fair Value |
Available-for-sale debt securities |  |  |  |  |  |  |  |
Due within one year |  | $ | 157,230 |  |  | $ | 154,233 |
Due after one year but within five years |  |  | 70,343 |  |  |  | 68,145 |
Due after five years but within ten years |  |  | 2,534 |  |  |  | 2,535 |
|  |  | 230,107 |  |  |  | 224,913 |
Agency mortgage-backed securities |  |  | 94,780 |  |  |  | 83,356 |
Total debt securities available for sale |  | $ | 324,887 |  |  | $ | 308,269 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | March 31, 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 |  | $ | 1,491 |  |  | $ | (9 | ) |  | $ | - |  |  | $ | - |  |  | $ | 1,491 |  |  | $ | (9 | )
U.S. Treasury Notes |  |  | 54,208 |  |  |  | (554 | ) |  |  | 106,906 |  |  |  | (2,815 | ) |  |  | 161,114 |  |  |  | (3,369 | )
Municipal securities |  |  | 7,463 |  |  |  | (60 | ) |  |  | 1,169 |  |  |  | (20 | ) |  |  | 8,632 |  |  |  | (80 | )
Corporate notes |  |  | 2,972 |  |  |  | (28 | ) |  |  | 26,807 |  |  |  | (1,736 | ) |  |  | 29,779 |  |  |  | (1,764 | )
Agency mortgage-backed securities |  |  | 10,009 |  |  |  | (513 | ) |  |  | 73,212 |  |  |  | (10,915 | ) |  |  | 83,221 |  |  |  | (11,428 | )
Total |  | $ | 76,143 |  |  | $ | (1,164 | ) |  | $ | 208,094 |  |  | $ | (15,486 | ) |  | $ | 284,237 |  |  | $ | (16,650 | )
|  | 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 | )

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