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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (dollars in thousands) |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 96,165 |  |  | $ | 179 |  |  | $ | (11,674 | ) |  | $ | 84,670 |
Residential mortgage pass-through securities |  |  | 439,445 |  |  |  | 211 |  |  |  | (60,818 | ) |  |  | 378,838 |
Commercial mortgage pass-through securities |  |  | 24,989 |  |  |  | - |  |  |  | (4,097 | ) |  |  | 20,892 |
Obligations of U.S. states and political subdivisions​​ |  |  | 141,775 |  |  |  | 89 |  |  |  | (19,460 | ) |  |  | 122,404 |
Corporate bonds and notes |  |  | 5,000 |  |  |  | 5 |  |  |  | (18 | ) |  |  | 4,987 |
Asset-backed securities |  |  | 892 |  |  |  | - |  |  |  | (7 | ) |  |  | 885 |
Other securities |  |  | 171 |  |  |  | - |  |  |  | - |  |  |  | 171 |
Total investment securities available-for-sale |  | $ | 708,437 |  |  | $ | 484 |  |  | $ | (96,074 | ) |  | $ | 612,847 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (dollars in thousands) |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 55,898 |  |  | $ | 189 |  |  | $ | (10,761 | ) |  | $ | 45,326 |
Residential mortgage pass-through securities |  |  | 462,004 |  |  |  | 620 |  |  |  | (51,433 | ) |  |  | 411,191 |
Commercial mortgage pass-through securities |  |  | 25,240 |  |  |  | - |  |  |  | (3,676 | ) |  |  | 21,564 |
Obligations of U.S. states and political subdivisions​​ |  |  | 148,795 |  |  |  | 415 |  |  |  | (16,505 | ) |  |  | 132,705 |
Corporate bonds and notes |  |  | 5,000 |  |  |  | - |  |  |  | (27 | ) |  |  | 4,973 |
Asset-backed securities |  |  | 1,260 |  |  |  | - |  |  |  | (22 | ) |  |  | 1,238 |
Other securities |  |  | 165 |  |  |  | - |  |  |  | - |  |  |  | 165 |
Total investment securities available-for-sale |  | $ | 698,362 |  |  | $ | 1,224 |  |  | $ | (82,424 | ) |  | $ | 617,162 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | December 31, 2024 |
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
|  | (dollars in thousands) |
Investment securities available-for-sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 4,034 |  |  | $ | 4,040 |
Due after one year through five years |  |  | 5,304 |  |  |  | 5,282 |
Due after five years through ten years |  |  | 10,400 |  |  |  | 9,132 |
Due after ten years |  |  | 224,094 |  |  |  | 194,492 |
Residential mortgage pass-through securities |  |  | 439,445 |  |  |  | 378,838 |
Commercial mortgage pass-through securities |  |  | 24,989 |  |  |  | 20,892 |
Other securities |  |  | 171 |  |  |  | 171 |
Total investment securities available-for-sale |  | $ | 708,437 |  |  | $ | 612,847 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | December 31, 2024 |
|  | Total |  |  | Less than 12 Months |  |  | 12 Months or Longer |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (dollars in thousands) |
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | $ | 53,467 |  |  | $ | (11,674 | ) |  | $ | 18,471 |  |  | $ | (60 | ) |  | $ | 34,996 |  |  | $ | (11,614 | )
Residential mortgage pass-through securities |  |  | 364,971 |  |  |  | (60,818 | ) |  |  | 26,809 |  |  |  | (604 | ) |  |  | 338,162 |  |  |  | (60,214 | )
Commercial mortgage pass-through securities |  |  | 20,892 |  |  |  | (4,097 | ) |  |  | - |  |  |  | - |  |  |  | 20,892 |  |  |  | (4,097 | )
Obligations of U.S. states and political subdivisions |  |  | 112,523 |  |  |  | (19,460 | ) |  |  | 13,281 |  |  |  | (322 | ) |  |  | 99,242 |  |  |  | (19,138 | )
Corporate bonds and notes |  |  | 1,982 |  |  |  | (18 | ) |  |  | 1,982 |  |  |  | (18 | ) |  |  | - |  |  |  | - |
Asset-backed securities |  |  | 885 |  |  |  | (7 | ) |  |  | - |  |  |  | - |  |  |  | 885 |  |  |  | (7 | )
Total temporarily impaired securities |  | $ | 554,720 |  |  | $ | (96,074 | ) |  | $ | 60,543 |  |  | $ | (1,004 | ) |  | $ | 494,177 |  |  | $ | (95,070 | )
|  | December 31, 2023 |
|  | Total |  |  | Less than 12 Months |  |  | 12 Months or Longer |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (dollars in thousands) |
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligation |  | $ | 40,779 |  |  | $ | (10,761 | ) |  | $ | 1,689 |  |  | $ | (65 | ) |  | $ | 39,090 |  |  | $ | (10,696 | )
Residential mortgage pass-through securities |  |  | 382,042 |  |  |  | (51,433 | ) |  |  | 4,138 |  |  |  | (51 | ) |  |  | 377,904 |  |  |  | (51,382 | )
Commercial mortgage pass-through securities |  |  | 21,565 |  |  |  | (3,676 | ) |  |  | - |  |  |  | - |  |  |  | 21,565 |  |  |  | (3,676 | )
Obligations of U.S. states and political subdivisions |  |  | 101,189 |  |  |  | (16,505 | ) |  |  | 1,340 |  |  |  | (7 | ) |  |  | 99,849 |  |  |  | (16,498 | )
Corporate bonds and notes |  |  | 4,973 |  |  |  | (27 | ) |  |  | 2,993 |  |  |  | (7 | ) |  |  | 1,980 |  |  |  | (20 | )
Asset-backed securities |  |  | 1,238 |  |  |  | (22 | ) |  |  | - |  |  |  | - |  |  |  | 1,238 |  |  |  | (22 | )
Total temporarily impaired securities |  | $ | 551,786 |  |  | $ | (82,424 | ) |  | $ | 10,160 |  |  | $ | (130 | ) |  | $ | 541,626 |  |  | $ | (82,294 | )

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