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Note 3 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Allowance |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | for |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |  | Investment |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Credit |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |  |  | Losses |
|  | (dollars in thousands) |
March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 76,953 |  |  | $ | 190 |  |  | $ | (11,411 | ) |  | $ | 65,732 |  |  | $ | - |
Residential mortgage pass-through securities |  |  | 454,980 |  |  |  | 289 |  |  |  | (58,848 | ) |  |  | 396,421 |  |  |  | - |
Commercial mortgage pass-through securities |  |  | 25,178 |  |  |  | - |  |  |  | (3,740 | ) |  |  | 21,438 |  |  |  | - |
Obligations of U.S. states and political subdivisions |  |  | 147,553 |  |  |  | 166 |  |  |  | (18,163 | ) |  |  | 129,556 |  |  |  | - |
Corporate bonds and notes |  |  | 5,000 |  |  |  | - |  |  |  | (29 | ) |  |  | 4,971 |  |  |  | - |
Asset-backed securities |  |  | 1,167 |  |  |  | - |  |  |  | (15 | ) |  |  | 1,152 |  |  |  | - |
Other securities |  |  | 127 |  |  |  | - |  |  |  | - |  |  |  | 127 |  |  |  | - |
Total investment securities available-for-sale |  | $ | 710,958 |  |  | $ | 645 |  |  | $ | (92,206 | ) |  | $ | 619,397 |  |  | $ | - |
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] |
|  | March 31, 2024 |
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
|  | (dollars in thousands) |
Investment securities available-for-sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 2,284 |  |  | $ | 2,269 |
Due after one year through five years |  |  | 6,362 |  |  |  | 6,338 |
Due after five years through ten years |  |  | 2,283 |  |  |  | 2,241 |
Due after ten years |  |  | 219,744 |  |  |  | 190,563 |
Residential mortgage pass-through securities |  |  | 454,980 |  |  |  | 396,421 |
Commercial mortgage pass-through securities |  |  | 25,178 |  |  |  | 21,438 |
Other securities |  |  | 127 |  |  |  | 127 |
Total investment securities available-for-sale |  | $ | 710,958 |  |  | $ | 619,397 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | March 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 obligations |  | $ | 49,276 |  |  | $ | (11,411 | ) |  | $ | 11,597 |  |  | $ | (93 | ) |  | $ | 37,679 |  |  | $ | (11,318 | )
Residential mortgage pass-through securities |  |  | 368,077 |  |  |  | (58,848 | ) |  |  | 3,345 |  |  |  | (77 | ) |  |  | 364,732 |  |  |  | (58,771 | )
Commercial mortgage pass-through securities |  |  | 21,437 |  |  |  | (3,740 | ) |  |  | - |  |  |  | - |  |  |  | 21,437 |  |  |  | (3,740 | )
Obligations of U.S. states and political subdivisions |  |  | 118,304 |  |  |  | (18,163 | ) |  |  | 19,806 |  |  |  | (389 | ) |  |  | 98,498 |  |  |  | (17,774 | )
Corporate bonds and notes |  |  | 4,972 |  |  |  | (29 | ) |  |  | 2,987 |  |  |  | (14 | ) |  |  | 1,985 |  |  |  | (15 | )
Asset-backed securities |  |  | 1,153 |  |  |  | (15 | ) |  |  | - |  |  |  | - |  |  |  | 1,153 |  |  |  | (15 | )
Total temporarily impaired securities |  | $ | 563,219 |  |  | $ | (92,206 | ) |  | $ | 37,735 |  |  | $ | (573 | ) |  | $ | 525,484 |  |  | $ | (91,633 | )
|  | 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 obligations |  | $ | 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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