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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 54,889 |  |  | $ | - |  |  | $ | (10,439 | ) |  | $ | 44,450 |
Residential mortgage pass-through securities |  |  | 475,263 |  |  |  | 178 |  |  |  | (57,863 | ) |  |  | 417,578 |
Commercial mortgage pass-through securities |  |  | 25,485 |  |  |  | - |  |  |  | (4,381 | ) |  |  | 21,104 |
Obligations of U.S. states and political subdivisions​​ |  |  | 157,247 |  |  |  | 111 |  |  |  | (14,462 | ) |  |  | 142,896 |
Corporate bonds and notes |  |  | 7,000 |  |  |  | - |  |  |  | (26 | ) |  |  | 6,974 |
Asset-backed securities |  |  | 1,673 |  |  |  | - |  |  |  | (33 | ) |  |  | 1,640 |
Other securities |  |  | 242 |  |  |  | - |  |  |  | - |  |  |  | 242 |
Total securities available-for-sale |  | $ | 721,799 |  |  | $ | 289 |  |  | $ | (87,204 | ) |  | $ | 634,884 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (dollars in thousands) |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 50,336 |  |  | $ | 649 |  |  | $ | (625 | ) |  | $ | 50,360 |
Residential mortgage pass-through securities |  |  | 317,111 |  |  |  | 1,868 |  |  |  | (2,884 | ) |  |  | 316,095 |
Commercial mortgage pass-through securities |  |  | 10,814 |  |  |  | 118 |  |  |  | (463 | ) |  |  | 10,469 |
Obligations of U.S. states and political subdivisions​​ |  |  | 145,045 |  |  |  | 1,562 |  |  |  | (982 | ) |  |  | 145,625 |
Corporate bonds and notes |  |  | 8,968 |  |  |  | 81 |  |  |  | - |  |  |  | 9,049 |
Asset-backed securities |  |  | 2,563 |  |  |  | 3 |  |  |  | (2 | ) |  |  | 2,564 |
Certificates of deposit |  |  | 150 |  |  |  | - |  |  |  | - |  |  |  | 150 |
Other securities |  |  | 195 |  |  |  | - |  |  |  | - |  |  |  | 195 |
Total securities available-for-sale |  | $ | 535,182 |  |  | $ | 4,281 |  |  | $ | (4,956 | ) |  | $ | 534,507 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | December 31, 2022 |
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
|  | (dollars in thousands) |
Investment securities available-for-sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 5,453 |  |  | $ | 5,451 |
Due after one year through five years |  |  | 4,106 |  |  |  | 4,082 |
Due after five years through ten years |  |  | 2,247 |  |  |  | 2,244 |
Due after ten years |  |  | 209,003 |  |  |  | 184,183 |
Residential mortgage pass-through securities |  |  | 475,263 |  |  |  | 417,578 |
Commercial mortgage pass-through securities |  |  | 25,485 |  |  |  | 21,104 |
Other securities |  |  | 242 |  |  |  | 242 |
Total securities available-for-sale |  | $ | 721,799 |  |  | $ | 634,884 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  | (dollars in thousands) |
Proceeds |  | $ | - |  |  | $ | 5,185 |  |  | $ | 19,624 |
Gross gains on sale/redemption of investment securities |  | $ | - |  |  | $ | 195 |  |  | $ | 29 |
Gross losses on sale/redemption of investment securities |  |  | - |  |  |  | - |  |  |  | - |
Net gains on sales/redemptions of investment securities​​ |  |  | - |  |  |  | 195 |  |  |  | 29 |
Tax provision on net gains |  |  | - |  |  |  | (48 | ) |  |  | (6 | )
Net gains on sale/redemption of investment securities, after tax​​ |  | $ | - |  |  | $ | 147 |  |  | $ | 23 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | December 31, 2022 |
|  | 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 |  | $ | 44,451 |  |  | $ | (10,439 | ) |  | $ | 20,517 |  |  | $ | (1,831 | ) |  | $ | 23,934 |  |  | $ | (8,608 | )
Residential mortgage pass-through securities |  |  | 403,039 |  |  |  | (57,863 | ) |  |  | 218,918 |  |  |  | (13,869 | ) |  |  | 184,121 |  |  |  | (43,994 | )
Commercial mortgage pass-through securities |  |  | 21,105 |  |  |  | (4,381 | ) |  |  | 14,523 |  |  |  | (2,304 | ) |  |  | 6,582 |  |  |  | (2,077 | )
Obligations of U.S. states and political subdivisions |  |  | 133,265 |  |  |  | (14,462 | ) |  |  | 47,446 |  |  |  | (3,404 | ) |  |  | 85,819 |  |  |  | (11,058 | )
Corporate bonds and notes |  |  | 4,973 |  |  |  | (26 | ) |  |  | 4,973 |  |  |  | (26 | ) |  |  | - |  |  |  | - |
Asset-backed securities |  |  | 1,640 |  |  |  | (33 | ) |  |  | 1,048 |  |  |  | (16 | ) |  |  | 592 |  |  |  | (17 | )
Total temporarily impaired securities |  | $ | 608,473 |  |  | $ | (87,204 | ) |  | $ | 307,425 |  |  | $ | (21,450 | ) |  | $ | 301,048 |  |  | $ | (65,754 | )
|  | December 31, 2021 |
|  | 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 |  | $ | 28,974 |  |  | $ | (625 | ) |  | $ | 28,974 |  |  | $ | (625 | ) |  | $ | - |  |  | $ | - |
Residential mortgage pass-through securities |  |  | 246,396 |  |  |  | (2,884 | ) |  |  | 214,701 |  |  |  | (2,111 | ) |  |  | 31,695 |  |  |  | (773 | )
Commercial mortgage pass-through securities |  |  | 8,370 |  |  |  | (463 | ) |  |  | 4,682 |  |  |  | (75 | ) |  |  | 3,688 |  |  |  | (388 | )
Obligations of U.S. states and political subdivisions |  |  | 89,473 |  |  |  | (982 | ) |  |  | 89,473 |  |  |  | (982 | ) |  |  | - |  |  |  | - |
Asset-backed securities |  |  | 802 |  |  |  | (2 | ) |  |  | 802 |  |  |  | (2 | ) |  |  | - |  |  |  | - |
Total temporarily impaired securities |  | $ | 374,015 |  |  | $ | (4,956 | ) |  | $ | 338,632 |  |  | $ | (3,795 | ) |  | $ | 35,383 |  |  | $ | (1,161 | )

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