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Note 3 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2022
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) |
September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 55,896 |  |  | $ | - |  |  | $ | (10,276 | ) |  | $ | 45,620 |  |  | $ | - |
Residential mortgage pass-through securities |  |  | 468,783 |  |  |  | - |  |  |  | (61,798 | ) |  |  | 406,985 |  |  |  | - |
Commercial mortgage pass-through securities |  |  | 25,546 |  |  |  | - |  |  |  | (4,651 | ) |  |  | 20,895 |  |  |  | - |
Obligations of U.S. states and political subdivisions |  |  | 159,441 |  |  |  | 46 |  |  |  | (18,380 | ) |  |  | 141,107 |  |  |  | - |
Corporate bonds and notes |  |  | 6,998 |  |  |  | - |  |  |  | (8 | ) |  |  | 6,990 |  |  |  | - |
Asset-backed securities |  |  | 1,934 |  |  |  | - |  |  |  | (36 | ) |  |  | 1,898 |  |  |  |  |
Other securities |  |  | 134 |  |  |  | - |  |  |  | - |  |  |  | 134 |  |  |  | - |
Total securities available-for-sale |  | $ | 718,732 |  |  | $ | 46 |  |  | $ | (95,149 | ) |  | $ | 623,629 |  |  | $ | - |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |
|  | September 30, 2022 |
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
|  | (dollars in thousands) |
Securities available-for-sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 5,451 |  |  | $ | 5,444 |
Due after one year through five years |  |  | 4,106 |  |  |  | 4,107 |
Due after five years through ten years |  |  | 2,342 |  |  |  | 2,289 |
Due after ten years |  |  | 212,370 |  |  |  | 183,775 |
Residential mortgage pass-through securities |  |  | 468,783 |  |  |  | 406,985 |
Commercial mortgage pass-through securities |  |  | 25,546 |  |  |  | 20,895 |
Other securities |  |  | 134 |  |  |  | 134 |
Total securities available-for-sale |  | $ | 718,732 |  |  | $ | 623,629 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
|  | (dollars in thousands) |
Proceeds |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 5,185 |
Gross gains on sales/redemptions of securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 195 |
Gross losses on sales/redemptions of securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net gain on sales/redemptions of securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 195 |
Less: tax provision on net gain |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (48 | )
Net gain on sales/redemptions of securities, after taxes |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 147 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | September 30, 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) |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 45,620 |  |  | $ | (10,276 | ) |  | $ | 30,535 |  |  | $ | (4,261 | ) |  | $ | 15,085 |  |  | $ | (6,015 | )
Residential mortgage pass-through securities |  |  | 406,984 |  |  |  | (61,798 | ) |  |  | 293,070 |  |  |  | (32,342 | ) |  |  | 113,914 |  |  |  | (29,456 | )
Commercial mortgage pass-through securities |  |  | 20,895 |  |  |  | (4,651 | ) |  |  | 15,961 |  |  |  | (2,943 | ) |  |  | 4,934 |  |  |  | (1,708 | )
Obligations of U.S. states and political subdivisions |  |  | 135,483 |  |  |  | (18,380 | ) |  |  | 81,466 |  |  |  | (11,098 | ) |  |  | 54,017 |  |  |  | (7,282 | )
Corporate bonds and notes |  |  | 2,991 |  |  |  | (8 | ) |  |  | 2,991 |  |  |  | (8 | ) |  |  | - |  |  |  | - |
Asset-backed securities |  |  | 1,898 |  |  |  | (36 | ) |  |  | 1,242 |  |  |  | (16 | ) |  |  | 656 |  |  |  | (20 | )
Total temporarily impaired securities |  | $ | 613,871 |  |  | $ | (95,149 | ) |  | $ | 425,265 |  |  | $ | (50,668 | ) |  | $ | 188,606 |  |  | $ | (44,481 | )
|  | 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) |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 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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