Note 4 - Investment Securities (Tables)
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9 Months Ended |
Sep. 30, 2026 |
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| 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, 2026 | | | | | | | | | | | | | | | | | | | | |
Available-for-sale securities: | | | | | | | | | | | | | | | | | | | | |
Federal agency obligations | | $ | 320,151 | | | $ | 143 | | | $ | (16,457 | ) | | $ | 303,837 | | | $ | - | |
Residential mortgage pass-through securities | | | 871,749 | | | | - | | | | (87,088 | ) | | | 784,661 | | | | - | |
Commercial mortgage pass-through securities | | | 35,008 | | | | - | | | | (5,629 | ) | | | 29,379 | | | | - | |
Obligations of U.S. states and political subdivisions | | | 204,618 | | | | 24 | | | | (26,346 | ) | | | 178,296 | | | | - | |
Corporate bonds and notes | | | 26,250 | | | | - | | | | (616 | ) | | | 25,634 | | | | - | |
Asset-backed securities | | | 478 | | | | 1 | | | | (1 | ) | | | 478 | | | | - | |
Other securities | | | 1,504 | | | | - | | | | - | | | | 1,504 | | | | - | |
Total available-for-sale securities | | $ | 1,459,758 | | | $ | 168 | | | $ | (136,137 | ) | | $ | 1,323,789 | | | $ | - | |
| | | | | | | | | | | | | | | | | | | | |
December 31, 2025 | | | | | | | | | | | | | | | | | | | | |
Available-for-sale securities: | | | | | | | | | | | | | | | | | | | | |
Federal agency obligations | | $ | 398,392 | | | $ | 2,467 | | | $ | (9,669 | ) | | $ | 391,190 | | | $ | - | |
Residential mortgage pass-through securities | | | 644,811 | | | | 5,391 | | | | (43,058 | ) | | | 607,144 | | | | - | |
Commercial mortgage pass-through securities | | | 30,124 | | | | - | | | | (3,155 | ) | | | 26,969 | | | | - | |
Obligations of U.S. states and political subdivisions | | | 221,545 | | | | 5,385 | | | | (14,521 | ) | | | 212,409 | | | | - | |
Corporate bonds and notes | | | 12,500 | | | | 22 | | | | (3 | ) | | | 12,519 | | | | - | |
Asset-backed securities | | | 528 | | | | - | | | | (3 | ) | | | 525 | | | | - | |
Other securities | | | 182 | | | | - | | | | - | | | | 182 | | | | - | |
Total available-for-sale securities | | $ | 1,308,082 | | | $ | 13,265 | | | $ | (70,409 | ) | | $ | 1,250,938 | | | $ | - | |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | September 30, 2026 | |
| | Amortized | | | Fair | |
| | Cost | | | Value | |
| | (dollars in thousands) | |
Available-for-sale securities | | | | | | | | |
Due in one year or less | | $ | 7,000 | | | $ | 6,980 | |
Due after one year through five years | | | 26,771 | | | | 26,162 | |
Due after five years through ten years | | | 93,834 | | | | 89,293 | |
Due after ten years | | | 423,892 | | | | 385,810 | |
Residential mortgage pass-through securities | | | 871,749 | | | | 784,661 | |
Commercial mortgage pass-through securities | | | 35,008 | | | | 29,379 | |
Other securities | | | 1,504 | | | | 1,504 | |
Total available-for-sale securities | | $ | 1,459,758 | | | $ | 1,323,789 | |
|
| Unrealized Gain (Loss) on Investments [Table Text Block] |
| | September 30, 2026 | |
| | Total | | | Less than 12 Months | | | 12 Months or Longer | |
| | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | |
| | Value | | | Losses | | | Value | | | Losses | | | Value | | | Losses | |
| | (dollars in thousands) | |
Available-for-sale securities: | | | | | | | | | | | | | | | | | | | | | | | | |
Federal agency obligations | | $ | 249,528 | | | $ | (16,457 | ) | | $ | 206,723 | | | $ | (4,883 | ) | | $ | 42,805 | | | $ | (11,574 | ) |
Residential mortgage pass-through securities | | | 784,661 | | | | (87,088 | ) | | | 514,760 | | | | (24,763 | ) | | | 269,901 | | | | (62,325 | ) |
Commercial mortgage pass-through securities | | | 29,379 | | | | (5,629 | ) | | | 5,071 | | | | (394 | ) | | | 24,308 | | | | (5,235 | ) |
Obligations of U.S. states and political subdivisions | | | 174,388 | | | | (26,346 | ) | | | 104,295 | | | | (5,870 | ) | | | 70,093 | | | | (20,476 | ) |
Corporate bonds and notes | | | 23,634 | | | | (616 | ) | | | 23,634 | | | | (616 | ) | | | - | | | | - | |
Asset-backed securities | | | 254 | | | | (1 | ) | | | - | | | | - | | | | 254 | | | | (1 | ) |
Total available-for-sale securities | | $ | 1,261,844 | | | $ | (136,137 | ) | | $ | 854,483 | | | $ | (36,526 | ) | | $ | 407,361 | | | $ | (99,611 | ) |
| | December 31, 2025 | |
| | Total | | | Less than 12 Months | | | 12 Months or Longer | |
| | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | |
| | Value | | | Losses | | | Value | | | Losses | | | Value | | | Losses | |
| | (dollars in thousands) | |
Available-for-sale securities: | | | | | | | | | | | | | | | | | | | | | | | | |
Federal agency obligations | | $ | 135,103 | | | $ | (9,669 | ) | | $ | 101,610 | | | $ | (246 | ) | | $ | 33,493 | | | $ | (9,423 | ) |
Residential mortgage pass-through securities | | | 331,799 | | | | (43,058 | ) | | | 5,547 | | | | (45 | ) | | | 326,252 | | | | (43,013 | ) |
Commercial mortgage pass-through securities | | | 26,969 | | | | (3,155 | ) | | | 5,421 | | | | (96 | ) | | | 21,548 | | | | (3,059 | ) |
Obligations of U.S. states and political subdivisions | | | 103,918 | | | | (14,521 | ) | | | 4,276 | | | | (20 | ) | | | 99,642 | | | | (14,501 | ) |
Corporate bonds and notes | | | 1,997 | | | | (3 | ) | | | 1,997 | | | | (3 | ) | | | - | | | | - | |
Asset-backed securities | | | 525 | | | | (3 | ) | | | 242 | | | | - | | | | 283 | | | | (3 | ) |
Total available-for-sale securities | | $ | 600,311 | | | $ | (70,409 | ) | | $ | 119,093 | | | $ | (410 | ) | | $ | 481,218 | | | $ | (69,999 | ) |
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