Note 3 - Securities (Tables)
|
6 Months Ended |
Jun. 30, 2025 |
|---|
| Notes Tables |
|
| Debt Securities, Available-for-Sale [Table Text Block] |
| | | | | | | Gross | | | Gross | | | | | |
| | | Amortized | | | Unrealized | | | Unrealized | | | | | |
| (In Thousands of Dollars) | | Cost | | | Gains | | | Losses | | | Fair Value | |
| June 30, 2025 | | | | | | | | | | | | | | | | |
| U.S. Treasury and U.S. government sponsored entities | | $ | 121,056 | | | $ | 26 | | | $ | (11,845 | ) | | $ | 109,237 | |
| State and political subdivisions | | | 594,437 | | | | 1,210 | | | | (109,647 | ) | | | 486,000 | |
| Corporate bonds | | | 17,569 | | | | 210 | | | | (504 | ) | | | 17,275 | |
| Mortgage-backed securities | | | 605,297 | | | | 394 | | | | (96,746 | ) | | | 508,945 | |
| Collateralized mortgage obligations | | | 157,115 | | | | 438 | | | | (6,384 | ) | | | 151,169 | |
| Small Business Administration | | | 2,455 | | | | 0 | | | | (182 | ) | | | 2,273 | |
| Totals | | $ | 1,497,929 | | | $ | 2,278 | | | $ | (225,308 | ) | | $ | 1,274,899 | |
| | | | | | | Gross | | | Gross | | | | | |
| | | Amortized | | | Unrealized | | | Unrealized | | | | | |
| (In Thousands of Dollars) | | Cost | | | Gains | | | Losses | | | Fair Value | |
| December 31, 2024 | | | | | | | | | | | | | | | | |
| U.S. Treasury and U.S. government sponsored entities | | $ | 132,292 | | | $ | 0 | | | $ | (17,185 | ) | | $ | 115,107 | |
| State and political subdivisions | | | 609,950 | | | | 1,294 | | | | (106,364 | ) | | | 504,880 | |
| Corporate bonds | | | 17,849 | | | | 172 | | | | (573 | ) | | | 17,448 | |
| Mortgage-backed securities | | | 605,350 | | | | 34 | | | | (112,517 | ) | | | 492,867 | |
| Collateralized mortgage obligations | | | 142,525 | | | | 85 | | | | (8,834 | ) | | | 133,776 | |
| Small Business Administration | | | 2,715 | | | | 0 | | | | (240 | ) | | | 2,475 | |
| Totals | | $ | 1,510,681 | | | $ | 1,585 | | | $ | (245,713 | ) | | $ | 1,266,553 | |
|
| Gain (Loss) on Securities [Table Text Block] |
| | | Three Months Ended | | | Six Months Ended | |
| | | June 30, | | | June 30, | |
| (In Thousands of Dollars) | | 2025 | | | 2024 | | | 2025 | | | 2024 | |
| Proceeds | | $ | 0 | | | $ | 464 | | | $ | 23,901 | | | $ | 44,756 | |
| Gross gains | | | 0 | | | | 0 | | | | 0 | | | | 17 | |
| Gross losses | | | 0 | | | | (125 | ) | | | (1,334 | ) | | | (2,276 | ) |
|
| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | | June 30, 2025 | |
| (In Thousands of Dollars) | | Amortized Cost | | | Fair Value | |
| Maturity | | | | | | | | |
| Within one year | | $ | 3,493 | | | $ | 3,485 | |
| One to five years | | | 56,426 | | | | 51,968 | |
| Five to ten years | | | 176,719 | | | | 161,858 | |
| Beyond ten years | | | 496,424 | | | | 395,201 | |
| Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities | | | 764,867 | | | | 662,387 | |
| Total | | $ | 1,497,929 | | | $ | 1,274,899 | |
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
| | | Less than 12 Months | | | 12 Months or Longer | | | Total | |
| | | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | |
| (In Thousands of Dollars) | | Value | | | Loss | | | Value | | | Loss | | | Value | | | Loss | |
| June 30, 2025 | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | |
| U.S. Treasury and U.S. government sponsored entities | | $ | 1,045 | | | $ | (13 | ) | | $ | 107,303 | | | $ | (11,832 | ) | | $ | 108,348 | | | $ | (11,845 | ) |
| State and political subdivisions | | | 36,417 | | | | (2,310 | ) | | | 412,515 | | | | (107,337 | ) | | | 448,932 | | | | (109,647 | ) |
| Corporate bonds | | | 3,724 | | | | (42 | ) | | | 8,415 | | | | (462 | ) | | | 12,139 | | | | (504 | ) |
| Mortgage-backed securities | | | 9,399 | | | | (79 | ) | | | 452,400 | | | | (96,667 | ) | | | 461,799 | | | | (96,746 | ) |
| Collateralized mortgage obligations | | | 67,299 | | | | (797 | ) | | | 51,047 | | | | (5,587 | ) | | | 118,346 | | | | (6,384 | ) |
| Small Business Administration | | | 0 | | | | 0 | | | | 2,273 | | | | (182 | ) | | | 2,273 | | | | (182 | ) |
| Total | | $ | 117,884 | | | $ | (3,241 | ) | | $ | 1,033,953 | | | $ | (222,067 | ) | | $ | 1,151,837 | | | $ | (225,308 | ) |
| | | Less than 12 Months | | | 12 Months or Longer | | | Total | |
| | | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | |
| (In Thousands of Dollars) | | Value | | | Loss | | | Value | | | Loss | | | Value | | | Loss | |
| December 31, 2024 | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | |
| U.S. Treasury and U.S. government sponsored entities | | $ | 4,592 | | | $ | (320 | ) | | $ | 110,515 | | | $ | (16,865 | ) | | $ | 115,107 | | | $ | (17,185 | ) |
| State and political subdivisions | | | 66,436 | | | | (4,946 | ) | | | 400,911 | | | | (101,418 | ) | | | 467,347 | | | | (106,364 | ) |
| Corporate bonds | | | 4,303 | | | | (146 | ) | | | 8,568 | | | | (427 | ) | | | 12,871 | | | | (573 | ) |
| Mortgage-backed securities | | | 30,143 | | | | (365 | ) | | | 460,172 | | | | (112,152 | ) | | | 490,315 | | | | (112,517 | ) |
| Collateralized mortgage obligations | | | 65,046 | | | | (2,210 | ) | | | 51,405 | | | | (6,624 | ) | | | 116,451 | | | | (8,834 | ) |
| Small Business Administration | | | 0 | | | | 0 | | | | 2,475 | | | | (240 | ) | | | 2,475 | | | | (240 | ) |
| Total | | $ | 170,520 | | | $ | (7,987 | ) | | $ | 1,034,046 | | | $ | (237,726 | ) | | $ | 1,204,566 | | | $ | (245,713 | ) |
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