Note 3 - Securities (Tables)
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9 Months Ended |
Sep. 30, 2026 |
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| Notes Tables |
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| Debt Securities, Available-for-Sale [Table Text Block] |
| | | | | | Gross | | | Gross | | | | | |
| | Amortized | | | Unrealized | | | Unrealized | | | | | |
(In Thousands of Dollars) | | Cost | | | Gains | | | Losses | | | Fair Value | |
September 30, 2026 | | | | | | | | | | | | | | | | |
U.S. Treasury and U.S. government sponsored entities | | $ | 4,392 | | | $ | 0 | | | $ | (467 | ) | | $ | 3,925 | |
State and political subdivisions | | | 714,400 | | | | 45 | | | | (142,150 | ) | | | 572,295 | |
Corporate bonds | | | 25,914 | | | | 76 | | | | (587 | ) | | | 25,403 | |
Mortgage-backed securities | | | 680,844 | | | | 5 | | | | (115,404 | ) | | | 565,445 | |
Collateralized mortgage obligations | | | 253,065 | | | | 10 | | | | (18,223 | ) | | | 234,852 | |
Small Business Administration | | | 1,775 | | | | 0 | | | | (164 | ) | | | 1,611 | |
Totals | | $ | 1,680,390 | | | $ | 136 | | | $ | (276,995 | ) | | $ | 1,403,531 | |
| | | | | | Gross | | | Gross | | | | | |
| | Amortized | | | Unrealized | | | Unrealized | | | | | |
(In Thousands of Dollars) | | Cost | | | Gains | | | Losses | | | Fair Value | |
December 31, 2025 | | | | | | | | | | | | | | | | |
U.S. Treasury and U.S. government sponsored entities | | $ | 104,737 | | | $ | 45 | | | $ | (9,487 | ) | | $ | 95,295 | |
State and political subdivisions | | | 589,236 | | | | 2,632 | | | | (88,171 | ) | | | 503,697 | |
Corporate bonds | | | 13,171 | | | | 163 | | | | (289 | ) | | | 13,045 | |
Mortgage-backed securities | | | 629,376 | | | | 731 | | | | (82,973 | ) | | | 547,134 | |
Collateralized mortgage obligations | | | 186,494 | | | | 1,461 | | | | (5,739 | ) | | | 182,216 | |
Small Business Administration | | | 2,210 | | | | 0 | | | | (140 | ) | | | 2,070 | |
Totals | | $ | 1,525,224 | | | $ | 5,032 | | | $ | (186,799 | ) | | $ | 1,343,457 | |
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| Gain (Loss) on Securities [Table Text Block] |
| | Three Months Ended | | | Nine Months Ended | |
| | September 30, | | | September 30, | |
(In Thousands of Dollars) | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
Proceeds | | $ | 90,546 | | | $ | 28,750 | | | $ | 90,546 | | | $ | 52,651 | |
Gross gains | | | 0 | | | | 0 | | | | 0 | | | | 0 | |
Gross losses | | | (10,291 | ) | | | (960 | ) | | | (10,291 | ) | | | (2,294 | ) |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | September 30, 2026 | |
(In Thousands of Dollars) | | Amortized Cost | | | Fair Value | |
Maturity | | | | | | | | |
Within one year | | $ | 2,419 | | | $ | 2,432 | |
One to five years | | | 41,768 | | | | 40,033 | |
Five to ten years | | | 157,409 | | | | 137,549 | |
Beyond ten years | | | 543,110 | | | | 421,609 | |
Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities | | | 935,684 | | | | 801,908 | |
Total | | $ | 1,680,390 | | | $ | 1,403,531 | |
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| 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 | |
September 30, 2026 | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | |
U.S. Treasury and U.S. government sponsored entities | | $ | 1,952 | | | $ | (115 | ) | | $ | 1,973 | | | $ | (352 | ) | | $ | 3,925 | | | $ | (467 | ) |
State and political subdivisions | | | 198,399 | | | | (21,431 | ) | | | 367,200 | | | | (120,719 | ) | | | 565,599 | | | | (142,150 | ) |
Corporate bonds | | | 16,184 | | | | (389 | ) | | | 5,411 | | | | (198 | ) | | | 21,595 | | | | (587 | ) |
Mortgage-backed securities | | | 188,976 | | | | (13,280 | ) | | | 375,136 | | | | (102,124 | ) | | | 564,112 | | | | (115,404 | ) |
Collateralized mortgage obligations | | | 164,245 | | | | (11,226 | ) | | | 69,549 | | | | (6,997 | ) | | | 233,794 | | | | (18,223 | ) |
Small Business Administration | | | 0 | | | | 0 | | | | 1,611 | | | | (164 | ) | | | 1,611 | | | | (164 | ) |
Total | | $ | 569,756 | | | $ | (46,441 | ) | | $ | 820,880 | | | $ | (230,554 | ) | | $ | 1,390,636 | | | $ | (276,995 | ) |
| | 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, 2025 | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | |
U.S. Treasury and U.S. government sponsored entities | | $ | 100 | | | $ | 0 | | | $ | 93,211 | | | $ | (9,487 | ) | | $ | 93,311 | | | $ | (9,487 | ) |
State and political subdivisions | | | 6,302 | | | | (1,360 | ) | | | 432,053 | | | | (86,811 | ) | | | 438,355 | | | | (88,171 | ) |
Corporate bonds | | | 2,962 | | | | (44 | ) | | | 6,293 | | | | (245 | ) | | | 9,255 | | | | (289 | ) |
Mortgage-backed securities | | | 48,965 | | | | (313 | ) | | | 437,859 | | | | (82,660 | ) | | | 486,824 | | | | (82,973 | ) |
Collateralized mortgage obligations | | | 50,887 | | | | (621 | ) | | | 69,006 | | | | (5,118 | ) | | | 119,893 | | | | (5,739 | ) |
Small Business Administration | | | 0 | | | | 0 | | | | 2,070 | | | | (140 | ) | | | 2,070 | | | | (140 | ) |
Total | | $ | 109,216 | | | $ | (2,338 | ) | | $ | 1,040,492 | | | $ | (184,461 | ) | | $ | 1,149,708 | | | $ | (186,799 | ) |
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