Note 9 - Investments (Tables)
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9 Months Ended |
Sep. 30, 2026 |
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| Notes Tables |
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| Investment [Table Text Block] |
| | September 30, 2026 | |
| | Amortized Cost | | | Gross Unrealized Gains | | | Gross Unrealized Losses | | | Allowance for Credit Losses | | | Estimated Fair Value | |
Available-for-sale | | | | | | | | | | | | | | | | | | | | |
U.S. government agencies | | $ | 24,370 | | | $ | — | | | $ | (1,692 | ) | | $ | — | | | $ | 22,678 | |
Mortgage-backed securities | | | 289,270 | | | | — | | | | (16,936 | ) | | | — | | | | 272,334 | |
State and political subdivisions | | | 59,563 | | | | 29 | | | | (12,081 | ) | | | — | | | | 47,511 | |
Corporate bonds | | | 87,379 | | | | 69 | | | | (3,612 | ) | | | — | | | | 83,836 | |
Collateralized loan obligations | | | 158,422 | | | | 190 | | | | (74 | ) | | | — | | | | 158,538 | |
Total available-for-sale securities | | $ | 619,004 | | | $ | 288 | | | $ | (34,395 | ) | | $ | — | | | $ | 584,897 | |
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| | Amortized Cost | | | Gross Unrecognized Gains | | | Gross Unrecognized Losses | | | Estimated Fair Value | | | Allowance for Credit Losses | |
Held-to-maturity | | | | | | | | | | | | | | | | | | | | |
U.S. government agencies | | $ | 4,161 | | | $ | — | | | $ | (638 | ) | | $ | 3,523 | | | $ | — | |
Mortgage-backed securities | | | 104,151 | | | | — | | | | (12,904 | ) | | | 91,247 | | | | — | |
State and political subdivisions | | | 169,279 | | | | 1 | | | | (16,555 | ) | | | 152,725 | | | | (14 | ) |
Total held-to-maturity securities | | $ | 277,591 | | | $ | 1 | | | $ | (30,097 | ) | | $ | 247,495 | | | $ | (14 | ) |
| | December 31, 2025 | |
| | Amortized
Cost | | | Gross
Unrealized
Gains | | | Gross
Unrealized
Losses | | | Allowance for Credit Losses | | | Estimated Fair
Value | |
Available-for-sale | | | | | | | | | | | | | | | | | | | | |
U.S. government agencies | | $ | 33,000 | | | $ | 35 | | | $ | (134 | ) | | $ | — | | | $ | 32,901 | |
Mortgage-backed securities | | | 259,386 | | | | 2,491 | | | | (2,117 | ) | | | — | | | | 259,760 | |
State and political subdivisions | | | 52,610 | | | | 68 | | | | (5,757 | ) | | | — | | | | 46,921 | |
Corporate bonds | | | 90,114 | | | | 293 | | | | (3,940 | ) | | | — | | | | 86,467 | |
Collateralized loan obligations | | | 198,968 | | | | 364 | | | | (51 | ) | | | — | | | | 199,281 | |
Total available-for-sale securities | | $ | 634,078 | | | $ | 3,251 | | | $ | (11,999 | ) | | $ | — | | | $ | 625,330 | |
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| | Amortized
Cost | | | Gross
Unrecognized
Gains | | | Gross
Unrecognized
Losses | | | Estimated Fair
Value | | | Allowance for Credit Losses | |
Held-to-maturity | | | | | | | | | | | | | | | | | | | | |
U.S. government agencies | | $ | 4,523 | | | $ | — | | | $ | (413 | ) | | $ | 4,110 | | | $ | — | |
Mortgage-backed securities | | | 115,228 | | | | 20 | | | | (7,002 | ) | | | 108,246 | | | | — | |
State and political subdivisions | | | 171,075 | | | | 3,030 | | | | — | | | | 174,105 | | | | (15 | ) |
Total held-to-maturity securities | | $ | 290,826 | | | $ | 3,050 | | | $ | (7,415 | ) | | $ | 286,461 | | | $ | (15 | ) |
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| Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block] |
| | Held-To-Maturity | |
| | September 30, 2026 | | | December 31, 2025 | |
State and political subdivisions | | | | | | | | |
AAA/Aaa | | $ | 60,869 | | | $ | 59,367 | |
AA/Aa | | | 105,027 | | | | 110,255 | |
A/A2 | | | 2,435 | | | | 523 | |
Not rated | | | 948 | | | | 930 | |
Total | | $ | 169,279 | | | $ | 171,075 | |
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| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
| | | | | | September 30, 2026 | |
| | | | | | Less than twelve months | | | Twelve months or more | | | Total | |
| | Number of Securities | | | Gross Unrealized Losses | | | Fair Value | | | Gross Unrealized Losses | | | Fair Value | | | Gross Unrealized Losses | | | Fair Value | |
Available-for-sale | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
U.S. government agencies | | | 7 | | | $ | (937 | ) | | $ | 15,933 | | | $ | (755 | ) | | $ | 6,745 | | | $ | (1,692 | ) | | $ | 22,678 | |
Mortgage-backed securities | | | 153 | | | | (14,064 | ) | | | 240,133 | | | | (2,872 | ) | | | 23,391 | | | | (16,936 | ) | | | 263,524 | |
State and political subdivisions | | | 66 | | | | (1,990 | ) | | | 17,655 | | | | (10,091 | ) | | | 31,311 | | | | (12,081 | ) | | | 48,966 | |
Corporate bonds | | | 84 | | | | (1,121 | ) | | | 33,595 | | | | (2,491 | ) | | | 40,220 | | | | (3,612 | ) | | | 73,815 | |
Collateralized loan obligations | | | 9 | | | | (62 | ) | | | 67,937 | | | | (12 | ) | | | 9,988 | | | | (74 | ) | | | 77,925 | |
Total available-for-sale | | | 319 | | | $ | (18,174 | ) | | $ | 375,253 | | | $ | (16,221 | ) | | $ | 111,655 | | | $ | (34,395 | ) | | $ | 486,908 | |
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| | | | | | December 31, 2025 | |
| | | | | | Less than twelve months | | | Twelve months or more | | | Total | |
| | Number of Securities | | | Gross Unrealized Losses | | | Fair Value | | | Gross Unrealized Losses | | | Fair Value | | | Gross Unrealized Losses | | | Fair Value | |
Available-for-sale | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
U.S. government agencies | | | 5 | | | $ | (10 | ) | | $ | 5,990 | | | $ | (124 | ) | | $ | 14,375 | | | $ | (134 | ) | | $ | 20,365 | |
Mortgage-backed securities | | | 72 | | | | (755 | ) | | | 92,185 | | | | (1,362 | ) | | | 28,712 | | | | (2,117 | ) | | | 120,897 | |
State and political subdivisions | | | 51 | | | | (14 | ) | | | 1,481 | | | | (5,743 | ) | | | 37,029 | | | | (5,757 | ) | | | 38,510 | |
Corporate bonds | | | 70 | | | | (483 | ) | | | 25,381 | | | | (3,457 | ) | | | 41,993 | | | | (3,940 | ) | | | 67,374 | |
Collateralized loan obligations | | | 7 | | | | (51 | ) | | | 59,209 | | | | — | | | | — | | | | (51 | ) | | | 59,209 | |
Total available-for-sale | | | 205 | | | $ | (1,313 | ) | | $ | 184,246 | | | $ | (10,686 | ) | | $ | 122,109 | | | $ | (11,999 | ) | | $ | 306,355 | |
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| Realized Gain (Loss) on Investments [Table Text Block] |
| | Three months ended September 30, | | | Nine months ended September 30, | |
| | 2026 | | | 2025 | | | 2026 | | | 2025 | |
Proceeds from sales, calls and maturities of securities available for sale | | $ | 4,450 | | | $ | 22,490 | | | $ | 27,714 | | | $ | 33,490 | |
Gross gains on sales, calls and maturities of securities available for sale | | | — | | | | — | | | | — | | | | 124 | |
Gross losses on sales, calls and maturities of securities available for sale | | | — | | | | — | | | | — | | | | — | |
Net gain (loss) on sale of securities available for sale | | $ | — | | | $ | — | | | $ | — | | | $ | 124 | |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | September 30, 2026 | |
| | Available-for-Sale | | | Held-to-Maturity | |
| | Amortized Cost | | | Fair Value | | | Amortized Cost | | | Fair Value | |
Maturing within one year | | $ | 440 | | | $ | 440 | | | $ | - | | | $ | - | |
Maturing after one year through five years | | | 12,786 | | | | 12,500 | | | | 7,490 | | | | 7,154 | |
Maturing after five years through ten years | | | 92,440 | | | | 87,651 | | | | 16,231 | | | | 14,510 | |
Maturing after ten years | | | 65,646 | | | | 53,434 | | | | 149,719 | | | | 134,584 | |
Securities not due at a single maturity date: | | | | | | | | | | | | | | | | |
Mortgage-backed securities | | | 289,270 | | | | 272,334 | | | | 104,151 | | | | 91,247 | |
Collateralized loan obligations | | | 158,422 | | | | 158,538 | | | | — | | | | — | |
Total | | $ | 619,004 | | | $ | 584,897 | | | $ | 277,591 | | | $ | 247,495 | |
| | December 31, 2025 | |
| | Available-for-Sale | | | Held-to-Maturity | |
| | Amortized Cost | | | Fair Value | | | Amortized Cost | | | Fair Value | |
Maturing within one year | | $ | 10,285 | | | $ | 10,320 | | | $ | 824 | | | $ | 825 | |
Maturing after one year through five years | | | 19,667 | | | | 19,907 | | | | 5,014 | | | | 4,902 | |
Maturing after five years through ten years | | | 82,725 | | | | 78,553 | | | | 17,806 | | | | 17,020 | |
Maturing after ten years | | | 63,047 | | | | 57,509 | | | | 151,954 | | | | 155,468 | |
Securities not due at a single maturity date: | | | | | | | | | | | | | | | | |
Mortgage-backed securities | | | 259,386 | | | | 259,760 | | | | 115,228 | | | | 108,246 | |
Collateralized loan obligations | | | 198,968 | | | | 199,281 | | | | — | | | | — | |
Total | | $ | 634,078 | | | $ | 625,330 | | | $ | 290,826 | | | $ | 286,461 | |
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