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Note 6 - Investments and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Less than Twelve Months, Fair Value $ 9,193 $ 2,575
Less than Twelve Months, Gross Unrealized Losses (392) (17)
Twelve Months or Greater, Fair Value 137,681 141,556
Twelve Months or Greater, Gross Unrealized Losses (20,690) (20,573)
Total, Fair Value 146,874 144,131
Total, Gross Unrealized Losses (21,082) (20,590)
Less than Twelve Months, Fair Value 9,193 2,575
Less than Twelve Months, Gross Unrealized Losses (392) (17)
Twelve Months or Greater, Fair Value 137,681 141,556
Twelve Months or Greater, Gross Unrealized Losses (20,690) (20,573)
Total, Fair Value 146,874 144,131
Total, Gross Unrealized Losses (21,082) (20,590)
Subordinated Debt Securities [Member]    
Less than Twelve Months, Fair Value 2,812 994
Less than Twelve Months, Gross Unrealized Losses (238) (6)
Twelve Months or Greater, Fair Value 27,105 29,356
Twelve Months or Greater, Gross Unrealized Losses (1,645) (2,445)
Total, Fair Value 29,917 30,350
Total, Gross Unrealized Losses (1,883) (2,451)
Less than Twelve Months, Fair Value 2,812 994
Less than Twelve Months, Gross Unrealized Losses (238) (6)
Twelve Months or Greater, Fair Value 27,105 29,356
Twelve Months or Greater, Gross Unrealized Losses (1,645) (2,445)
Total, Fair Value 29,917 30,350
Total, Gross Unrealized Losses (1,883) (2,451)
Nontaxable Municipal Bonds [Member]    
Less than Twelve Months, Fair Value 6,381 1,386
Less than Twelve Months, Gross Unrealized Losses (154) (10)
Twelve Months or Greater, Fair Value 105,040 106,078
Twelve Months or Greater, Gross Unrealized Losses (18,550) (17,482)
Total, Fair Value 111,421 107,464
Total, Gross Unrealized Losses (18,704) (17,492)
Less than Twelve Months, Fair Value 6,381 1,386
Less than Twelve Months, Gross Unrealized Losses (154) (10)
Twelve Months or Greater, Fair Value 105,040 106,078
Twelve Months or Greater, Gross Unrealized Losses (18,550) (17,482)
Total, Fair Value 111,421 107,464
Total, Gross Unrealized Losses (18,704) (17,492)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than Twelve Months, Fair Value 0 195
Less than Twelve Months, Gross Unrealized Losses 0 (1)
Twelve Months or Greater, Fair Value 5,536 6,122
Twelve Months or Greater, Gross Unrealized Losses (495) (646)
Total, Fair Value 5,536 6,317
Total, Gross Unrealized Losses (495) (647)
Less than Twelve Months, Fair Value 0 195
Less than Twelve Months, Gross Unrealized Losses 0 (1)
Twelve Months or Greater, Fair Value 5,536 6,122
Twelve Months or Greater, Gross Unrealized Losses (495) (646)
Total, Fair Value 5,536 6,317
Total, Gross Unrealized Losses $ (495) $ (647)