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Note 6 - Investments and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Less than Twelve Months, Fair Value $ 27,469 $ 2,575
Less than Twelve Months, Gross Unrealized Losses (664) (17)
Twelve Months or Greater, Fair Value 129,480 141,556
Twelve Months or Greater, Gross Unrealized Losses (24,055) (20,573)
Total, Fair Value 156,949 144,131
Total, Gross Unrealized Losses (24,719) (20,590)
Less than Twelve Months, Fair Value 27,469 2,575
Less than Twelve Months, Gross Unrealized Losses (664) (17)
Twelve Months or Greater, Fair Value 129,480 141,556
Twelve Months or Greater, Gross Unrealized Losses (24,055) (20,573)
Total, Fair Value 156,949 144,131
Total, Gross Unrealized Losses (24,719) (20,590)
Subordinated Debt Securities [Member]    
Less than Twelve Months, Fair Value 10,376 994
Less than Twelve Months, Gross Unrealized Losses (374) (6)
Twelve Months or Greater, Fair Value 20,496 29,356
Twelve Months or Greater, Gross Unrealized Losses (2,053) (2,445)
Total, Fair Value 30,872 30,350
Total, Gross Unrealized Losses (2,427) (2,451)
Less than Twelve Months, Fair Value 10,376 994
Less than Twelve Months, Gross Unrealized Losses (374) (6)
Twelve Months or Greater, Fair Value 20,496 29,356
Twelve Months or Greater, Gross Unrealized Losses (2,053) (2,445)
Total, Fair Value 30,872 30,350
Total, Gross Unrealized Losses (2,427) (2,451)
Nontaxable Municipal Bonds [Member]    
Less than Twelve Months, Fair Value 17,093 1,386
Less than Twelve Months, Gross Unrealized Losses (290) (10)
Twelve Months or Greater, Fair Value 103,085 106,078
Twelve Months or Greater, Gross Unrealized Losses (21,283) (17,482)
Total, Fair Value 120,178 107,464
Total, Gross Unrealized Losses (21,573) (17,492)
Less than Twelve Months, Fair Value 17,093 1,386
Less than Twelve Months, Gross Unrealized Losses (290) (10)
Twelve Months or Greater, Fair Value 103,085 106,078
Twelve Months or Greater, Gross Unrealized Losses (21,283) (17,482)
Total, Fair Value 120,178 107,464
Total, Gross Unrealized Losses (21,573) (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 5,899 6,122
Twelve Months or Greater, Gross Unrealized Losses (719) (646)
Total, Fair Value 5,899 6,317
Total, Gross Unrealized Losses (719) (647)
Less than Twelve Months, Fair Value 0 195
Less than Twelve Months, Gross Unrealized Losses 0 (1)
Twelve Months or Greater, Fair Value 5,899 6,122
Twelve Months or Greater, Gross Unrealized Losses (719) (646)
Total, Fair Value 5,899 6,317
Total, Gross Unrealized Losses $ (719) $ (647)