Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details)

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Note 4 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Estimated fair value, less than 12 months $ 3,663 $ 0
Unrealized losses, less than 12 months (58) 0
Estimated fair value, 12 months or longer 346,364 362,299
Unrealized losses, 12 months or longer (63,407) (67,963)
Estimated fair value, total 350,027 362,299
Unrealized losses, total $ (63,465) $ (67,963)
percentage 100.00% 97.60%
Number of securities, unrealized losses, less than 12 months 0 0
Number of securities, unrealized losses, 12 months or longer 416 434
Number of securitiesunrealized losses, total 416 434
US Government-sponsored Enterprises Debt Securities [Member]    
Estimated fair value, less than 12 months $ 0 $ 0
Unrealized losses, less than 12 months 0 0
Estimated fair value, 12 months or longer 8,168 7,883
Unrealized losses, 12 months or longer (716) (1,001)
Estimated fair value, total 8,168 7,883
Unrealized losses, total $ (716) $ (1,001)
percentage 100.00% 100.00%
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member]    
Estimated fair value, less than 12 months $ 0 $ 0
Unrealized losses, less than 12 months 0 0
Estimated fair value, 12 months or longer 116,547 123,464
Unrealized losses, 12 months or longer (22,362) (25,946)
Estimated fair value, total 116,547 123,464
Unrealized losses, total $ (22,362) $ (25,946)
percentage 100.00% 100.00%
US States and Political Subdivisions Debt Securities [Member]    
Estimated fair value, less than 12 months $ 3,663 $ 0
Unrealized losses, less than 12 months (58) 0
Estimated fair value, 12 months or longer 220,209 229,595
Unrealized losses, 12 months or longer (39,610) (40,203)
Estimated fair value, total 223,872 229,595
Unrealized losses, total $ (39,668) $ (40,203)
percentage 100.00% 96.20%
Collateralized Debt Obligations [Member]    
Estimated fair value, less than 12 months $ 0 $ 0
Unrealized losses, less than 12 months 0 0
Estimated fair value, 12 months or longer 1,440 1,357
Unrealized losses, 12 months or longer (719) (813)
Estimated fair value, total 1,440 1,357
Unrealized losses, total $ (719) $ (813)
percentage 100.00% 100.00%