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
Mar. 31, 2024
Dec. 31, 2023
Estimated fair value, less than 12 months $ 0 $ 0
Unrealized losses, less than 12 months 0 0
Estimated fair value, 12 months or longer 345,401 362,299
Unrealized losses, 12 months or longer (74,086) (67,963)
Estimated fair value, total 345,401 362,299
Unrealized losses, total $ (74,086) $ (67,963)
percentage 99.80% 97.60%
Number of securities, unrealized losses, less than 12 months 0 0
Number of securities, unrealized losses, 12 months or longer 420 434
Number of securitiesunrealized losses, total 420 434
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 7,866 7,883
Unrealized losses, 12 months or longer (1,018) (1,001)
Estimated fair value, total 7,866 7,883
Unrealized losses, total $ (1,018) $ (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 117,897 123,464
Unrealized losses, 12 months or longer (27,180) (25,946)
Estimated fair value, total 117,897 123,464
Unrealized losses, total $ (27,180) $ (25,946)
percentage 100.00% 100.00%
US States and Political Subdivisions 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 218,196 229,595
Unrealized losses, 12 months or longer (45,164) (40,203)
Estimated fair value, total 218,196 229,595
Unrealized losses, total $ (45,164) $ (40,203)
percentage 99.60% 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 1,442 1,357
Unrealized losses, 12 months or longer (724) (813)
Estimated fair value, total 1,442 1,357
Unrealized losses, total $ (724) $ (813)
percentage 100.00% 100.00%