Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details)

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Note 6 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Estimated fair value, less than 12 months $ 12,529 $ 204,281
Unrealized losses, less than 12 months (1,185) (40,890)
Estimated fair value, 12 months or longer 326,751 163,050
Unrealized losses, 12 months or longer (102,546) (43,698)
Estimated fair value, total 339,280 367,331
Unrealized losses, total $ (103,731) $ (84,588)
percentage 100.00% 99.00%
Number of securities, unrealized losses, less than 12 months 20 311
Number of securities, unrealized losses, 12 months or longer 425 135
Number of securitiesunrealized losses, total 445 446
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 7,550 7,625
Unrealized losses, 12 months or longer (1,333) (1,258)
Estimated fair value, total 7,550 7,625
Unrealized losses, total $ (1,333) $ (1,258)
percentage 100.00% 100.00%
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member]    
Estimated fair value, less than 12 months $ 0 $ 32,700
Unrealized losses, less than 12 months 0 (4,955)
Estimated fair value, 12 months or longer 119,096 101,416
Unrealized losses, 12 months or longer (33,022) (23,929)
Estimated fair value, total 119,096 134,116
Unrealized losses, total $ (33,022) $ (28,884)
percentage 100.00% 100.00%
US States and Political Subdivisions Debt Securities [Member]    
Estimated fair value, less than 12 months $ 12,529 $ 171,581
Unrealized losses, less than 12 months (1,185) (35,935)
Estimated fair value, 12 months or longer 198,950 52,961
Unrealized losses, 12 months or longer (67,173) (17,386)
Estimated fair value, total 211,479 224,542
Unrealized losses, total $ (68,358) $ (53,321)
percentage 100.00% 98.60%
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 1,155 1,048
Unrealized losses, 12 months or longer (1,018) (1,125)
Estimated fair value, total 1,155 1,048
Unrealized losses, total $ (1,018) $ (1,125)
percentage 100.00% 100.00%