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
Jun. 30, 2023
Dec. 31, 2022
Estimated fair value, less than 12 months $ 17,162 $ 204,281
Unrealized losses, less than 12 months (388) (40,890)
Estimated fair value, 12 months or longer 350,310 163,050
Unrealized losses, 12 months or longer (78,792) (43,698)
Estimated fair value, total 367,472 367,331
Unrealized losses, total $ (79,180) $ (84,588)
percentage 99.80% 99.00%
Number of securities, unrealized losses, less than 12 months 27 311
Number of securities, unrealized losses, 12 months or longer 420 135
Number of securitiesunrealized losses, total 447 446
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 7,673 7,625
Unrealized losses, 12 months or longer (1,210) (1,258)
Estimated fair value, total 7,673 7,625
Unrealized losses, total $ (1,210) $ (1,258)
percentage 100.00% 100.00%
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member]    
Estimated fair value, less than 12 months $ 3,063 $ 32,700
Unrealized losses, less than 12 months (166) (4,955)
Estimated fair value, 12 months or longer 124,598 101,416
Unrealized losses, 12 months or longer (28,132) (23,929)
Estimated fair value, total 127,661 134,116
Unrealized losses, total $ (28,298) $ (28,884)
percentage 100.00% 100.00%
US States and Political Subdivisions Debt Securities [Member]    
Estimated fair value, less than 12 months $ 14,099 $ 171,581
Unrealized losses, less than 12 months (222) (35,935)
Estimated fair value, 12 months or longer 216,964 52,961
Unrealized losses, 12 months or longer (48,352) (17,386)
Estimated fair value, total 231,063 224,542
Unrealized losses, total $ (48,574) $ (53,321)
percentage 99.80% 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 1,075 1,048
Unrealized losses, 12 months or longer (1,098) (1,125)
Estimated fair value, total 1,075 1,048
Unrealized losses, total $ (1,098) $ (1,125)
percentage 100.00% 100.00%