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Note 3 - Securities - Securities in a Continuous Loss Position (Details)
Pure in Thousands, $ in Thousands
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Number of Securities 164 199
Less than 12 months, fair value $ 49,769 $ 52,079
Less than 12 months, unrealized loss (286) (465)
12 months or more, fair value 301,971 336,756
12 months or more, unrealized loss (23,804) (29,679)
U.S. agencies 351,740 388,835
U.S. agencies $ (24,090) $ (30,144)
US Government Agencies Debt Securities [Member]    
Number of Securities 37 51
Less than 12 months, fair value $ 4,966 $ 190
Less than 12 months, unrealized loss (119) (3)
12 months or more, fair value 57,899 79,556
12 months or more, unrealized loss (2,987) (4,427)
U.S. agencies 62,865 79,746
U.S. agencies $ (3,106) $ (4,430)
Collateralized Mortgage Obligations [Member]    
Number of Securities 6 6
Less than 12 months, fair value $ 8,286 $ 4,791
Less than 12 months, unrealized loss (7) (1)
12 months or more, fair value 3,568 3,873
12 months or more, unrealized loss (348) (443)
U.S. agencies 11,854 8,664
U.S. agencies $ (355) $ (444)
US States and Political Subdivisions Debt Securities [Member]    
Number of Securities 93 106
Less than 12 months, fair value $ 28,246 $ 44,859
Less than 12 months, unrealized loss (139) (453)
12 months or more, fair value 183,696 178,812
12 months or more, unrealized loss (17,383) (19,412)
U.S. agencies 211,942 223,671
U.S. agencies $ (17,522) $ (19,865)
SBA Pool [Member]    
Number of Securities 3 4
Less than 12 months, fair value $ 128 $ 116
Less than 12 months, unrealized loss 0 0
12 months or more, fair value 160 472
12 months or more, unrealized loss (1) (2)
U.S. agencies 288 588
U.S. agencies $ (1) $ (2)
Corporate Debt Securities [Member]    
Number of Securities 11 13
Less than 12 months, fair value $ 0 $ 0
Less than 12 months, unrealized loss 0 0
12 months or more, fair value 39,023 41,508
12 months or more, unrealized loss (2,477) (3,992)
U.S. agencies 39,023 41,508
U.S. agencies $ (2,477) $ (3,992)
Asset-Backed Securities [Member]    
Number of Securities 14 19
Less than 12 months, fair value $ 8,143 $ 2,123
Less than 12 months, unrealized loss (21) (8)
12 months or more, fair value 17,625 32,535
12 months or more, unrealized loss (608) (1,403)
U.S. agencies 25,768 34,658
U.S. agencies $ (629) $ (1,411)