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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Less than 12 months, estimated fair value $ 73,065 $ 406,076
Less than 12 months, unrealized losses (2,058) (31,483)
12 months or more, estimated fair value 675,635 367,850
12 months or more, unrealized losses (73,627) (52,117)
Total estimated fair value 748,700 773,926
Total unrealized losses (75,685) (83,600)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 3,901 57,882
Less than 12 months, unrealized losses (56) (3,960)
12 months or more, estimated fair value 200,255 147,215
12 months or more, unrealized losses (17,835) (15,508)
Total estimated fair value 204,156 205,097
Total unrealized losses (17,891) (19,468)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 6,830 61,821
Less than 12 months, unrealized losses (186) (4,293)
12 months or more, estimated fair value 93,144 38,492
12 months or more, unrealized losses (8,583) (5,148)
Total estimated fair value 99,974 100,313
Total unrealized losses (8,769) (9,441)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than 12 months, estimated fair value 2,212 45,440
Less than 12 months, unrealized losses (79) (4,393)
12 months or more, estimated fair value 106,525 70,854
12 months or more, unrealized losses (15,351) (12,075)
Total estimated fair value 108,737 116,294
Total unrealized losses (15,430) (16,468)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 49,104 181,640
Less than 12 months, unrealized losses (1,366) (14,556)
12 months or more, estimated fair value 216,949 97,907
12 months or more, unrealized losses (25,794) (16,647)
Total estimated fair value 266,053 279,547
Total unrealized losses (27,160) (31,203)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 11,018 59,293
Less than 12 months, unrealized losses (371) (4,281)
12 months or more, estimated fair value 58,762 13,382
12 months or more, unrealized losses (6,064) (2,739)
Total estimated fair value 69,780 72,675
Total unrealized losses $ (6,435) $ (7,020)