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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Less than 12 months, estimated fair value $ 689,885 $ 417,733
Less than 12 months, unrealized losses (53,160) (6,174)
12 months or more, estimated fair value 95,363 10,085
12 months or more, unrealized losses (13,050) (329)
Total estimated fair value 785,248 427,818
Total unrealized losses (66,210) (6,503)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 195,931 163,206
Less than 12 months, unrealized losses (14,887) (2,083)
12 months or more, estimated fair value 11,227 0
12 months or more, unrealized losses (1,161) 0
Total estimated fair value 207,158 163,206
Total unrealized losses (16,048) (2,083)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 94,147 30,647
Less than 12 months, unrealized losses (5,000) (570)
12 months or more, estimated fair value 15,295 5,836
12 months or more, unrealized losses (1,809) (182)
Total estimated fair value 109,442 36,483
Total unrealized losses (6,809) (752)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than 12 months, estimated fair value 81,207 92,192
Less than 12 months, unrealized losses (6,843) (1,580)
12 months or more, estimated fair value 48,176 2,524
12 months or more, unrealized losses (6,885) (90)
Total estimated fair value 129,383 94,716
Total unrealized losses (13,728) (1,670)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 248,471 115,204
Less than 12 months, unrealized losses (21,340) (1,667)
12 months or more, estimated fair value 19,269 1,725
12 months or more, unrealized losses (2,963) (57)
Total estimated fair value 267,740 116,929
Total unrealized losses (24,303) (1,724)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 70,129 16,484
Less than 12 months, unrealized losses (5,090) (274)
12 months or more, estimated fair value 1,396 0
12 months or more, unrealized losses (232) 0
Total estimated fair value 71,525 16,484
Total unrealized losses $ (5,322) $ (274)