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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Less than 12 months, estimated fair value $ 603,352 $ 417,733
Less than 12 months, unrealized losses (32,528) (6,174)
12 months or more, estimated fair value 100,318 10,085
12 months or more, unrealized losses (9,459) (329)
Total estimated fair value 703,670 427,818
Total unrealized losses (41,987) (6,503)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 181,570 163,206
Less than 12 months, unrealized losses (10,962) (2,083)
12 months or more, estimated fair value 11,487 0
12 months or more, unrealized losses (924) 0
Total estimated fair value 193,057 163,206
Total unrealized losses (11,886) (2,083)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 77,732 30,647
Less than 12 months, unrealized losses (3,006) (570)
12 months or more, estimated fair value 15,671 5,836
12 months or more, unrealized losses (1,438) (182)
Total estimated fair value 93,403 36,483
Total unrealized losses (4,444) (752)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than 12 months, estimated fair value 82,105 92,192
Less than 12 months, unrealized losses (4,063) (1,580)
12 months or more, estimated fair value 51,997 2,524
12 months or more, unrealized losses (4,853) (90)
Total estimated fair value 134,102 94,716
Total unrealized losses (8,916) (1,670)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 218,589 115,204
Less than 12 months, unrealized losses (11,894) (1,667)
12 months or more, estimated fair value 19,703 1,725
12 months or more, unrealized losses (2,070) (57)
Total estimated fair value 238,292 116,929
Total unrealized losses (13,964) (1,724)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 43,356 16,484
Less than 12 months, unrealized losses (2,603) (274)
12 months or more, estimated fair value 1,460 0
12 months or more, unrealized losses (174) 0
Total estimated fair value 44,816 16,484
Total unrealized losses $ (2,777) $ (274)